Welcome to the world of trusted digital signatures!

Crayonic is developing technology that enables trusted and compliant personal digital signatures.

We do this by making  digital signatures as usable as pen and paper in a traditional handwritten signature ceremony, while at the same time we protect their private key with all three authentication factors, in addition to the show-of-will required for signing.

We are convinced that our unique technology inspired by the familiar pen and paper will eventually bring digital signatures to the mainstream and will help secure valuable e-commerce transactions even in insecure mobile environments.

At the very core of our solution is a secure touch screen stylus allowing citizens to assert their trusted electronic identity (eID)  in mobile environments. Thanks to our patent pending technology, the stylus allows conversion of the hand written signature into the cryptographic digital signature.


Signing of electronic documents

Signing of electronic documents with 100% eIDAS compliant qualified electronic signature

Trusted identity

Asserting persons trusted identity via digital signatures for e-Government services

Strong authentication

Strong authentication to remote services, especially those requiring mutual SSL. We are also working on UAF/U2F support for secure passwordless “sign-in" (pun intended)

Secure connectivity

Securing mobile browser connectivity to enterprise or government networks via VPN or similar technology

Proving identity

Proving ones identity during valuable e-commerce transactions e.g. online loan application

Other uses

Any other use cases where digital signatures are used and require maximum security available today with certified HW key store protected with behavioural biometric authentication e.g. cryptocurrency transactions, smart contracts etc.



Stylus for all

Usable as a standard touch screen stylus for all mobile devices. Tips are replaceable and available for both resistive and capacitive touch screens.

No charging

Includes single high quality long-life AAA replaceable battery that should last years worth of signatures. We’ll send you a new one before the old one runs out.


Ideal for tablets. Works with most modern Android mobile devices with iOS support coming soon. Requires Bluetooth 4 (low energy) wireless communication protocol.


Asserts the owners trusted digital identity only after successfully recognising owners handwriting. Identity is secured by EAL 4+ certified smart card chip.

All Signatures

Supports digitised handwritten signature capture for e-signing of documents by untrusted third parties in addition to the owner’s trusted digital signature.

For Developers

Available SDK for developers to enable integration to 3rd party apps for e-signing,  bitcoin wallets, internet banking, web authentication, etc. – coming soon.

Future proof

Replaceable secure element in micro SIM format and ready to support Universal Authentication Factor (UAF) and Universal Second Factor (U2F) standards.


team photo

Peter Kolarov - CEO/founder - experienced entrepreneur, spend past 5 years architecting, developing and selling award winning electronic signature solutions to global customers in finance. Peter has been an enterprise solution architect with focus on security, identity and access management in finance and public sectors. He has sold his first US based venture in 2001, and is still developing SW and hacking for over  20 years and counting. He is a true full stack product developer and architect with valuable business and domain experience.

Peter Kolarov

team photo

Michal Varchola, PhD - CTO/co-founder - is highly experienced embedded HW engineer and cryptography expert. Besides developing commercial embedded HW solutions, he has presented and published his research worldwide on FPGA secure random number generators, cryptographic HW,  side-channel attacks, and many other cryptography/security topics.

Michal Varchola



Pre production prototype

Pre production prototype

Currently we are testing our new version of HW with the stylus PCB enclosed in 3D stereolithography printed casing - we have already identified few new issues, however overall we are very pleased with the results on how the stylus handles, the weight

Crayonic Intro

Crayonic Intro

After a few man-years of research and development and some compulsory IP protection we have decided that its a good time to make our efforts a bit more public than our in-person updates.  I know a few people were wondering what is taking us so long,



Crayonic s.r.o.

Námestie SNP 30, Bratislava, Slovakia

+421 908 925 135