whisper.cpp vs Whisper API vs Deepgram vs AssemblyAI
A side-by-side look at scores, pricing and features — with RECATOOLS' ASEAN-aware verdict for each.
| WHI whisper.cpp C/C++ port of OpenAI's Whisper: offline speech-to-text on almost any d... Visit |
Whisper API
OpenAI's open-source speech-to-text
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Deepgram
Real-time speech-to-text platform
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AssemblyAI
Speech-to-text and audio intelligence API
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| RECATOOLS Score | 8.3 / 10 | 8.3 / 10 | 8 / 10 | 7.8 / 10 |
| Capability | — | |||
| Value for money | — | |||
| Ease of use | — | |||
| ASEAN readiness | — | |||
| API quality | — | |||
| Pricing | Free | Freemium | Paid | Usage_based |
| Free tier | Everything — MIT-licensed code, freely downloadable ggml model files and official Docker images; no hosted or paid product exists | The open-source Whisper model is free to run yourself; the hosted API is paid | $200 free credit (one-time, no credit card required, no expiration) on the Pay As You Go plan | Not offered as a plan — free usage covers up to 185 hours of pre-recorded or 333 hours of streaming transcription, no card |
| Paid from | — | API: gpt-realtime-whisper $0.017 a minute — whisper-1 is no longer on the price list | Pay-as-you-go from $0.0048/min (Nova-3 Monolingual streaming) | Pay as you go — Universal-2 $0.15/hour, Universal-3.5 Pro $0.21/hour |
| Has API | ✓ | ✓ | ✓ | ✓ |
| Open source | ✓ | ✓ | ✗ | ✗ |
| Free to use | ✓ | ✓ | ✗ | ✗ |
| Users | — | — | 200,000+ developers | — |
| Founded | — | 2022 | 2015 | 2017 |
| Maker | — | — | — | — |
| Verdict | whisper.cpp is for turning speech into text on hardware you control. It compiles to a lightweight dependency-free binary, loads a single ggml model file — tiny (75 MiB) through large-v3, plus q5_0 quantizations — and tra... |
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,... |
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... |
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... |
| 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.