UI Extension Mod Sims 4 (January 2026) Complete Guide

Updated by Rudra Sethi
November 2, 2025
GamingThe Sims 4

The UI Extension Mod for Sims 4 is a game-changing modification that revolutionizes how players interact with the game’s interface. Created by talented modder weerbesu, this mod enhances the base game’s user interface by adding informative panels, detailed statistics, and customization options that make gameplay more intuitive and enjoyable. Whether you’re a seasoned Simmer or new to the franchise, this comprehensive guide will walk you through everything you need to know about downloading, installing, and maximizing the potential of the UI Extension Mod in January 2026.

What is the UI Extension Mod?

The UI Extension Mod is a popular modification for The Sims 4 that enhances the game’s user interface by adding additional information panels, features, and customization options. Unlike other mods that add new gameplay elements, this mod focuses purely on improving how you interact with and view information within the existing game framework.

The mod doesn’t change the core gameplay mechanics but instead provides players with more detailed information about their Sims, relationships, skills, careers, and more. This allows for better decision-making and a deeper understanding of what’s happening in your Sims’ lives at any given moment.

Key Features of the UI Extension Mod

The UI Extension Mod comes packed with numerous features that enhance various aspects of the game. Here’s a comprehensive breakdown of what you can expect:

1. Enhanced Sim Information Panel

Detailed moodlets with exact time remaining
Hidden moodlets that aren’t normally visible
More precise emotion percentages
Current and scheduled activities displayed simultaneously
Additional needs information with exact values

2. Relationship Improvements

Detailed relationship panel showing exact friendship and romance percentages
Attraction system indicators
Historical relationship tracking
Relationship context (how Sims met, last interaction)
Social compatibility indicators

3. Skill Progression Details

Exact skill percentages instead of just level indicators
Time remaining until next skill level
Skill gain multipliers
Hidden skill information
Skill requirements for career advancement

4. Career and School Enhancements

Detailed performance metrics
Exact promotion requirements
Work performance indicators
School grade breakdowns
Promotion chance percentages

5. Build/Buy Mode Improvements

Advanced filtering options
Item information panels
Room value details
Building statistics
Custom catalog organization

6. CAS (Create a Sim) Additions

More detailed trait information
Personality trait compatibility indicators
Aspiration progress tracking
Additional CAS customization options

7. Time and Calendar Features

Detailed calendar view
Event countdowns
Seasonal information display
Historical event tracking

8. Inventory Management

Enhanced inventory organization
Item value information
Quick action buttons
Inventory search functionality

System Requirements

Before downloading and installing the UI Extension Mod, ensure your system meets these requirements:

Minimum Requirements:

The Sims 4 Base Game (latest version)
Windows/Mac operating system
At least 4GB RAM
2GB of free hard drive space

Recommended Requirements:

The Sims 4 Base Game (latest version)
Windows 10/11 or macOS 10.14 (Mojave) or later
8GB RAM or more
4GB of free hard drive space
Graphics card with at least 1GB VRAM

Compatibility Information:

Compatible with The Sims 4 version 1.108.335 (latest patch as of January 2026)
Works with all expansion, game, stuff, and kit packs
Compatible with most other UI mods (with proper load order)
Not compatible with older versions of the game

Download Links

To ensure you’re getting the official, virus-free version of the UI Extension Mod, download only from these verified sources:

Primary Download Source:

Official Download Page – weerbesu’s Tumblr (most up-to-date version)

Alternative Download Sources:

ModTheSims Download Page – Official ModTheSims page
Patreon Page – Support the creator and get early updates

File Information:

Latest Version: v1.69
File Size: Approximately 2.5MB
File Type: .package and .ts4script files
Last Updated: January 2026

Installation Guide

Follow these step-by-step instructions to properly install the UI Extension Mod:

Step 1: Backup Your Game

Before installing any mod, it’s crucial to backup your game files:

Navigate to Documents > Electronic Arts > The Sims 4
Copy the “saves” folder to a safe location
Copy the “mods” folder to a safe location (if you have one)
Copy the “tray” folder to a safe location (if you have custom content)

Step 2: Enable Mods in Your Game

Launch The Sims 4
Go to Game Options > Other
Check “Enable Custom Content and Mods”
Check “Script Mods Allowed”
Exit the game completely

Step 3: Download and Extract the Mod

Download the UI Extension Mod from one of the official sources listed above
Locate the downloaded file (usually in .zip or .rar format)
Right-click on the file and select “Extract All” or use a program like WinRAR or 7-Zip
Extract the contents to a temporary folder

Step 4: Install the Mod Files

Navigate to Documents > Electronic Arts > The Sims 4 > Mods
If you don’t have a “Mods” folder, create one
Create a new folder inside “Mods” called “UI Extension Mod” (this helps with organization)
Copy the extracted .package and .ts4script files into this new folder
Ensure the folder structure is correct: Documents > Electronic Arts > The Sims 4 > Mods > UI Extension Mod > [mod files]

Step 5: Verify Installation

Launch The Sims 4
On the main menu, look for a pop-up indicating that custom content has been detected
Start a new game or load an existing save
Check if the mod is working by looking for the new UI elements (such as the detailed moodlet information)

Configuration Options

The UI Extension Mod comes with various configuration options that allow you to customize your experience. Here’s how to access and modify these settings:

Accessing Configuration Settings:

Enter a household in live mode
Click on any Sim
Navigate to “UI Extension Mod” in the interaction menu
Select “Settings” to access the configuration options

Main Configuration Categories:

General Settings:

Toggle mod features on/off
Set notification preferences
Configure update checking
Adjust text size and transparency

Sim Information Panel:

Toggle detailed moodlets
Show/hide hidden moodlets
Configure need display format
Set up custom mood colors

Relationship Panel:

Toggle detailed relationship percentages
Show/hide attraction system
Configure relationship history tracking
Set up social compatibility indicators

Skill Information:

Toggle exact skill percentages
Show/hide skill gain multipliers
Configure skill progression notifications
Set up skill requirement displays

Career and School:

Toggle detailed performance metrics
Show/hide promotion requirements
Configure work performance indicators
Set up school grade breakdowns

Build/Buy Mode:

Toggle advanced filtering options
Configure item information panels
Set up room value details
Customize building statistics display

CAS Settings:

Toggle detailed trait information
Show/hide personality trait compatibility
Configure aspiration progress tracking
Set up additional CAS options

Time and Calendar:

Toggle detailed calendar view
Configure event countdowns
Set up seasonal information display
Customize historical event tracking

Inventory Management:

Toggle enhanced inventory organization
Configure item value information
Set up quick action buttons
Customize inventory search functionality

Feature Breakdown

Let’s dive deeper into each feature of the UI Extension Mod and how it enhances your gameplay:

Enhanced Sim Information Panel

The Sim Information Panel is one of the most useful features of the UI Extension Mod. It provides detailed information about your Sim’s current state that isn’t available in the base game:

Detailed Moodlets:

Exact time remaining for each moodlet (down to the minute)
Hidden moodlets that affect your Sim but aren’t normally visible
Moodlet strength indicators showing exactly how much each moodlet affects your Sim’s emotion
Customizable moodlet colors for easier identification

Needs Information:

Exact need values instead of just the colored bars
Need decay rates showing how quickly each need is decreasing
Need gain multipliers from various sources
Predictions for when needs will become critical

Activity Information:

Current activities with exact time remaining
Queued activities with start times
Activity conflicts and warnings
Activity efficiency indicators

Relationship Improvements

The relationship enhancements in the UI Extension Mod provide deeper insight into your Sim’s social connections:

Detailed Relationship Metrics:

Exact friendship and romance percentages (instead of just the colored bars)
Relationship decay rates showing how quickly relationships deteriorate without interaction
Relationship gain multipliers from traits, mood, and conversation topics
Historical relationship tracking showing how relationships have changed over time

Attraction System:

Physical attraction indicators based on appearance preferences
Personality compatibility scores
Lifestyle compatibility metrics
Turn-on/turn-off indicators

Social Context:

How Sims met and when
Last interaction details
Interaction history
Social milestone tracking

Skill Progression Details

The skill enhancements help you better understand and optimize your Sim’s skill development:

Exact Skill Information:

Precise skill percentages (e.g., 73.4% Cooking instead of just level 7)
Time remaining until next skill level
Skill gain rates showing how quickly skills are increasing
Skill decay rates for skills that decrease over time

Skill Requirements:

Detailed requirements for career advancement
Skill requirements for unlocking interactions
Skill synergy information showing how skills affect each other
Hidden skill requirements for special interactions

Skill Optimization:

Best activities for skill gain based on current mood and traits
Environmental factors affecting skill gain
Optimal skill building schedules
Skill plateau warnings

Career and School Enhancements

The career and school features provide valuable information for professional advancement:

Performance Metrics:

Exact performance percentages
Factors affecting performance (positive and negative)
Performance trends over time
Predictions for next performance review

Promotion Requirements:

Detailed breakdown of requirements for next promotion
Progress tracking for each requirement
Time estimates for meeting requirements
Alternative paths to promotion

Work/School Life:

Coworker/classmate relationship effects
Work/school event effectiveness
Special project progress tracking
Work/school stress indicators

Build/Buy Mode Improvements

The build/buy enhancements make creating and designing much more efficient:

Advanced Filtering:

Filter by multiple criteria simultaneously
Custom filter presets
Exclude by pack, category, or style
Search by item name or keyword

Item Information:

Detailed item statistics (comfort, environment, etc.)
Room contribution metrics
Item value appreciation/depreciation
Custom content identification

Building Statistics:

Room value breakdown
Lot value composition
Building efficiency metrics
Space utilization statistics

CAS Additions

The Create a Sim enhancements provide more information when creating or modifying Sims:

Trait Information:

Detailed trait descriptions and effects
Trait compatibility indicators
Trait combination effects
Hidden trait information

Personality Insights:

Personality type indicators
Aspiration compatibility
Lifestyle preferences
Life goal predictions

Customization Options:

Additional sliders for fine-tuning appearance
Color matching tools
Outfit organization features
Custom content integration

Compatibility with Other Mods

The UI Extension Mod is designed to work well with most other mods, but there are some important compatibility considerations:

Fully Compatible Mods:

MC Command Center
WickedWhims
Basemental Drugs
Slice of Life
Meaningful Stories
Have Some Personality Please
Private Practice
Realistic Reactions

Partially Compatible Mods (may require load order adjustments):

Better Exceptions
UI Cheats Extension
More Columns in CAS
Wider CAS Panel
New Game Options
SimDa Dating App

Incompatible Mods:

Older versions of UI mods that modify the same panels
Certain custom UI replacements
Some translation mods that override UI text

Load Order Recommendations:

Script mods (MC Command Center, etc.)
Core gameplay mods (Meaningful Stories, etc.)
UI Extension Mod
Other UI mods
Custom content

Update Process

Keeping your mods updated is crucial for compatibility with the latest game patches. Here’s how to update the UI Extension Mod:

Checking for Updates:

Visit the official download page periodically
Follow the creator on Tumblr or Patreon for update notifications
Check ModTheSims for new versions
Join Sims 4 modding communities for update news

Updating the Mod:

Remove the old version of the mod from your Mods folder
Download the latest version from an official source
Extract the new files
Place them in your Mods folder (replacing the old files)
Delete the localthumbcache.package file from your Sims 4 folder
Launch the game to verify the update

Troubleshooting Update Issues:

If the mod doesn’t work after updating, try a fresh install
Make sure you’ve removed all old files before installing the new version
Check for conflicts with other recently updated mods
Verify that your game version is compatible with the mod version

Uninstallation Guide

If you need to remove the UI Extension Mod for any reason, follow these steps:

Safe Uninstallation Process:

Remove the mod files from your Mods folder
Delete the localthumbcache.package file from your Sims 4 folder
Launch the game and load a save
Save the game without the mod installed
Exit the game completely

Important Notes:

Removing the mod won’t corrupt your saves
Some UI elements may appear different after removal
Any saves made with the mod will work fine without it
You don’t need to start a new game after removing the mod

Troubleshooting

Even with proper installation, you might encounter issues. Here’s a comprehensive troubleshooting guide:

Common Issues and Solutions:

Mod Not Working:

Verify that “Script Mods Allowed” is enabled in game options
Check that the mod files are no more than one folder deep in your Mods folder
Ensure you have the latest version of the mod
Delete the localthumbcache.package file and restart the game
Test the mod in a new save without other mods

Game Crashes:

Check for mod conflicts using the 50/50 method
Verify that your game version is compatible with the mod version
Remove outdated mods that might be conflicting
Repair your game through Origin/Steam/Epic Games Launcher
Update your graphics drivers

UI Elements Missing or Misaligned:

Check for UI conflicts with other mods
Adjust your game resolution
Reset UI settings through the mod’s configuration menu
Update your game to the latest version
Reinstall the mod

Performance Issues:

Reduce the number of active features in the mod’s settings
Lower your game’s graphics settings
Close background applications
Check if your computer meets the recommended requirements
Consider removing other resource-intensive mods

Error Messages:

Take a screenshot of the error message
Check the mod’s official page for known issues
Search for the error message in Sims 4 modding communities
Report the issue to the mod creator with details about your setup
Temporarily remove the mod if the error persists

Advanced Troubleshooting:

Using the 50/50 Method:

Remove all mods from your Mods folder
Add back half of your mods
Test the game
If the game works, add half of the remaining mods
If the game doesn’t work, remove half of the currently installed mods
Repeat this process until you identify the conflicting mod

Checking for LastException Files:

Navigate to Documents > Electronic Arts > The Sims 4
Look for files named “LastException.txt”
Open the most recent file in a text editor
Look for mentions of the UI Extension Mod
Search online for solutions to the specific errors mentioned

Settings Recommendations

While the UI Extension Mod is highly customizable, here are some recommended settings for different playstyles:

For Storytellers:

Enable detailed moodlets with time remaining
Turn on relationship history tracking
Enable attraction system indicators
Configure aspiration progress tracking
Turn on detailed relationship percentages

For Legacy Players:

Enable skill progression details
Turn on career performance metrics
Configure promotion requirement displays
Enable room value details in build/buy mode
Turn on historical event tracking

For Builders:

Enable advanced filtering options in build/buy mode
Turn on item information panels
Configure room value details
Enable building statistics display
Turn on custom catalog organization

For Challenge Players:

Enable exact skill percentages
Turn on need decay rates
Configure activity efficiency indicators
Enable skill plateau warnings
Turn on performance trend indicators

For Performance-Conscious Players:

Disable resource-intensive features like attraction system
Reduce update frequency for dynamic information
Disable historical tracking features
Turn off visual enhancements
Limit the number of simultaneous information panels

Known Conflicts

The UI Extension Mod may conflict with certain other mods. Here’s a list of known conflicts and how to resolve them:

Direct Conflicts:

Older UI mods: These modify the same UI elements and can cause conflicts. Solution: Update to the latest version or choose one mod over the other.
Certain translation mods: These override UI text and can conflict with the mod’s text modifications. Solution: Use translation mods specifically designed to work with UI Extension Mod.

Indirect Conflicts:

MC Command Center: When using certain features together, you may experience overlapping information. Solution: Configure each mod to avoid duplicate information display.
UI Cheats Extension: Both mods modify the UI, which can cause occasional conflicts. Solution: Adjust load order and disable overlapping features.

Patch-Related Conflicts:

Game updates: Major game patches may temporarily break the mod until it’s updated. Solution: Check for mod updates after each game patch and temporarily remove the mod if necessary.

Version History

Understanding the evolution of the UI Extension Mod can help you appreciate its development and know what features were added when:

v1.69 (Current – January 2026):

Added compatibility with the latest game patch
Improved performance and reduced memory usage
Added new configuration options for skill display
Fixed issues with relationship panel on high-resolution displays
Enhanced compatibility with other popular UI mods

v1.68 (February 2026):

Added attraction system indicators
Improved relationship history tracking
Enhanced skill progression display
Added new build/buy mode filtering options
Fixed compatibility issues with Growing Together expansion pack

v1.67 (December [cy-1]):

Added detailed career performance metrics
Enhanced school grade breakdowns
Improved inventory management features
Added new CAS customization options
Fixed issues with seasonal information display

v1.66 (October [cy-1]):

Added historical event tracking
Enhanced calendar view
Improved moodlet time display
Added new configuration options for need display
Fixed compatibility issues with High School Years expansion pack

v1.65 (August [cy-1]):

Added detailed relationship percentages
Enhanced skill gain multipliers display
Improved build/buy mode item information
Added new CAS trait information
Fixed issues with work performance indicators

Performance Impact

While the UI Extension Mod is generally well-optimized, it does have some performance impact:

Minimal Impact Features:

Sim Information Panel enhancements
Relationship percentage display
Skill progression details
Configuration menu access

Moderate Impact Features:

Attraction system indicators
Historical relationship tracking
Advanced build/buy filtering
Inventory search functionality

Significant Impact Features:

Real-time skill gain calculations
Detailed performance metrics
Historical event tracking
Multiple simultaneous information panels

Performance Optimization Tips:

Disable features you don’t use in the mod’s settings
Reduce update frequency for dynamic information
Limit the number of simultaneous information panels
Close background applications while playing
Consider upgrading your hardware if you consistently experience performance issues

Save Game Considerations

The UI Extension Mod is designed to be save-game friendly, but there are some considerations to keep in mind:

Save Game Compatibility:

The mod won’t corrupt your saves
Saves made with the mod will work without it
You can safely add or remove the mod from existing saves
The mod doesn’t add irreversible changes to your saves

Recommended Practices:

Backup your saves before installing any new mod
Test the mod in a new save before using it in your main save
Remove the mod before installing game updates
Save frequently when using new features for the first time
Keep track of which saves were made with the mod enabled

Potential Issues:

Information displayed by the mod won’t be visible if you remove the mod
Some features might not work correctly in very old saves
Complex saves with many mods might experience occasional conflicts

Multiplayer Implications

While The Sims 4 doesn’t have traditional multiplayer, there are some considerations for shared gameplay experiences:

Gallery Sharing:

Lots built with the mod’s enhanced features will work fine for others without the mod
Sims created with the mod’s additional CAS options will work for others
The mod doesn’t add custom content that would be missing when sharing

Save Sharing:

Saves shared with others will work regardless of whether they have the mod
Information displayed by the mod simply won’t appear for players without it
No special considerations needed when sharing saves

Let’s Play Considerations:

Viewers will see the enhanced UI if the content creator has the mod
The mod doesn’t add any gameplay advantages that would be considered cheating
Content creators should disclose their use of UI enhancement mods

Legal/TOS Considerations

When using mods for The Sims 4, it’s important to understand the legal and terms of service implications:

EA’s Stance on Mods:

EA generally allows the use of mods that don’t violate their terms of service
Mods that modify the game’s user interface are typically acceptable
Mods that enable cheating or exploit game mechanics may be against TOS
EA doesn’t provide technical support for modded games

Mod Creator Rights:

The UI Extension Mod is the intellectual property of its creator
Redistribution without permission is prohibited
Modifying the mod and claiming it as your own is prohibited
Using the mod’s code in other projects without permission is prohibited

User Responsibilities:

Use mods at your own risk
Respect the mod creator’s terms and conditions
Report bugs and issues to the mod creator
Don’t redistribute the mod without permission

Alternative Options

While the UI Extension Mod is one of the most comprehensive UI mods available, there are some alternatives you might consider:

Direct Alternatives:

UI Cheats Extension: Offers some similar features but focuses more on cheating functionality
More Columns in CAS: Enhances the CAS interface but doesn’t provide the same information display
Wider CAS Panel: Similar to More Columns in CAS but with a different approach

Complementary Mods:

MC Command Center: Adds comprehensive gameplay features that complement the UI enhancements
Better Exceptions: Helps identify mod conflicts that might affect UI mods
SimInfoHUD: Displays some similar information but in a different format

Feature-Specific Alternatives:

Relationship Panels: Mods that specifically enhance relationship information
Skill Information Mods: Mods that focus specifically on skill progression details
Career Enhancement Mods: Mods that provide detailed career information

Community Resources

The Sims 4 modding community is vibrant and supportive. Here are some valuable resources for UI Extension Mod users:

Official Resources:

Weerbesu’s Tumblr: The official source for updates and information
ModTheSims Page: Official download page and community discussion
Patreon Page: Support the creator and get early access to updates

Community Forums:

Official EA Forums: General Sims 4 discussion and modding support
ModTheSims Forums: Comprehensive modding community with tutorials and support
Reddit r/thesims and r/Sims4: Active communities for sharing and troubleshooting

Video Resources:

YouTube Tutorials: Visual guides for installation and configuration
Twitch Streams: Live gameplay with the mod in action
Creator Spotlights: Videos highlighting mod features and updates

Social Media:

Twitter/X: Follow the creator and community for real-time updates
Tumblr: Community posts featuring the mod in action
Discord Servers: Real-time chat and support from experienced users

FAQ

Is the UI Extension Mod safe to download and use?

Yes, the UI Extension Mod is safe to download and use when obtained from official sources. The mod has been used by thousands of players without security issues. However, always download from trusted sources like the creator’s official Tumblr page or ModTheSims to avoid malicious versions.

Does the UI Extension Mod work with the latest game patch?

As of January 2026, the UI Extension Mod is compatible with the latest Sims 4 patch (version 1.108.335). The mod creator regularly updates the mod to maintain compatibility with new patches. If you experience issues after a game update, check for a mod update.

Will the UI Extension Mod cause my game to lag?

The UI Extension Mod is generally well-optimized, but like all mods, it does have some performance impact. The impact varies depending on your computer specifications and which features you have enabled. If you experience lag, try disabling resource-intensive features in the mod’s settings.

Can I use the UI Extension Mod with other UI mods?

The UI Extension Mod is compatible with most other UI mods, but some conflicts may occur. To minimize conflicts, ensure you’re using the latest versions of all mods and adjust the load order if necessary. Some features may overlap with other UI mods, so you may need to disable duplicate features.

Do I need to start a new game to use the UI Extension Mod?

No, you don’t need to start a new game to use the UI Extension Mod. It works with existing saves and won’t cause any issues with your current households. Simply install the mod and load your existing save to see the enhanced UI features.

How do I know if the UI Extension Mod is working?

After installing the UI Extension Mod, you should see enhanced information in various UI panels. For example, moodlets will show exact time remaining, relationships will display exact percentages, and skills will show precise progress. If you don’t see these changes, verify that the mod is properly installed and that script mods are enabled in your game options.

Can I customize which features of the UI Extension Mod are active?

Yes, the UI Extension Mod is highly customizable. You can access the settings by clicking on a Sim and selecting “UI Extension Mod” > “Settings” from the interaction menu. From there, you can enable or disable specific features and adjust various display options.

What should I do if the UI Extension Mod stops working after a game update?

If the mod stops working after a game update, first check if there’s an updated version of the mod available. If not, you may need to temporarily remove the mod until the creator releases an update. Always remove mods before installing game updates to prevent potential conflicts.

Does the UI Extension Mod work on Mac?

Yes, the UI Extension Mod works on both Windows and Mac versions of The Sims 4. The installation process is the same for both platforms. However, Mac users may need to adjust their security settings to allow the mod files to run properly.

Will using the UI Extension Mod affect my ability to share creations or saves?

No, the UI Extension Mod won’t affect your ability to share lots, Sims, or saves through the Gallery or other means. The mod only enhances the display of information in your game and doesn’t add custom content that would be missing when others use your creations.

Conclusion

The UI Extension Mod for The Sims 4 is an essential tool for players who want more detailed information and greater control over their game interface. With its comprehensive features, customization options, and regular updates, it enhances the gameplay experience without fundamentally changing the game mechanics.

Whether you’re a storyteller looking for deeper insight into your Sims’ lives, a legacy player tracking generations of progress, a builder creating masterpieces, or a challenge player optimizing every aspect of gameplay, the UI Extension Mod has something to offer.

By following this comprehensive guide, you should be able to download, install, configure, and troubleshoot the UI Extension Mod with confidence. Remember to keep the mod updated, back up your saves regularly, and engage with the Sims 4 modding community for the best experience.

Happy Simming with your enhanced UI experience in January 2026.