Top pick · highest health
Routr
Lightweight SIP proxy, location server, and registrar for a reliable and scalable SIP infrastructure.
DockerK8S
Communication - SIP
Open source alternatives to Twilio
We track 6 open-source Twilio alternatives, of which 4 currently score 70 or above on Repoly's GitHub health scale and 1 ship a Docker image. Routr leads on health at 93/100 with 375 commits in the last 90 days; across all 6 projects you are choosing between GPL-2.0, MIT, MPL-2.0.
updated Oct 2026 6 alternatives best health 93 ★ 15k combined 1,582 commits / 90d 1 with Docker
Top picks to replace Twilio
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Healthiest
Health 93/100: 375 commits in 90 days, latest release v2.31.6, Docker image available.
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Most starred
5,267 stars, the biggest community among Twilio alternatives.
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Most active
642 commits in the last 90 days, more than any other option here.
Showing 6 of 6 tools
All 6 Twilio alternatives, ranked by health
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FreeSWITCH
Scalable open source cross-platform telephony platform.
C -
Asterisk
Easy to use but advanced IP PBX system, VoIP gateway and conference server.
Cdeb -
Kamailio
Modular SIP server (registrar/proxy/router/etc).
Cdeb -
openSIPS
SIP proxy/server for voice, video, IM, presence and any other SIP extensions.
C -
Freepbx
Web-based open source GUI that controls and manages Asterisk.
PHP
Twilio alternatives compared
Routr edges FreeSWITCH 93 to 85, and most of the difference is Docker support: a Docker image against no Docker image. FreeSWITCH has the largest following at 5.3k stars, yet ranks #2 of 6, held back mostly by Docker support (no Docker image).
The most recent release is Routr v2.31.6, published today. openSIPS publishes no tagged releases, which costs up to 25 of the 100 points. None of the measured options scores under 40. By stack, C (4) and PHP (1) are the most common. Routr and FreeSWITCH are permissively licensed; Asterisk, Kamailio, openSIPS and 1 more are copyleft. Freepbx is not hosted on a forge Repoly can read, so it has no measured score yet.
| Tool | Health | Stars | Licence | Last commit | Docker |
|---|---|---|---|---|---|
| Routr Up 14 points since 11 Sep | 93 | 1.7k | MIT | today | Yes |
| FreeSWITCH Steady at 85 since 11 Sep | 85 | 5.3k | MPL-2.0 | 2 days ago | No |
| Asterisk Steady at 84 since 11 Sep | 84 | 3.7k | GPL-2.0 | yesterday | No |
| Kamailio Steady at 84 since 11 Sep | 84 | 3k | GPL-2.0 | yesterday | No |
| openSIPS Steady at 58 since 11 Sep, no tagged release | 58 | 1.5k | GPL-2.0 | yesterday | No |
| Freepbx | 10 | 0 | GPL-2.0 | unknown | No |
Twilio alternatives: common questions
What is the most maintained open source alternative to Twilio?
Routr scores highest at 93/100, with 375 commits in the last 90 days, 1.7k stars on GitHub and its latest release (v2.31.6) published today. Kamailio has the most raw commit activity at 642 commits in 90 days.
Which Twilio alternatives use a permissive licence?
2 of 6 are permissively licensed (MIT, Apache, BSD or similar): Routr (MIT), FreeSWITCH (MPL-2.0). 4 use copyleft licences such as GPL or AGPL, which require you to publish changes if you distribute a modified version.
Which Twilio alternatives run in Docker?
1 of 6 publish a Docker image or Compose file: Routr. Docker support contributes 10 of the 100 available health points, because it is the clearest signal that self-hosting is a supported path rather than an afterthought.
Is Routr or FreeSWITCH the better Twilio alternative?
On measured health Routr leads, 93 to 85. Routr has 375 commits in 90 days, 1.7k stars and v2.31.6 from today; FreeSWITCH has 78 commits in 90 days, 5.3k stars and v1.11.3 from 2 months ago. FreeSWITCH is ahead on stars, so it is the stronger pick if that is what you weigh most.
Are the Twilio alternatives still maintained?
4 of the 5 measured options score 70 or above. Every measured option had commits in the last 90 days. None scores under 40.
What languages are the Twilio alternatives written in?
C: FreeSWITCH, Asterisk, Kamailio and openSIPS. PHP: Freepbx. The stack matters if you plan to extend or patch the tool yourself.
