NTT Communications COTOHA Voice
NTT Com's Japanese-first STT under the COTOHA AI platform.
NTT Com's Japanese-first STT under the COTOHA AI platform.
Best for japanese enterprise customers needing domestic vendor + data-residency. Pricing: tiered JPY-denominated.
What it is
COTOHA is NTT Communications' Japanese-language AI platform. The voice family includes speech-to-text and text-to-speech APIs tuned for Japanese, with broadcast-quality models and call-center variants. NTT Com pitches it for domestic data-residency-sensitive workloads (finance, government, healthcare). International availability and English support are limited; the product is primarily B2B inside Japan. Best fit: japanese enterprise customers needing domestic vendor + data-residency. Caveats: japanese-first; documentation primarily in japanese. Pricing as listed: tiered JPY-denominated. Feature flags from vendor docs: streaming. Directory tags: commercial-api, regional-asia. Last vendor-page check: 2026-05-12.
Watch out for: Japanese-first; documentation primarily in Japanese.
Install / use
COTOHA API: POST /v1/voiceFeatures
| Speaker diarization | No |
| Word-level timestamps | No |
| Streaming / real-time | Yes |
| Languages supported | 1 |
| HIPAA eligible | No |
NTT Communications COTOHA Voice vs Whipscribe
| Feature | NTT Communications COTOHA Voice | Whipscribe |
|---|---|---|
| Category | Transcription APIs | Transcription APIs |
| Pricing | tiered JPY-denominated | free beta |
| Speaker diarization | — | Yes |
| Word timestamps | — | Yes |
| Streaming | Yes | No |
| Languages | 1 | 99 |
| Platforms | API | Web, API, MCP |
Alternatives to NTT Communications COTOHA Voice
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