Side by side

Duo Auth API vs Twilio Verify

Both stand on multi-factor authentication apis. Which one you can start free with, which one lets you read the code, and what each costs once you pay.

Twilio Verify provides a broad set of verification channels and controls through an API. Its pay-as-you-go model and integration resources fit application teams, while channel fees should be included in cost planning.

Visit Twilio Verify

The facts

	Duo Auth API	Twilio Verify
Free plan	Not published	A free trial
Open source	Not published	Not published
Runs on	Not published	API, Web
Lowest paid plan	Not published	See the plans
Plans published	None	2
Maker	Not published	Not published
Website	duo.com	twilio.com
On multi-factor authentication apis	#21 of 25	#17 of 25

Duo Auth API: what it does well

Twilio Verify: what it does well

Supports SMS, WhatsApp, voice, email, push, and TOTP
Fraud Guard includes rate limiting and SMS-pumping protection
Handles regional rules across more than 200 regions
Base fee applies to successful verifications
Quickstarts, webhooks, and client libraries are listed

What to know first

There is no free plan
Channel delivery charges may still apply
Base pricing is per successful verification
Volume pricing requires contacting sales

Alternatives to Duo Auth API Alternatives to Twilio Verify The whole list