MySaveFile

The Sims 4 Save Planner

Plan your dream save

A planning companion for The Sims 4. Map out worlds, households, sims, clubs, holidays, and businesses — before you build them in-game, after you import a save, or somewhere in between.

Drop in a .save and the planner pulls everything: lot types, family names, sim lifestages, club rosters, even your custom venues. Or start from a blank canvas and dream up a save piece by piece.

Track build progress. Collect inspo. Annotate your worlds. Share a public showcase. Whatever the story, this is the notebook for it.

About the creator

A short bio is coming soon — hi 👋, made by someone who loves The Sims and wanted a real planning tool for it. More to come.

How it works

Your .save file is read locally in your browser. The raw file is never uploaded — only the extracted records (names, types, assignments) live in the planner's database. Your photos are stored privately to your account unless you flip the public-sharing switch.

Built with

React 18, TypeScript, Vite, Zustand, React Router
Node.js + Express + PostgreSQL
Cloudflare R2 for photo storage
Railway for hosting
Claude Code (Anthropic) — AI pair-programming

A note on AI

I'd rather be upfront than coy: this app was coded with the help of Claude Code, Anthropic's AI coding assistant, used as a pair-programmer.

The vision, the design, the Sims know-how, and every decision about how it works are mine — the AI helped me write and refactor the code faster than I could alone. There's no AI-generated art or content anywhere: the visuals are EA's official world maps and in-game icons (credited below) plus the design system I built by hand.

Credits

This project is an independent re-implementation of community-documented file formats. No copyrighted EA / Maxis code or assets are redistributed.

Format knowledge comes from:

s4pi — DBPF v2.1 container format and ALFA-embedded thumbnail layout
Phase-3-Sims-4-Game-Mod by jolieschae — decompiled .proto definitions
Sims 4 Studio — ResourceKey instance hexes for the in-game icon pickers

See THIRD_PARTY.md for the full acknowledgements.

License

MIT — see LICENSE.

The Sims™ is a trademark of Electronic Arts Inc. This is an unofficial, non-commercial fan project, not affiliated with or endorsed by EA.