Document signing app with a tamper-evident record

HashSign AI flags risky clauses, and a sealed PDF gets a tamper-evident SHA-384 record. The document stays on your device until you send or share it. Optional cloud review runs only when you tap it.

You can draft, inspect, and sign on your phone. HashSign is free to start. It is a document signing app, not a licensed notary, and it does not replace one.

When you seal a PDF, the app hashes that file on the device. Only the SHA-384 digest can be anchored. Hedera anchoring is a paid feature.

1:1 messages are encrypted messaging. Face Signature, when you use it, is US-only.

Get HashSign on the App Store and Google Play, or read how Hedera proof works.