Tremi vs. Vapi.
Vapi builds AI assistants for voice and chat, including SMS. Tremi coordinates your Retell agents with later outreach and connected-app actions.
Checked against official product documentation on .Choose Tremi when
You already use Retell and need the workflow around the conversation: timing, additional channels, stop rules, and the CRM handoff.
Choose Vapi when
You want to build the assistants themselves on Vapi and use its calling campaigns, chat, and SMS capabilities.
| Product area | Tremi | Vapi |
|---|---|---|
| Build | Configure outbound around connected voice and chat agents. | Build and configure Vapi assistants for voice and chat. |
| Coordinate | AI conversations, standard SMS, automated email, and app actions in a recipient workflow. | Outbound calling campaigns and SMS conversations through Vapi. |
| Inspect | Conversation evidence, a workflow goal, and separate downstream-action results. | Campaign and call results, plus chat session history. |
The run record includes its version and provider receipts.
Provider events remain attached to the recipient. Tremi records why the sequence continued or stopped, and can deliver the result through a signed webhook or configured app actions.
See run evidence in contextRead the Vapi documentation.
See your first result.
Preview a reactivation, then set up your voice and AI SMS channels with Tremi. No provider accounts needed.
250 trial credits · 14 days · Unlimited simulationsNo credit card required.