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Zadarma is listed as a free starter PBX, and some Reddit users say it works well for their calls. Others report missed incoming calls, one-way audio, or unhelpful support. Those reports point to risks worth checking, not proof that every account will fail. The alternatives below are mostly communications APIs or developer tools, not confirmed one-for-one PBX replacements. If you need a conventional business phone system, verify number support, routing, rates, and limits before switching.
01Why people leave Zadarma
Incoming calls may not reach devices
A Reddit user reported that calls to a UK number did not ring in the Android app or forward to a US phone.
Audio or messaging can fail
One Reddit post described calls with no two-way audio and SMS that could be sent but not received.
Support reports are mixed
Some commenters praised live support; others said support was unhelpful, making reliability harder to judge from user reports alone.
02The alternatives, ranked by fit
- Telecom and AI infrastructure
TelnyxTelnyxConsider Telnyx if you are replacing Zadarma as part of a larger telecom build, rather than looking for a simple app swap. It is aimed at teams combining telecom and AI services, builders needing carrier network access, and high-volume users comparing usage rates. The listing shows a free plan but also a starting price of $5,000, so confirm what that figure covers.
Trade-off: The $5,000 listed starting price is a poor fit for casual use; confirm billing and limits.
7.8/10from
$5,000/mofree plan - Multi-channel communications
Vonage Communications APIsVonage Communications APIsVonage suits teams building customer interactions across voice, video, and messaging, including organizations serving customers across countries. That gives developers a broader communications API to evaluate than a starter PBX. The listing starts at $13.99, but does not specify the billing basis or included limits here; check those details before comparing it with Zadarma.
Trade-off: API pricing and user sentiment are unverified; included limits are not specified here.
5.5/10from
$13.99/mo - Custom communications workflows
TwilioTwilioTwilio is a fit if you want to build calling and other communications into your own workflows or app. It is aimed at teams using several messaging channels and developers who need usage-based APIs. The listing starts at $0.0001 and includes a free plan, but it flags usage costs and messaging registration friction as budget considerations.
Trade-off: Usage costs and messaging registration add planning work; it is not presented as a ready-made PBX.
7.6/10from
$0.00/mofree plan - Enterprise voice and messaging
Bandwidth Communications APIsBandwidth Communications APIsBandwidth is worth evaluating if your team is building voice or messaging products, needs U.S. SMS and RCS APIs, or is assessing SIP trunking. Those are closer to telecom infrastructure needs than a general starter PBX. Its pricing is described as usage-based, but a starting price is not published, and there are few public signals on service quality.
Trade-off: Starting price is not published, and public signals on service quality are limited.
6.0/10from
Custom - Realtime voice AI
DailyDailyDaily is aimed at teams building realtime voice AI agents or adding audio and video calls to an app. Developers also get an open-source agent framework, according to the listing. It has a free plan starting at $0 and free minutes, but the number of included minutes is not specified here, so forecast usage before committing.
Trade-off: Minute caps are not specified here; it is a developer toolkit, not a listed PBX.
7.0/10from
Freefree plan - Multichannel customer conversations
GupshupGupshupGupshup may suit businesses moving beyond basic calling to multichannel customer conversations, WhatsApp campaigns, or AI in voice support. The listing describes pay-as-you-go entry pricing, which can be a useful alternative to committing to a fixed plan. Its starting price and limits are not published here, and layered fees make total cost less clear.
Trade-off: Starting price and limits are unclear; layered fees can complicate cost estimates.
6.8/10from
Custom - Messaging and payments
CM.com Communications PlatformCM.com Communications PlatformCM.com is a candidate if your switch involves more than phone service: it targets teams combining messaging and payments, coordinating customer conversations, or exploring AI agents across channels. The listed starting price is $58. That gives you a concrete entry figure to compare, but the plan limits and what the price includes are not specified here.
Trade-off: The $58 entry price comes with unspecified plan limits.
6.0/10from
$58/mo
03Side by side
| Tool | Score | From | Free plan | Best for |
|---|---|---|---|---|
 Zadarma Zadarma (current) | 5.9 | Free | Yes | Teams wanting a free starter PBX |
| Telnyx Telnyx | 7.8 | $5,000/mo | Yes | Teams combining telecom and AI services |
| Vonage Communications APIs Vonage Communications APIs | 5.5 | $13.99/mo | No | Teams building multi-channel customer interactions |
| Twilio Twilio | 7.6 | $0.00/mo | Yes | Teams building custom communications workflows |
| Bandwidth Communications APIs Bandwidth Communications APIs | 6.0 | Custom | No | Enterprises building voice and messaging products |
| Daily Daily | 7.0 | Free | Yes | Teams building realtime voice AI agents |
| Gupshup Gupshup | 6.8 | Custom | No | Teams building multichannel customer conversations |
| CM.com Communications Platform CM.com Communications Platform | 6.0 | $58/mo | No | Teams wanting messaging and payments together |
Questions people ask
Is Zadarma a good fit for a free starter PBX?
The listing identifies Zadarma as best for teams wanting a free starter PBX, so it may suit a basic setup. But Reddit reports include both successful use and problems with incoming calls, audio, and support. Treat those as individual reports, and confirm that your call routing and devices work before relying on the service.
Which Zadarma alternative is a direct PBX replacement?
The alternatives listed here are largely communications APIs or developer tools, and none is identified in the published material as a one-for-one PBX replacement. Telnyx includes carrier network access and Bandwidth lists SIP trunking, but check whether either supports your required numbers, routing, and day-to-day phone setup before switching.
How much do Zadarma alternatives cost?
The listed starting prices range from $0 for Daily to $58 for CM.com, while Twilio is listed from $0.0001 and Vonage from $13.99. Gupshup and Bandwidth have no starting price published here. Telnyx is listed from $5,000 alongside a free-plan label; verify billing units, plan limits, and usage charges directly.