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Retell AI and Call0 in a fact comparison
Retell AI is a platform for teams that build voice agents themselves and pay by usage. Call0 is a ready-made phone assistant with a monthly plan.
As of 6 October 2026
What Retell AI publishes
- Retell AI bills by usage, with no base fee. Source: retellai.com
- There is $10 in credit to start. Source: retellai.com
- The website names connections to Twilio, Vonage, Make, n8n and HubSpot. Source: retellai.com
The facts side by side
| Feature | Retell AI | Call0 |
|---|---|---|
| Focus according to the provider | Platform for building, deploying and managing AI voice agents for phone callsSource: retellai.com | AI phone assistant for small and medium-sized businesses; the agent is created from the company’s own websiteSource: call0.ai |
| Entry price and what it includes | Usage-based with no base fee: $0.07 to $0.31 per minute, depending on model and voiceSource: retellai.com | Launch: €110 per month or €1,188 per year; 700 minutes, 3 concurrent calls; netSource: call0.ai |
| Free trial | Yes, $10 in starting creditSource: retellai.com | Yes, 15 test minutes without a credit card; no phone number in the Free planSource: call0.ai |
| German | Website in English; multilingual agents according to the provider, the number of languages is not stated thereSource: retellai.com | Website and product in German; 12 agent languagesSource: call0.ai |
| How to start | Sign up online; Enterprise with custom pricingSource: retellai.com | Sign up online; Enterprise on requestSource: call0.ai |
| Phone number | $2 per month per number; your own numbers can be connected at no extra chargeSource: retellai.com | 1 number included in the Launch plan; each additional one €15 per monthSource: call0.ai |
| Integrations named | Twilio, Vonage, Make, n8n, HubSpot, GoHighLevelSource: retellai.com | Over 500 in the directory, including calendars, CRM and ticketing systems; WhatsApp is under maintenanceSource: call0.ai |
| Provider’s registered seat | Retell AI Inc., Redwood City, California, USASource: retellai.com | Call0 Inc., New York, USASource: call0.ai |
Call0 at a glance
- Setup
- You enter your website address. Call0 prepares the assistant from it and calls you for a test.
- Plan
- Launch costs €110 per month or €1,188 per year and includes 700 minutes, 3 concurrent calls and 1 phone number. Each additional minute costs €0.16.
- Trial
- 15 test minutes in the browser, without a credit card.
- Languages
- The agent speaks 12 languages.
- Integrations
- Over 500 integrations in the directory, including calendars, CRM and ticketing systems.
What you should know about Call0
- The provider is a US company: Call0 Inc., New York.
- Data is not processed exclusively in the EU. The privacy policy names Ireland, the USA and worldwide processing, among others.
- WhatsApp is under maintenance and cannot currently be activated.
- Contracts are available to business customers only.
- The Free plan does not include a phone number.
Stay with Retell AI if …
- your team wants to choose and pay for model and voice per agent itself
- you make calls irregularly and do not want a monthly plan
- an English-language website and prices in US dollars suit you
Frequently asked questions
Is Retell AI cheaper than Call0?
That depends on model, voice and minutes. Retell AI states a range per minute; Call0 states monthly plans with included minutes. Both figures are in the table.
How do I set up Call0?
You enter your website address, Call0 prepares the assistant from it and calls you for a test.
In detail in the blog: Call0 vs. Retell AI (in German)
Read on: All providers compared · Costs at a glance · Facts about Call0
As of 6 October 2026. Call0 is itself one of the providers named. All information comes from the linked pages of the providers and was checked on the date stated; the page of the respective provider is authoritative. No products were tested and no ratings were given. Brand names belong to their owners; no partnership is claimed. If an item is no longer correct, write to support@call0.ai.