Nextiva vs Twilio Flex
Side-by-side from the Top 11 rankings of The 11 Best VoIP Business Phone Systems and The 11 Best Call Center Software Platforms. Last verified June 16, 2026.
The short answer
Nextiva ranks higher on Top 11 (#1 vs #11) for Small businesses replacing landlines with cloud phone systems / Support and sales teams running inbound or outbound call centers. Top choice for its exceptional 99.999% uptime, comprehensive features, and highly-rated US-based customer support.
At a glance
| Nextiva | Twilio Flex | |
|---|---|---|
| Top 11 rank | #1 / The 11 Best VoIP Business Phone Systems | #11 / The 11 Best Call Center Software Platforms |
| Score (out of 9.4) | 9.3 | 7.2 |
| Best for | Best overall for reliability and support | Building a custom solution |
| Pricing | $$ ($24 to $40/user/mo) | $$$ (Usage-based) |
| HQ | Scottsdale, USA | San Francisco, USA |
| Founded | 2006 | 2008 |
Nextiva
Top choice for its exceptional 99.999% uptime, comprehensive features, and highly-rated US-based customer support.
www.nextiva.comTwilio Flex
A developer platform for building a fully customized contact center.
www.twilio.com/flexSee full entry in The 11 Best Call Center Software Platforms
Methodology and scoring weights live at /methodology. No vendor pays for placement — see about.