FREEDOM251

Freedom251 › Communication

Free and open first

Best Voice APIs in 2026

Voice APIs let software place or receive phone calls through an API. This list is for people comparing hosted services, mobile or web platforms, and self-hosted options such as Asterisk.

  1. 1

    Aculab Cloud

    Free plan AndroidAPIiPhone+2

    Aculab Cloud offers a broad set of communications APIs and a free Trial for development. Check the outbound rate limit and unsupported premium-rate calls against the intended use.

    7.7 Visit site
  2. 2

    Asterisk

    Free plan APILinuxSelf-hosted

    Asterisk provides a broad framework for building communications systems, with multiple interfaces and VoIP protocols.

    7.4 Free plan Visit site
  3. 3

    FreeSWITCH

    Free plan APILinuxMac+2

    FreeSWITCH provides a no-cost, self-hostable framework with call-control and integration options.

    7.3 Free plan Visit site
  4. 4

    Kamailio

    Free plan APILinuxSelf-hosted
    7.1 Free plan Visit site
  5. 5

    Wazo Platform

    by Wazo Platform
    Free plan AndroidAPIiPhone+3

    Choose Wazo Platform if you need a free, self-hosted and programmable foundation for telecom services.

    6.9 Open source Visit site
  6. 6

    SIP.IO

    Free plan APIWeb

    SIP.IO combines programmable voice and contact center features, with options for messaging, recording, and AI-assisted calls.

    6.8 Free plan Visit site
  7. 7

    YateClient

    Free plan AndroidiPhoneLinux+2

    Choose YateClient if you want a free desktop messenger and softphone with chat features and multiple telephony protocols. For SIP calling, you need an account with a SIP provider.

    6.6 Free plan Visit site
  8. 8

    Callr

    Free trial AndroidAPIiPhone+1

    Callr combines programmable communications, tracking, conversation intelligence, and AI agents for business workflows.

    6.4 From €599/mo Visit site
  9. 9

    Infobip Voice API

    Free trial AndroidAPIiPhone+1

    Infobip provides a broad set of programmable voice functions and connectivity options, with tools for both developers and business users.

    6.2 60-day trial Visit site
  10. 10

    Plivo Voice API

    Free trial AndroidAPIiPhone+1

    Plivo Voice API combines call handling, recording, and streaming audio with developer SDKs and integrations.

    6.1 Visit site
  11. 11

    Amazon Chime SDK PSTN Audio

    Paid AndroidAPIiPhone+2
    6.0 Visit site
  12. 12

    D7 Networks

    Free trial APIWeb

    D7 Networks combines messaging APIs with WhatsApp chatbot and number lookup tools. Buyers should account for usage-based messaging and the listed per-message fees when considering its paid service.

    6.0 Visit site
  13. 13

    Amazon Chime SDK Voice Connector

    Paid APISelf-hostedWeb
    5.9 From $0.00 Visit site
  14. 14

    drachtio

    Free plan Linux
    5.9 Free plan Visit site
  15. 15

    Telnyx SIP Trunking

    Free trial AndroidAPIiPhone+1

    Telnyx combines SIP connectivity with calling safeguards, a range of integrations, and usage-based calling rates.

    5.9 Visit site
  16. 16

    46elks

    Paid APIWeb

    46elks brings SMS, MMS, and voice features under one API, with SDKs and integrations for application workflows.

    5.8 Visit site
  17. 17

    Fonoster

    Free plan Web
    5.8 Free plan Visit site
  18. 18

    jambonz

    Free plan Web
    5.8 Free plan Visit site
  19. 19

    sipgate.io

    Free plan Web
    5.7 Free plan Visit site
  20. 20

    CallFire API

    Paid API

    CallFire API combines messaging, calling and event notifications with multiple SDK options and documented authentication requirements.

    5.5 From $1/mo Visit site
  21. 21

    Commio Voice API

    Paid API
    5.4 Pricing on request Visit site
  22. 22

    Kaleyra Voice API

    Paid API

    Choose Kaleyra Voice API if your business needs programmable inbound and outbound calling, broad country coverage, and integrations with business platforms.

    5.2 Pricing on request Visit site
  23. 23

    Orange Voice API

    Paid API
    5.2 Pricing on request Visit site
  24. 24

    Apifonica Voice API

    Paid Web
    4.7 Pricing on request · 30-day trial Visit site
  25. 25

    EnableX Voice API

    Paid AndroidiPhoneWeb
    4.7 30-day trial Visit site

#1Places #1, #2, #3, #4, #5 on this list can be bought by the makers of the software on it. See the price

Compare free plans, trials, paid starting prices, and pricing on request. Review call direction, number availability, SIP, recording, concurrent-call limits, SDK languages, supported platforms, and licensing when code access matters.

Questions

Are free Voice APIs available?

Yes. Asterisk is listed as free, and Aculab Cloud offers a free plan. Other entries may be paid or require pricing on request.

Which Voice APIs include a free trial?

Aculab Cloud offers a free trial. Apifonica Voice API lists a 30-day trial. Trial terms vary by provider.

What platforms do these Voice APIs support?

The list includes services for web, API, iOS, Android, self-hosted, and Linux environments. Amazon Chime SDK PSTN Audio also lists Windows.

Can I use a Voice API for inbound calls?

Inbound calling is a comparison field for this list. Alianza Crux API is listed with inbound calling support.

How is Voice API pricing shown?

Pricing may be a free plan, a paid starting price, or pricing on request. Examples include Amazon Chime SDK Voice Connector from $0.00 and Azure Communication Services from $1 per month.

More in Communication