Web App
EFA is available as an online web app — the same fitting tool, running entirely in your browser. Nothing to install: open the site, complete the first-run setup, and start fitting.
- Stable — https://app.efa-tech.dev: tracks released versions. Use this one for everyday fitting.
- Nightly preview — https://app-preview.efa-tech.dev: tracks the development branch. You get new features earlier, but things may break without warning.
Browser Requirements
Section titled “Browser Requirements”The web app relies on two modern browser capabilities:
- SharedArrayBuffer (cross-origin isolation) — required for the fitting engine to run in background workers. See browser compatibility.
- OPFS (Origin Private File System) — required for local data and storage. See browser compatibility.
The site is tested on Chromium-based browsers (Chrome, Edge, and similar) and Firefox. Safari may not be fully supported.
Storage Notes
Section titled “Storage Notes”All data lives in your browser’s local storage for the site you are using — downloaded game data (repository blobs and the localization database) in OPFS, and fits, characters, and settings in IndexedDB:
- Clearing the site’s data in your browser deletes everything stored by the app.
- The stable site and the nightly preview keep separate storage; fits created on one are not visible on the other.
- Data is not shared with native installs of EFA. To move fits between the web app and a native app, export them and import them on the other side. See Exporting Fits and Importing Fits.
Next: First-Run Setup.