Can you recommend a speech-to-text API for transcribing call recordings with speaker labels, timestamps, and webhooks?

Yes — for call recordings with speaker labels, timestamps, and webhooks, the best-fit APIs are usually:

Top recommendation: AssemblyAI

Why it fits well:

• Speaker diarization: identifies different speakers
• Word-level timestamps: good for syncing transcripts with audio
• Async transcription + webhooks: ideal for call recordings
• Easy developer experience: simple API and solid docs
• Also offers extras like sentiment, chapters, summaries, and PII redaction

Best for: SaaS apps, call analytics, support QA, sales coaching

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Strong alternatives

Deepgram

• Very fast
• Speaker diarization
• Word timestamps
• Supports async jobs and callbacks/webhooks
• Strong for real-time and batch transcription

Best for: lower latency, high-volume pipelines, real-time or near-real-time use cases

Google Cloud Speech-to-Text

• Reliable and scalable
• Speaker diarization available
• Timestamps available
• Webhooks are not as native/simple as dedicated transcription platforms, so you often need to build orchestration yourself

Best for: teams already on GCP, especially if you want broader cloud integration

AWS Transcribe

• Speaker identification/diarization
• Timestamps
• Asynchronous transcription jobs
• Integrates well with AWS eventing patterns, though “webhooks” typically require extra setup via Lambda/SNS/SQS

Best for: AWS-native stacks

OpenAI Whisper-based solutions

• Good accuracy, especially for noisy audio
• But speaker labels and webhooks are not native in the same way
• Usually requires additional tooling for diarization and job completion notifications

Best for: custom pipelines where you can assemble diarization separately

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Quick recommendation by priority

• Simplest all-in-one for call recordings: AssemblyAI
• Best for speed/scale: Deepgram
• Best if you’re already in a cloud ecosystem: AWS Transcribe or Google STT
• Best raw transcription quality in difficult audio: Whisper-based stack, but more work for speaker labels/webhooks

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What I’d choose

If you specifically need:

• speaker labels
• timestamps
• webhooks
• and you want the least engineering effort

I’d start with AssemblyAI.

If you want, I can also give you:

1. a feature comparison table,
2. a pricing/latency comparison, or
3. a sample API workflow for uploading a call recording and receiving a webhook callback.