Retell vs Vapi vs Bland vs Custom LiveKit: Honest Comparison From Someone Who Shipped All Paths
TL;DR
- Retell: fastest to production. Vapi: most developer control among platforms. Bland: outbound-focused. LiveKit custom: cheapest and most controllable at scale.
- Choose by monthly minutes: <20K use a platform, >20K build on LiveKit.
- Lock-in is the hidden cost, model and provider swaps are where custom stacks win long-term.
How do Retell, Vapi, Bland and custom LiveKit compare?
Compared on what actually matters in production:
| Criterion | Retell | Vapi | Bland | Custom LiveKit |
|---|---|---|---|---|
| All-in cost/min | ~8–12¢ | ~10–15¢ | ~9–13¢ | ~2.5–4¢ |
| Time to production | Days | Days–weeks | Days | 3–4 weeks |
| Latency control | Good | Good | Fair | Full |
| Provider swaps (STT/TTS/LLM) | Limited | Good | Limited | Total |
| Lock-in | High | Medium | High | None, you own it |
| Best for | Fast launch | Dev teams | Outbound | Scale + margins |
My actual experience
I shipped Retell to production in 48 hours, the integration produced a 70% false-positive reduction in our AI interviews, which Retell published as a case study. Later, at scale, I built our own LiveKit stack with SmallestAI and Cartesia and took per-minute cost from ~10¢ to 2.5¢ with quality unchanged.
Both decisions were right at the time. That's the honest answer most comparison posts won't give you: the platform got us to market, the custom stack got us margins. Sequence them. If you're past the ~20K minutes/month crossover, my AI voice agent development service is exactly this migration.