Alternative

HalloPetra and Call0 in a fact comparison

HalloPetra is an AI phone assistant and office assistant for the skilled trades. Call0 is an AI phone assistant for small and medium-sized businesses in all industries that you create from your website.

As of 16 October 2026

What HalloPetra publishes

The facts side by side

Information from the providers on the linked pages. As of 16 October 2026
FeatureHalloPetraCall0
Focus according to the provider
AI phone assistant and office assistant (“Bürokraft”) for the skilled tradesSource: hallopetra.de
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
Einzelkämpfer (solo operator): €99 per month for 1 employeeSource: hallopetra.de
Launch: €110 per month or €1,188 per year; 700 minutes, 3 concurrent calls; netSource: call0.ai
Free trial
Yes, free trial without a credit cardSource: hallopetra.de
Yes, 15 test minutes without a credit card; no phone number in the Free planSource: call0.ai
German
Website in GermanSource: hallopetra.de
Website and product in German; 13 agent languagesSource: call0.ai
How to start
Sign up onlineSource: hallopetra.de
Sign up online; Enterprise on requestSource: call0.ai
Phone number
Connected to the existing phone system by call forwardingSource: hallopetra.de
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
Trade software (e.g. TAIFUN), Google Calendar, Outlook, HubSpot, ZapierSource: hallopetra.de
Over 500 in the directory, including calendars, CRM and ticketing systems; WhatsApp is under maintenanceSource: call0.ai
Provider’s registered seat
HalloPetra GmbH, Berlin, GermanySource: hallopetra.de
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 HalloPetra if …

  • your business works with one of the trade software products named
  • you are looking for an assistant aimed only at the skilled trades
  • a provider based in Germany matters to 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 HalloPetra

According to each provider’s own focus, with sources in the provider comparison.

  • Doctolib KI-Telefonassistent – Best for: Medical practices that want to use a phone assistant from Doctolib
  • Ordicall – Best for: Medical practices, MVZ and clinics that want a guided setup
  • 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
  • voiceOne – Best for: Small businesses, practices and law firms that want to set up online themselves
  • Audelia – Best for: Businesses that want to combine AI with a human phone team

All providers compared

Frequently asked questions

What does HalloPetra cost compared with Call0?

HalloPetra states its entry plan for one employee, Call0 states monthly plans with included minutes. Both entry prices are in the table with their source.

Does Call0 work with call forwarding like HalloPetra?

Yes. You forward your existing number to your Call0 number; this requires a paid plan. Porting is not required for this.

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.

    HalloPetra alternative: Call0 in a fact comparison