Fuseji
Mask confidential documents before they reach AI.
Fuseji is a macOS app that finds names, companies, addresses and account numbers in confidential documents such as contracts, and replaces them with placeholders. Everything happens inside your Mac. No document is ever sent anywhere.
Public beta. Free while in beta.
Why Fuseji
Documents stay on your Mac
A local AI on your Mac performs the anonymisation. Nothing goes to an external AI service, cloud or analytics provider. No usage data, no crash reports. The only time Fuseji reaches the network is when it downloads the AI model, during first-run setup or when the model is fetched again.
Built for legal documents
Party names in contracts, names in signature blocks, defined short forms such as "hereinafter X", account and case numbers — Fuseji is built around the patterns that appear in contracts and legal records. The same person or company becomes the same placeholder throughout the document, so the relationships in the text remain readable after masking.
It tells you what it might have missed
Machine detection has limits. Fuseji runs a two-stage check and flags the places where something may still be exposed. A person makes the final call — the screen is built on that assumption.
How it works
- Paste text, or drag in a file (txt / md / docx / PDF with selectable text)
- The local AI finds proper nouns, contact details and account numbers, and replaces them with placeholders such as ［人名1］ or ［法人名2］
- Review the masked text and the replacement table. Additions, merges and "do not mask" instructions are collected and applied together with Update
- Check the result, then copy it or save it as a text file. Output is blocked while unapplied changes or unreviewed warnings remain
Before handing anything to an external AI service, check for yourself that no real names or confidential details remain. Keep the original document in your own hands.
Who it is for
- Lawyers and law firms who want to use AI for contract review or translation but cannot let client information leave the office
- Legal and IP departments whose internal rules restrict putting confidential documents into cloud AI
- Professionals and consultants who handle documents containing customer information
System requirements
| Item | Requirement |
|---|---|
| Mac | Apple Silicon Mac (M1 or later) |
| Memory | 16GB or more |
| OS | macOS 13 or later |
| Disk | About 6GB free, including the 5.2 GB AI model |
| Network | Needed for first-run setup and when the AI model is fetched again |
On first launch, Fuseji downloads the AI model used for masking (Google Gemma, 5.2 GB). After that it works offline.
Pricing
Fuseji is free to use during the public beta.
- Free allowance: 10,000 runs per month, 100,000 characters per run (provisional figures for the beta period)
- Paid plans may be introduced, and the free allowance may change. Any change will be announced on this page beforehand
Frequently asked questions
Download
Download Fuseji 0.1.0 (macOS / Apple Silicon)| Item | Value |
|---|---|
| Version | 0.1.0 (public beta) |
| File | Fuseji_0.1.0_aarch64.dmg |
| Size | 32.5 MB |
| SHA-256 | c7bd1e493966152dab26795dfe41f0a0befdb810556eae3b13e6f85dfc779158 |
Signed with a Developer ID and notarised by Apple. You can confirm the file arrived intact using the SHA-256 above.
shasum -a 256 ~/Downloads/Fuseji_0.1.0_aarch64.dmg