Whisper API vs AssemblyAI vs Deepgram vs Speechmatics
A side-by-side look at scores, pricing and features — with RECATOOLS' ASEAN-aware verdict for each.
Whisper API
OpenAI's open-source speech-to-text
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AssemblyAI
Speech-to-text and audio intelligence API
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Deepgram
Real-time speech-to-text platform
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Speechmatics
Speech-to-text API tuned for heavy accents and dialects
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| RECATOOLS Score | 8.3 / 10 | 7.8 / 10 | 8 / 10 | 8 / 10 |
| Capability | ||||
| Value for money | ||||
| Ease of use | ||||
| ASEAN readiness | ||||
| API quality | ||||
| Pricing | Freemium | Paid | Freemium | Enterprise |
| Free tier | — | — | $200 free credit (one-time, no credit card required, no expiration) on the Pay As You Go plan | — |
| Paid from | — | — | Pay-as-you-go from $0.0048/min (Nova-3 Monolingual streaming) | — |
| Has API | ✓ | ✓ | ✓ | ✓ |
| Open source | ✓ | ✗ | ✗ | ✗ |
| Free to use | ✓ | ✗ | ✗ | ✗ |
| Users | — | — | 200,000+ developers | — |
| Founded | 2022 | 2017 | 2015 | 2006 |
| Maker | — | — | — | — |
| Verdict | Whisper is OpenAI's automatic speech-recognition model, available both as open-source weights and as a hosted API. It delivers excellent multilingual transcription and translation accuracy across noisy real-world audio,... |
AssemblyAI is a developer-focused speech AI platform delivering accurate transcription plus audio-intelligence features like speaker diarization, summarisation, sentiment, topic detection, and PII redaction through a cle... |
Deepgram is the specialist pick for latency-sensitive voice applications. Nova-3 streams transcription from $0.0048/min with sub-300ms latency, and the Flux model (multilingual since April 2026) builds end-of-turn detect... |
This is infrastructure, not an app, you're calling an API or SDK, not clicking through a dashboard for casual use. What it's genuinely good at is holding up on messy real-world audio: strong accents, overlapping speakers... |
| Full review → | Full review → | Full review → | Full review → |
Comparisons cover up to 4 tools. Scores are RECATOOLS editorial assessments; verify current pricing on each vendor's site.