Compare / Hail vs Retell
Hail vs Retell
Retell packages voice agents, transfers, and analytics for phone operations. Hail gives your agent a call tool, an SMS tool, and an email tool.
Updated Aug 20265 min readBy the Hail team
Retell packages voice agents, transfers, and analytics for phone operations. Hail gives your agent a call tool, an SMS tool, and an email tool.
Choose Retell if you are setting up an AI phone operation and want packaged workflows, transfers, and analytics. Choose Hail if a larger agent controls the workflow and also sends SMS and email.
Retell provides managed voice agents, realtime orchestration, phone numbers, and call analytics. It is made for teams that replace or extend a call center.
You configure conversation design and workflows in Retell's platform. Retell charges per conversation minute in addition to the model and telephony costs. For a confirmation text or a follow-up email, you add other vendors, accounts, and bills. Retell is closed source and hosted only.
If a larger agent controls the workflow, Retell covers one channel of it. You also maintain the Retell platform configuration.
Retell bills each conversation minute, and you also pay the model and telephony costs.
Your agent passes a system prompt over MCP or REST. Hail's hosted voice pipeline runs the conversation, with turn detection and a transcript. Hail stores the transcript in the same event ledger as the agent's SMS and email. All three channels use the same API key and balance.
Hail publishes its pay-per-use rates. There are no seats and no platform subscription. Hail is open source (AGPL), and you can self-host it.
→ The Compare page has the full feature table.
This page reflects Retell's published capabilities and pricing as of August 2026. They change. Verify current details on Retell's site.
One key, one invoice, pay-as-you-go. See pricing.