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Guess how old this code is
Paste a snippet. The AI reads the style, the patterns, the naming — and guesses which era it's from. Try your oldest file and see if it gets close.
Fastest way to try it — no setup
Try it instantly with your Claude.ai login →
No API key, no signup on this site — it uses your normal Claude.ai usage. Opens on claude.ai.
No key stored yet. Get one at platform.claude.com — the check calls the API directly from your browser with your key, so you pay for your own usage (typically a fraction of a cent per check). The key is saved only in this browser's local storage; this site has no server and never sees it.
Example result for the code above — click “Guess its age” for your own.