Alternative
fonio and Call0 in a fact comparison
fonio and Call0 are both ready-made AI phone assistants for businesses. The table shows what both providers publish themselves.
As of 6 October 2026
What fonio publishes
- fonio publishes fixed packages with minutes, concurrent calls and numbers. Source: fonio.ai
- Website and product are in German; the pricing page states over 60 languages. Source: fonio.ai
- The provider is fonio GmbH, based in Vienna, i.e. in the EU. Source: fonio.ai
The facts side by side
| Feature | fonio | Call0 |
|---|---|---|
| Focus according to the provider | AI phone assistant in German; the homepage names medical practices, lawyers, car repair shops, hotels and tradespeople, among othersSource: fonio.ai | 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 | Solo: €119 per month with monthly billing, €99 per month with annual billing; 1,000 minutes, 1 concurrent call; netSource: fonio.ai | Launch: €110 per month or €1,188 per year; 700 minutes, 3 concurrent calls; netSource: call0.ai |
| Free trial | Homepage: “Kostenlose personalisierte KI” (free personalised AI), can be created in 30 seconds; the pricing page does not mention a free trial period for the plansSource: fonio.ai | Yes, 15 test minutes without a credit card; no phone number in the Free planSource: call0.ai |
| German | Website and product in German; over 60 languages according to the pricing pageSource: fonio.ai | Website and product in German; 12 agent languagesSource: call0.ai |
| How to start | Start online (Solo and Team plans)Source: fonio.ai | Sign up online; Enterprise on requestSource: call0.ai |
| Phone number | 1 number included in the Solo plan; each additional one €9 per monthSource: fonio.ai | 1 number included in the Launch plan; each additional one €15 per monthSource: call0.ai |
| Integrations named | Slack, Salesforce, HubSpot, Calendly, Trello, NotionSource: fonio.ai | Over 500 in the directory, including calendars, CRM and ticketing systems; WhatsApp is under maintenanceSource: call0.ai |
| Provider’s registered seat | fonio GmbH, Vienna, AustriaSource: fonio.ai | 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 fonio if …
- a provider based in the EU matters to you
- one of the published plans fits your call volume
- you are already set up with fonio and your integrations run there
Frequently asked questions
What does fonio cost compared with Call0?
Both entry plans are in the table above, with source and date. Calculate with your own minutes: included minutes, concurrent calls and additional minutes differ.
Can I keep my number if I switch?
Yes. With Call0 you forward your existing number or use a Call0 number. Porting is not required for this.
In detail in the blog: Call0 vs. Fonio (in German) · Fonio-Alternativen 2026 (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.