Building CaptionSpark: live captions for audio inside Chrome

Building CaptionSpark: live captions for audio inside Chrome



Tópico: Building CaptionSpark: live captions for audio inside Chrome
Categoria: Tutoriais | Programação & Tecnologia
Idioma Principal: Português (Conteúdo de Tecnologia)

Descrição do Conteúdo / Informações:
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I recently shipped CaptionSpark, a Chrome extension that turns browser audio into live captions.

The narrow use case is this: you are already on a page, audio is playing, and you want readable text without opening another app. That can be a video, a webinar, an X Space, a call, or a stream.

The extension starts from the active tab and puts captions over the current page. It also supports Spanish translation and keeps a transcript while the session is running.

What I learned while building it:

• Caption UX is mostly about trust. People need to know when capture is active.

• Latency matters more than perfect layout. If text arrives late, the overlay feels broken.

• The overlay has to be visible but not loud.

• Pricing by minutes is clearer than pretending transcription has no cost.

It is early, but working. I would appreciate feedback on the onboarding and the overlay.

Chrome Web Store:

https://chromewebstore.google.com/detail/captionspark-browser-audi/phmkpkbjecdlklhmemgncabkddbpapnn