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23rd July 2025 - Link Blog

1KB JS Numbers Station. Terence Eden built a neat and weird 1023 byte JavaScript demo that simulates a numbers station using the browser SpeechSynthesisUtterance, which I hadn't realized is supported by every modern browser now.

This inspired me to vibe code up this playground interface for that API using Claude:

Screenshot of a speech synthesis tester web interface showing: Speech synthesis tester, Text to speak:, Hello, this is a test of the speech synthesis API!, Voice:, Default voice, Rate: 1, Pitch: 1, Volume: 1, Speak, Stop, Ready to speak

Posted 23rd July 2025 at 4 pm

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This is a link post by Simon Willison, posted on 23rd July 2025.

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