Alternative
voiceOne and Call0 in a fact comparison
voiceOne is an AI phone assistant from Bamberg for small and medium-sized businesses in German-speaking countries. Call0 is aimed at the same audience and creates the assistant from your website.
As of 16 October 2026
What voiceOne publishes
- voiceOne names practices, trades, law firms and service providers as its audience. Source: voice-one.ai
- Getting started is a free start phase. Source: voice-one.ai
- The features page names calendars such as Google, Outlook and CalDAV as well as a DATEV export. Source: voice-one.ai
The facts side by side
| Feature | voiceOne | Call0 |
|---|---|---|
| Focus according to the provider | AI phone assistant for small and medium-sized businesses in German-speaking countries; practices, trades, law firms and service providers are namedSource: voice-one.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 | not stated publicly; the plans Basic, Premium and Professional are namedSource: voice-one.ai | Launch: €110 per month or €1,188 per year; 700 minutes, 3 concurrent calls; netSource: call0.ai |
| Free trial | Yes, “kostenfreie Startphase” (free start phase)Source: voice-one.ai | Yes, 15 test minutes without a credit card; no phone number in the Free planSource: call0.ai |
| German | Website in German; languages of the assistant not stated publiclySource: voice-one.ai | Website and product in German; 13 agent languagesSource: call0.ai |
| How to start | Sign up online and set it up yourselfSource: voice-one.ai | Sign up online; Enterprise on requestSource: call0.ai |
| Phone number | “Neue Rufnummer in voiceOne oder Ihre bestehende Nummer per Rufumleitung” (a new number in voiceOne or your existing number by call forwarding)Source: voice-one.ai | 1 number included in the Launch plan; each additional one €15 per month; forwarding your own number requires a paid planSource: call0.ai |
| Integrations named | Google, Outlook, CalDAV, eTermin, DATEV export, REST API and webhooksSource: voice-one.ai | Over 500 in the directory, including calendars, CRM and ticketing systems; WhatsApp is under maintenanceSource: call0.ai |
| Provider’s registered seat | voiceOne UG, Bamberg, GermanySource: voice-one.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 13 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 voiceOne if …
- you need a DATEV export from the phone assistant
- a provider based in Germany matters to you
- you are already set up with voiceOne and the start phase suits you
Choose Call0 if …
- you want to start online today without a sales call
- the assistant should be created from your website
- 3 concurrent calls should be included from the entry plan (Launch) onwards
- besides the phone, you also want to use a chatbot or an email assistant from the same provider
What matters when you switch
- Concurrent calls
- If several callers should get through at the same time, a plan with one line does not help, however low its price.
- Term and setup fee
- For a pilot, a plan that can be cancelled monthly is usually the simpler choice.
- Keeping your number
- Forwarding when the line is busy or outside opening hours is usually the easiest start; porting is rarely needed.
- Data
- Ask where the language model and transcripts are processed, how long they are stored and whether there is a data processing agreement.
More alternatives to voiceOne
According to each provider’s own focus, with sources in the provider comparison.
- fonio – Best for: Businesses in German-speaking countries looking for fixed minute packages and a provider in the EU
- Placetel AI – Best for: Businesses that already use a phone system and want to add the assistant
- Audelia – Best for: Businesses that want to combine AI with a human phone team
- elunos.ai – Best for: Companies with a steady need for minutes that want to start from industry templates
- Famulor – Best for: Companies and agencies that want to start usage-based without a base fee
- IONOS KI Telefonassistent – Best for: Businesses that want to pay per call instead of per minute and cancel monthly
Frequently asked questions
What does voiceOne cost?
voiceOne names the plans Basic, Premium and Professional, but the page that was checked states no prices. Call0’s prices are published on its pricing page.
Can I keep my existing number with both?
voiceOne names a new phone number or call forwarding from the existing number. With Call0, you forward your number to your Call0 number with a paid plan.
Read on: All providers compared · Costs at a glance · Facts about Call0
As of 16 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.