Best CMU Sphinx Alternatives in 2026
Updated
20 apps from speech recognition software ranked against CMU Sphinx on the same published basis.
- 1CMU Sphinx vs Notta
- 2CMU Sphinx vs Speechmatics
- 3CMU Sphinx vs Superwhisper
- 4CMU Sphinx vs MacWhisper
- 5CMU Sphinx vs Amazon Transcribe
- 6CMU Sphinx vs AssemblyAI
- 7CMU Sphinx vs Google Cloud Speech-to-Text
- 8CMU Sphinx vs Voice In
- 9CMU Sphinx vs Rev AI
- 10CMU Sphinx vs Soniox
- 11CMU Sphinx vs Otter.ai
- 12CMU Sphinx vs Kaldi
- 13CMU Sphinx vs sherpa
- 14CMU Sphinx vs Dragon Professional
- 15CMU Sphinx vs ESPnet
- 16CMU Sphinx vs Talon Voice
- 17CMU Sphinx vs Yandex SpeechKit
- 19CMU Sphinx vs SpeechRecognition
- 20CMU Sphinx vs Whisper
- 21CMU Sphinx vs NVIDIA Riva
CMU Sphinx alternatives compared
| # | App | Score | Free plan | From | Runs on |
|---|---|---|---|---|---|
| 1 | Notta | 6.7 | Free plan | $8.17/mo | Android, Browser, iOS, Mac, Web, Windows |
| 2 | Speechmatics | 6.6 | Free plan | Free | API, Linux, Mac, self-hosted, Web, Windows |
| 3 | Superwhisper | 6.6 | Free plan | $7.08/mo | Android, iOS, Mac, Windows |
| 4 | MacWhisper | 6.5 | Free plan | €64/mo | iOS, Mac |
| 5 | Amazon Transcribe | 6.4 | Free plan | $0.01/mo | API, Web |
| 6 | AssemblyAI | 6.4 | Free plan | $0.15/mo | API, self-hosted, Web |
| 7 | Google Cloud Speech-to-Text | 6.4 | Free plan | $0.02/mo | API, self-hosted, Web |
| 8 | Voice In | 6.4 | Free plan | — | Linux, Mac, Windows |
| 9 | Rev AI | 6.3 | Free plan | $0.01/mo | API |
| 10 | Soniox | 6.2 | Free plan | $19.99/mo | API |
| 11 | Otter.ai | 5.7 | No | — | Android, Browser, iOS, Mac, Windows |
| 12 | Kaldi | 5.5 | No | — | Web, Windows, Mac, Linux, Android |
| 13 | sherpa | 5.5 | No | — | Android, iOS, Linux, Mac, Web, Windows |
| 14 | Dragon Professional | 5.4 | No | — | Windows |
| 15 | ESPnet | 5.4 | No | — | API, Linux, Mac, Windows |
| 16 | Talon Voice | 5.4 | No | — | Linux, Mac, Windows |
| 17 | Yandex SpeechKit | 5.4 | No | — | API, Web |
| 19 | SpeechRecognition | 5.3 | No | — | Windows, Mac, Linux |
| 20 | Whisper | 5.2 | No | — | Windows, Mac, Linux |
| 21 | NVIDIA Riva | 5.1 | No | — | — |
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Questions about CMU Sphinx alternatives
What is the best alternative to CMU Sphinx?
Notta, number 1 in speech recognition software with a score of 6.7 out of 10. The others here: Speechmatics, Superwhisper, MacWhisper and 16 more.
What is the best free alternative to CMU Sphinx?
Notta is the best-ranked alternative with a free plan. 10 of the 20 alternatives here publish a free plan on their own pricing pages.
How are these alternatives ranked?
Ranked free-and-open first: a usable free tier and open-source code, then the platforms it runs on and its documentation.