Developer builds PromptVault, a Git-style local version control tool for AI prompts

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A developer frustrated by losing track of iterative AI prompt edits built PromptVault, a lightweight version control tool designed specifically for prompt engineering. The tool, written in Rust and distributed as a single ~2MB binary, works similarly to Git but targets prompt files such as .txt, .md, and .yaml formats. PromptVault stores history in a local .pv folder, keeping it separate from existing code repositories, and requires no account, cloud sync, or telemetry. Users can commit prompt versions, view diffs, revert to earlier iterations, and run local A/B comparisons across branches without making any model API calls. The project aims to solve the common problem of engineers losing effective prompt versions amid cluttered folders of renamed duplicates.

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