SignPure
Sign and fill PDFs without handing the contract to a cloud service.
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.
Capabilities
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.
Screens
What it looks like in use.
Select any screen to view it full size. Use the arrow keys to move between screens and Escape to close.
Open a PDF and fill its fields locally. Draw a signature once; it is stored in an on-device vault. The signature is rendered into the page content, not attached as an annotation.