Alternative
Call0 as an alternative to HalloPetra
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.
On this page
Our recommendation
Our recommendation · as of 27 October 2026
For most small and medium-sized businesses we recommend Call0 over HalloPetra.
HalloPetra 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 | HalloPetra |
|---|---|---|
| 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 and office assistant (“Bürokraft”) for the skilled tradesSource: hallopetra.de |
| Entry price and what it includes | Launch: €110 per month or €1,188 per year; 700 minutes, 3 concurrent calls; netSource: call0.ai | Einzelkämpfer (solo operator): €99 per month for 1 employeeSource: hallopetra.de |
| Free trial | Yes, 15 test minutes without a credit card; no phone number in the Free planSource: call0.ai | Yes, free trial without a credit cardSource: hallopetra.de |
| German | Website and product in German; 13 agent languagesSource: call0.ai | Website in GermanSource: hallopetra.de |
| How to start | Sign up online; Enterprise on requestSource: call0.ai | Sign up onlineSource: hallopetra.de |
| 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 | Connected to the existing phone system by call forwardingSource: hallopetra.de |
| Integrations named | Over 500 in the directory, including calendars, CRM and ticketing systems; WhatsApp availableSource: call0.ai | Trade software (e.g. TAIFUN), Google Calendar, Outlook, HubSpot, ZapierSource: hallopetra.de |
| Provider’s registered seat | Call0 Inc., New York, USASource: call0.ai | HalloPetra GmbH, Berlin, GermanySource: hallopetra.de |
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 HalloPetra highlights itself
Fair is fair: this is what the provider writes about itself, each with a source.
- HalloPetra is explicitly aimed at trade businesses. Source: hallopetra.de
- The website names trade software such as TAIFUN as well as Google Calendar, Outlook, HubSpot and Zapier. Source: hallopetra.de
- According to the website, you can try it free of charge and without a credit card. Source: hallopetra.de
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 HalloPetra
According to each provider’s own focus, with sources in the provider comparison.
- Doctolib KI-Telefonassistent · Medical practices that want to use a phone assistant from Doctolib
- Ordicall · Medical practices, MVZ and clinics that want a guided setup
- 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
- voiceOne · Small businesses, practices and law firms that want to set up online themselves
- Audelia · Businesses that want to combine AI with a human phone team
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.
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.