Alternative
Call0 as an alternative to voiceOne
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.
On this page
Our recommendation
Our recommendation · as of 27 October 2026
For most small and medium-sized businesses we recommend Call0 over voiceOne.
voiceOne has its strengths, which we list further down with sources. For most small and medium-sized businesses we recommend Call0, for these reasons:
- Live the same day
- Enter your website, and Call0 builds the assistant from it. 15 test minutes in the browser, without a credit card or sales call.
- Several lines from the first plan
- Launch includes 3 concurrent calls, 700 minutes and 1 phone number. Nobody hears a busy tone when two customers call at once.
- A person takes over when it matters
- Handover to your team with a queue, hold music, opening hours and a callback list. The caller is never left hanging.
- Phone, WhatsApp, email and chat in one account
- One knowledge base for every channel. You maintain it once, and every assistant answers the same way.
- Over 500 integrations
- Appointments land in your calendar, requests in your CRM or ticketing system, without manual copying.
- Set up in conversation
- Agent0 sets up the assistant with you and changes it when you ask. No prompt writing, no flow builder.
The facts side by side
What both providers publish themselves, with source and date of the check.
| Feature | Call0 | voiceOne |
|---|---|---|
| Focus according to the provider | AI assistant for phone, WhatsApp, email and website chat for small and medium-sized businesses; handover to staff with a queue; the agent is created from the company’s own websiteSource: call0.ai | 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 |
| Entry price and what it includes | Launch: €110 per month or €1,188 per year; 700 minutes, 3 concurrent calls; netSource: call0.ai | not stated publicly; the plans Basic, Premium and Professional are namedSource: voice-one.ai |
| Free trial | Yes, 15 test minutes without a credit card; no phone number in the Free planSource: call0.ai | Yes, “kostenfreie Startphase” (free start phase)Source: voice-one.ai |
| German | Website and product in German; 13 agent languagesSource: call0.ai | Website in German; languages of the assistant not stated publiclySource: voice-one.ai |
| How to start | Sign up online; Enterprise on requestSource: call0.ai | Sign up online and set it up yourselfSource: voice-one.ai |
| Phone number | 1 number included in the Launch plan; each additional one €15 per month; forwarding your own number requires a paid planSource: call0.ai | “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 |
| Integrations named | Over 500 in the directory, including calendars, CRM and ticketing systems; WhatsApp availableSource: call0.ai | Google, Outlook, CalDAV, eTermin, DATEV export, REST API and webhooksSource: voice-one.ai |
| Provider’s registered seat | Call0 Inc., New York, USASource: call0.ai | voiceOne UG, Bamberg, GermanySource: voice-one.ai |
Switching to Call0 pays off 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
- calls should be handed over to your team when a person is needed, with a queue, hold music and opening hours
- besides the phone, you also want to answer WhatsApp, email and the website chat with the same knowledge
- you would rather tell Agent0 what to change than build flows yourself
What Call0 does besides the phone
One account, one knowledge base, every channel.
- Phone assistant
Answers calls around the clock, books appointments, records requests and makes outbound calls. Speaks 13 languages.
Phone assistant → - Handover to your team
When a person is needed, the phones of your team ring: queue with hold music, ringing in turn, hold and transfer, opening hours and fallback rules.
- WhatsApp assistant
Replies to customer messages on WhatsApp with the same knowledge as on the phone. You choose between assist, approval and autopilot.
WhatsApp assistant → - Email assistant
Reads your inbox and prepares replies. Sensitive topics always go to a person; nothing is deleted or archived.
Email assistant → - Website chatbotComing soon
Answers visitors on your website from the same knowledge and hands over requests to your team.
Website chatbot → - Agent0 and integrations
Agent0 sets up and adjusts the assistant with you in plain language. Over 500 integrations connect calendars, CRM and ticketing systems.
Integrations →
What voiceOne highlights itself
Fair is fair: this is what the provider writes about itself, each with a source.
- 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
How to switch smoothly
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 · Businesses in German-speaking countries looking for fixed minute packages and a provider in the EU
- Placetel AI · Businesses that already use a phone system and want to add the assistant
- Audelia · Businesses that want to combine AI with a human phone team
- elunos.ai · Companies with a steady need for minutes that want to start from industry templates
- Famulor · Companies and agencies that want to start usage-based without a base fee
- IONOS KI Telefonassistent · 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.
As of 27 October 2026. The ranking follows the criteria named on the page. Information about other providers comes from their linked pages and was checked on the date stated; the provider’s own page is authoritative. Brand names belong to their owners; no partnership is claimed. If an item is no longer correct, write to support@call0.ai.