Sista AI vs Retell AI
AI Voice and Phone
Sistava vs Retell AI
Retell AI is a developer-oriented platform for building voice agents with around 600ms turn-taking latency, which is genuinely best-in-class for the category. Honest concession: on raw voice quality and latency, a tuned Retell agent will beat a generalist platform. Sistava is built for a different shape of buyer: someone who wants voice as one of N channels a real worker uses, plus persistent memory, task boards, file drive, and thousands of app integrations the worker uses outside the call.
Profile
- Pricing
- Pay-as-you-go: $0.07+/min base + LLM + telephony (~$0.13-$0.31/min all-in). $10 free credits.
- Founded
- 2023, San Francisco (Y Combinator)
- Funding
- $5.1M Seed (Alt Capital). Reportedly profitable.
- Focus
- Developer-friendly voice agent builder with ~600ms latency
Why Sista AI
If voice latency and turn-taking are the deciding factor, Retell AI is the better pick. Sistava is the better pick when voice is one of several things a single employee does for you.,Retell AI is API-first; you write code to define the conversation and the integrations. Sistava is hire-first: brief the employee, they figure out the steps.,Sistava retains memory across calls and across channels (the same employee remembers what was emailed yesterday and said on the call today). Retell AI keeps per-call context.,Sistava offers predictable flat monthly pricing ($79-$799). Retell AI has per-minute billing with separate voice, LLM, and telephony components.,Sistava ships browser automation, task boards, and file Drive so the same worker can update your CRM, file the call notes, and post to Slack after hanging up. Retell AI ends at the call.
Feature Comparison
| Feature | Retell AI | Sista AI |
|---|---|---|
| Voice agent builder | Full AI workforce | |
| Core product (~600ms latency) | Deepgram STT/TTS | |
| Voice and telephony only | Voice, chat, browser, email, thousands of apps | |
| ✗ | ✓ | |
| ✗ | ✓ | |
| Per-call context | Persistent across calls and channels | |
| ✗ | ✓ | |
| ✗ | ✓ | |
| Telephony + custom APIs | Thousands of native + MCP | |
| 31+ languages | Multi-language | |
| HIPAA, SOC 2, GDPR | PII detection, approval gates | |
| ✗ | ✓ | |
| $0.13-$0.31/min all-in | Flat $79-$799/mo |