01 Cartesia
Low-latency voice AI platform behind the Sonic text-to-speech model, built for real-time agents
AI Audio & Music from $0 free tier: yes Verified JUL 5, 2026
Speechmatics alternatives
5 alternatives compared · prices last verified Jul 5, 2026 · how we verify
Cartesia is the top Speechmatics alternative in our directory: it covers the same category (AI Audio & Music), starts at $0, and has a free tier. All 5 alternatives below are compared on pricing verified against the official pricing pages, on the dates shown.
Ranked by category overlap with Speechmatics, free-tier availability, then lowest verified starting price — computed from our verified data, never sponsorships.
Speechmatics alternatives compared
| Alternative | Category | Starting price | Free tier | Price verified |
|---|---|---|---|---|
| Cartesia | AI Audio & Music | $0 | yes | Jul 5, 2026 |
| Deepgram | AI Audio & Music | $0 | yes | Jul 5, 2026 |
| AssemblyAI | AI Audio & Music | $0.15/hr | yes | Jun 23, 2026 |
| ElevenLabs | AI Audio & Music | $6/mo | yes | Jul 3, 2026 |
| Otter.ai | AI Productivity | $8.33/user/mo | yes | Jun 11, 2026 |
Each alternative, in brief
02 Deepgram
Developer-first voice AI API for speech-to-text, text-to-speech, and real-time voice agents
AI Audio & Music from $0 free tier: yes Verified JUL 5, 2026
03 AssemblyAI
Voice AI API for developers: speech-to-text, speaker diarization, audio intelligence, and LLM-over-audio with per-hour usage billing
AI Audio & Music from $0.15/hr free tier: yes Verified JUN 23, 2026
04 ElevenLabs
AI voice platform for text-to-speech, voice cloning, and conversational agents in 70+ languages
AI Audio & Music from $6/mo free tier: yes Verified JUL 3, 2026
05 Otter.ai
AI meeting assistant that transcribes, summarizes and extracts action items from conversations
AI Productivity from $8.33/user/mo free tier: yes Verified JUN 11, 2026
When to stay with Speechmatics
Documented strengths from our Speechmatics review — switching isn't always the right call:
- The free allowance renews monthly rather than being a one-off trial: 50 hours of speech-to-text plus 1 million TTS characters, no card required to begin
- Pro has no seat fee and no minimum commitment — usage is billed to the second at the per-hour rate
- Core accuracy features are not paywalled: diarization, custom dictionary, language identification, timestamps, and audio events are available on the Free plan