blue·auth
Create, sign and preserve.
Only for iPhone
Free · Designed for iPhone. Not verified for macOS.
iPhone
Sign contracts and documents from your phone, with legal standing recognised across the European Union.
When somebody sends you a document to sign, it turns up here. You get a notification, open it, read the whole thing and sign in the right place. No more printing, signing by hand, scanning and sending it back.
QUALIFIED SIGNATURES
Sign with the Portuguese Chave Móvel Digital and you get a qualified electronic signature, the highest level European law recognises. It carries the same weight as a signature witnessed in person, and is accepted by courts, banks, notaries and public services. If you would rather not, you can always sign the ordinary way, by drawing your signature on the screen.
IDENTITY CHECKS
When the sender asks for stronger proof, the app captures a photo of your identity document and runs a short video check that tells a real person from a photograph. All of it is stored alongside the document, as evidence.
ALWAYS KNOW WHERE THINGS STAND
See what is waiting for you, what you have signed and what is finished. On a document with several people, you can see who has signed and who is still holding it up.
THE ORIGINAL IS ALWAYS ONE STEP AWAY
Every signed document carries a code that takes anyone back to the original online, with the full record of who signed, when and from where. Print it or share it freely: the paper never loses its link to the original.
PRIVATE BY DEFAULT
The app opens with Face ID or Touch ID. Your documents are yours, and blue·auth was built from the ground up to prove a document is genuine without having to expose it.
PART OF blueauth.co
The app is one piece of a larger platform, with timestamping, document anonymisation, certificates, forensic evidence custody and tools for teams. What you sign here shows up there, and the other way round.
A blue·auth account is required. You can create one at blueauth.co.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Security
Face ID is now asked for when the app is closed and opened again. Closing it used to be the easiest way to open it without one.
The lock screen no longer shows what is behind it — and your documents no longer appear in the app switcher.
Screenshots and screen recordings no longer capture the content.
More languages
German, Italian and Dutch. That makes eight, and the choice lives in your account: switching here switches the website too.
Faster
Profile pictures and company logos are no longer downloaded again every time you change tab.
The developer, The Danyalgil Company, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Linked to You
The following data may be collected and linked to your identity:
- Contact Info
- User Content
- Identifiers
- Sensitive Info
- Other Data
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Danyalgil & Danyalgil, Lda.
- Size
- 42.2 MB
- Category
- Business
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Age Rating
4+
- 4+
- Copyright
- © 2026 Danyalgil & Danyalgil, Lda.