At a glance
Compare the scope of each rate before comparing the number. All amounts below are USD.
Scroll across the table to see both platforms.
| What matters | APIFleet | Twilio ConversationRelay |
|---|---|---|
| Starting point | $0.03 per connected AI minute Platform fee, billed per second | $0.07 / min ConversationRelay; Voice costs separate |
| Payment model | Prepaid usage. $10 minimum top-up. No monthly subscription or free credits. | Per-minute ConversationRelay usage, with telephone usage billed separately. |
| Cost scope | AI providers and carrier charges are additional. Customer-owned keys are paid directly to providers. | ConversationRelay handles the speech connection. Your application supplies the conversation logic and LLM integration. |
| Working style | Configurable assistants, tools, knowledge, browser tests, simulations and call logs. | A WebSocket integration connects a developer-controlled application to speech and calls. |
Choose between an application building block and an agent workspace.
ConversationRelay is useful to evaluate when you already own the conversational backend. APIFleet instead supplies a configurable assistant runtime and management interface. Using Twilio as a carrier with APIFleet is a separate architecture from running ConversationRelay.
When Twilio ConversationRelay may fit
Evaluate ConversationRelay when your application should own the conversational logic and you want to connect it to Twilio’s speech and telephone services.
When APIFleet may fit
Evaluate APIFleet when you want to configure prompts, providers and HTTP tools, then test and inspect calls in an existing workspace.
APIFleet currently limits new workspace access. Existing users can sign in; contact us about a new project. Carrier accounts, standalone previews, file transcription and simulation caller/judge models require customer-owned credentials.
Two workloads to price explicitly
These hypothetical examples assume exactly 1,000 or 10,000 connected AI minutes. They calculate APIFleet’s platform portion only; model, speech, carrier, numbers and any other service charges must be added.
| Workload | APIFleet platform arithmetic | Twilio ConversationRelay estimate |
|---|---|---|
| Pilot: 1,000 minutes | 1,000 × $0.03 = $30.00 | Apply the vendor’s published or quoted terms to the same provider stack and duration. |
| Operation: 10,000 minutes | 10,000 × $0.03 = $300.00 | Include subscriptions, allowances, overages, rounding and implementation work when applicable. |
A bundled vendor rate cannot be compared directly to the APIFleet platform portion. We do not infer Twilio ConversationRelay’s concurrency or seat limits from a minute rate; confirm them for your planned workload.
Run a one-assistant switching pilot
Before switching from Twilio ConversationRelay, recreate one assistant, replay its tool requests, test interruptions and transfers, then move one controlled route with a written rollback. Use the voice-agent migration checklist and conversation test plan with the vendor-specific checks below.
What to test before switching
- Include your model, application hosting and Twilio Voice charges.
- Test streaming, interruption and reconnect behavior in your application.
- Map existing telephone routing before changing the speech runtime.
There is no universal one-click import. Map prompts, tools, credentials and routing explicitly, then run controlled calls. Our gradual migration guide gives you a sequence with a rollback boundary.
Sources & review
Official vendor pages checked on . Twilio conversational AI pricing · ConversationRelay documentation.
This is APIFleet’s assessment, not an independent benchmark or an endorsement by Twilio ConversationRelay. Prices and packaging can change. Confirm the current terms and test your intended configuration before committing.