sims3mods.com
The three to install first
| Mod | What it does | Where you see it |
|---|---|---|
| ErrorTrap | A core mod that catches and corrects data corruption that can make a save impossible to load. What it cannot fix it traps and logs, so the save still loads | Works silently. Reports are saved as ScriptError files in Documents\Electronic Arts\The Sims 3 |
| Overwatch | A periodic clean-up that corrects errors and removes junk that builds up during play | Adds an NRaas > Overwatch menu to City Hall and to the active Sim |
| MasterController | Lets you change almost anything about the Sims in town, with filters to find the Sims you want and act on them | NRaas menu in game |
ErrorTrap is the one NRaas mod with a separate build per patch: the mod list offers one download for patch 1.69 and 1.70, and the ErrorTrap page has another for 1.67. Get the one that matches your game. The ErrorTrap page also says to check it against other core mods with Delphy's Dashboard tool before use.
What the other NRaas mods do
Descriptions are summarized from the NRaas mod list. Every mod has its own page at nraas.net with documentation and a FAQ.
| Purpose | Mod | What it does |
|---|---|---|
| The town | StoryProgression | Turns off EA's story progression and runs its own, aiming for a life-like balance among the households you do not play |
| The town | Register | Changes how role Sims are assigned, lets Sims keep a normal career alongside a role, and lets you pick who fills each role |
| The town | Traveler | Replaces the travel code, logs travel errors, and can load any world as a vacation destination |
| The town | Porter | Exports and imports whole groups of households with their relationships intact, for moving a town to a new save |
| Daily control | GoHere | A Go Here command you can stack in the queue, plus routing fixes |
| Daily control | Mover | Removes the eight-Sim limit and the adult requirement when moving households |
| Daily control | Saver | Reminds you to save, by default every 30 real minutes, cycling through four save names |
| Daily control | Relativity | Changes how fast a Sim day passes |
| Tuning and content | Careers | Loads custom careers, skills and book lists made by other modders |
| Tuning and content | Retuner | In-game switches for which interactions are autonomous or allowed |
| Tuning and content | Dresser | Automatically adjusts outfits across town and can block CAS parts you do not want townies to wear |
| Tuning and content | Tempest | Weather control per town, season and day |
| Interface | PortraitPanel | Shows up to 24 Sim portraits for oversized households |
| Interface | Tagger | Overhauls map tags: tag Sims and lots, color tags by criteria |
| Interface | DebugEnabler | Exposes EA's debug commands in game. NRaas notes some of them have side effects |
The list also carries smaller mods by Twallan and a set by anissims (Ani_), such as No Fridge Shopping and Shop For Clothes.
How to install NRaas mods
- Set up the Mods folder with
Packages,Overridesand Resource.cfg. NRaas offers its ownResource.zipon its How To Install page. - Download each mod from its page on nraas.net. The download buttons name the patches the file is for.
- Extract the zip and copy only the
.packagefile intoDocuments\Electronic Arts\The Sims 3\Mods\Packages. - Delete
CASPartCache.package,compositorCache.package,scriptCache.packageandsimCompositorCache.packageinDocuments\Electronic Arts\The Sims 3. - Start the game. A pop-up lists the script mods that loaded.
To update, copy the new file over the old one (the file name stays the same) and delete scriptCache.package. Never run two copies of one mod. To see what you have, use NRaas > Overwatch > Version, which lists the version of every NRaas mod installed.
Free · no download · LifeSim
A town that runs itself, with no mods.
In LifeSim every person is an AI character with a job, a home, a routine and a memory of you. Free in the browser and on iPhone. Import your Sims 3 household or type who you are.
Import my Sims 3 family →Use the official site only
NRaas mods are published at nraas.net, and the source code is public on GitHub, where the project is described as Twallan's mods, led by the NRaas community. The site states that earlier versions are no longer offered and that its old Mod Updater is no longer available. Copies on other sites can be outdated or altered, so skip them.
The site's own announcements report outages in May and June 2026. If nraas.net does not load, wait and try again instead of using a mirror.
NRaas mods are free. The best Sims 3 mods page pairs them with performance patches and gameplay mods.
FAQ
Which NRaas mods do I need?
ErrorTrap, Overwatch and MasterController cover stability and control. Everything else is optional. Add StoryProgression if you want the town to change on its own.
Does NRaas StoryProgression cause lag?
It is the NRaas mod players most often blame for a slow town, because it simulates every household you are not playing. If the game slows down, test without it first.
Do NRaas mods work with the EA app version?
The NRaas mod list labels its downloads for patches 1.67, 1.69 and 1.70. ErrorTrap has a separate file for 1.67, so match that one to your patch.
Is NRaas safe?
Download only from nraas.net. The project's source code is public on GitHub. Back up your Saves folder before adding any script mod.