Antonios

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Maker History

RubrkitGrade, rewrite, and test your AI instructions
Jul 2026
StampdA document blockchain stamping service
Jan 2019

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Joined Product HuntJanuary 2nd, 2019

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1mo ago

Rubrkit - Grade, rewrite, and test your AI instructions

Rubrkit reviews prompts, agent specs, commands, skills, workflows, and rubr_flow procedures against a clear 10-dimension rubric, then turns weak instructions into testable rewrites.

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7yr ago

STAMPD.IO - Use the Blockchain to timestamp files with indelible proof.

https://stampd.io has been one of the first public blockchain time stamping apps.

We are happy to announce our launching of a new app with fresh looks and many features.

We'd love to hear your impressions.