BotAI agents / Voice agents
Vapi
by Vapi
Developer platform for building and running voice AI phone agents.
Closed sourcePaidVoice agents
Strengths
- Mix and match STT, LLM and TTS providers
- Per-second billing
- Developer-friendly APIs
Weaknesses
- Total cost per minute depends on stack
- Needs technical setup
- Not open source
| Best for | Developers building custom phone agents |
|---|---|
| Not for | Non-technical teams wanting a turnkey bot |
| Pricing | $0.05/min platform fee + STT, LLM, TTS and telephony at cost |
| Open source | No (Proprietary) |
| Category | Voice agents |
| Verified | 2026-10-14 |
Alternatives
ElevenLabs' platform for conversational voice agents.
+ Top-tier voice quality
− LLM and telephony billed separately
Closed sourceFree optionVoice agents
Voice agent platform for automating phone calls.
+ No contract or base fee
− Per-minute cost depends on configuration
Closed sourcePaidVoice agents
Related task guides
Sources
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