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The daily AI-engineering brief. Built in public. EN · UA.

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AI Toolbox

Free, local-first utilities for people who build with AI. Each tool is bilingual, citation-backed, and designed to avoid sending private inputs to us.

  • Free Prompt Optimizer for Claude (Fable 5)

    Live

    A local, citation-backed prompt linter for Claude Fable 5, Sonnet 4.6, Haiku 4.5, and Opus 4.8.

    Last verified: June 11, 2026Open tool