Phonic vs Retell AI
A side-by-side comparison of Phonic and Retell AI, two Voice tools, drawn from Ignaite's continuously-verified listings.
Compared from listings verified as of
At a glance
| Attribute | Phonic | Retell AI |
|---|---|---|
| Category | Voice | Voice |
| Pricing (differs) | PAID | FREEMIUM |
| License | Proprietary | Proprietary |
| Deployment | Cloud | Cloud |
| Platforms (differs) | API, Web | Web, API |
| Model support (differs) | Self-contained (on-device) | Multi-model |
| Vendor (differs) | Phonic | Retell AI |
| Capabilities (differs) |
|
|
The honest brief
Phonic
Runs one proprietary speech-to-speech model at sub-300ms latency instead of an STT→LLM→TTS chain, with eval and observability built in for voice agents.
- Reliable tool calling for voice agents
- Natural turn-taking, low latency
- Built-in eval and observability
- Self-host / containerized option
- Enterprise-focused, no public free tier
- Pricing not published
- Younger than larger voice platforms
Retell AI
Bring your own LLM behind the voice agent, so it isn't locked to a single model like most all-in-one voice platforms.
- Inbound and outbound call handling
- SIP/Twilio telephony built in
- Low-latency turn-taking model
- No-code builder plus API
- Per-minute costs stack with LLM/TTS
- Voice quality depends on chosen vendors
- Cloud-only, no self-host
When to pick which
Both cover Voice agent and Tool / function calling.
Pick Phonic if you need LLM evaluation and LLM observability.
- LLM evaluation (secondary capability)
- LLM observability (secondary capability)
Pick Retell AI if you need AI app builder.
- AI app builder (primary capability)
They also differ on:
- Pricing
- PAID · FREEMIUM
- Model support
- Self-contained (on-device) · Multi-model