- Category
- Privacy & utilities
- Status
- In development
- Platforms
- iOS, Android
- Stack
- React Native, Expo, PDFKit
An offline PDF workspace: fill form fields, draw a signature once and reuse it from a local vault, and render the result into the document itself. Contracts never leave the device.
Signing a contract on a phone usually means uploading it. SignPure keeps the document local: fields are filled, a signature is drawn once and stored in an on-device vault, and the result is rendered into the PDF with PDFKit so the signature is part of the file rather than an annotation a viewer might not display.
How it will be proved
The verification is written and ready: a script renders the original and signed pages, diffs them, and fails unless a mark lands on the signature rule at the expected position. That check has not yet been run against the full in-app flow, so the app is listed as in development rather than shipping.
- Rendered signatures
- The signature is drawn into the page content with PDFKit, not attached as an annotation.
- Local signature vault
- Draw once, reuse. The vault never leaves the device.
- Form filling
- Fill text fields on the document before signing it.
- Pixel-level verification
- A diff of rendered pages proves the mark landed where it should before a release is accepted.
Captures of SignPure are pending. We would rather show you nothing than a drawing of a screen that was never photographed.