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 | Ultravox |
|---|---|---|
| Starting point | $0.03 per connected AI minute Platform fee, billed per second | $0.05 / min Pay-as-you-go; SIP extra |
| Payment model | Prepaid usage. $10 minimum top-up. No monthly subscription or free credits. | Usage-based pricing with additional plan options. |
| Cost scope | AI providers and carrier charges are additional. Customer-owned keys are paid directly to providers. | The published pay-as-you-go rate is $0.05 per minute. SIP is listed at an additional $0.005 per minute. |
| Working style | Configurable assistants, tools, knowledge, browser tests, simulations and call logs. | A speech-native agent approach. The site announces an acquisition by Inworld; confirm current onboarding and support terms. |
Evaluate the conversation architecture, then its operating terms.
A speech-native approach and a separately configured speech/model pipeline make different engineering choices. Test actual conversations instead of inferring quality from the architecture label. Also confirm which product and support terms apply when starting a new deployment.
When Ultravox may fit
Evaluate Ultravox when its speech-native behavior fits your use case and its current commercial and integration terms meet your requirements.
When APIFleet may fit
Evaluate APIFleet when you want a configurable provider stack and a workspace for testing, tools, knowledge and call inspection.
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 | Ultravox 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 Ultravox’s concurrency or seat limits from a minute rate; confirm them for your planned workload.
Run a one-assistant switching pilot
Before switching from Ultravox, 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
- Validate interruptions, names, tool calls and recovery with recorded scenarios.
- Include SIP and carrier charges in your telephone estimate.
- Confirm current onboarding, support and migration terms directly.
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 . Ultravox pricing and product notice.
This is APIFleet’s assessment, not an independent benchmark or an endorsement by Ultravox. Prices and packaging can change. Confirm the current terms and test your intended configuration before committing.