How to add voice-note transcription to your app

AssemblyAI’s guide explains how applications can add voice-note transcription using its Sync API, which returns transcripts for short prerecorded clips in a single request without polling or job management. Developers should convert typical mobile audio formats to 16 kHz mono WAV or raw PCM, validate clips against the API’s 80-millisecond to two-minute and 40 MB limits, and render transcripts as expandable text beneath the original playable voice note rather than replacing it. It recommends transcribing on message open to reduce costs for often-unread notes, or on send when transcripts must support search and other text-based features. Multilingual conversations can be supported by supplying one or more likely language codes, ideally informed by existing conversation or user locale data. For existing archives, the guide advises concurrent but rate-limited backfills that respect retry headers, isolate bad files, and prioritize recent notes, while recordings exceeding two minutes should be routed to a separate asynchronous pre-recorded transcription service. Once converted to text, voice notes can become searchable, quotable, translatable, summarizable, and usable in downstream workflows such as task creation.

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