Cap
vs
OTP Auth

Cap vs OTP Auth

How do Cap and OTP Auth compare? Here are the facts side by side: pricing, platforms, open-source status and what each one is for.

Directory details: Cap and OTP Auth
Directory detailCapOTP Auth
What it is
Cap provides a self-hosted, open source alternative to CAPTCHA challenges for websites.
Manage two-factor authentication codes with OTP Auth, an iOS app listed on the App Store.
Website
Type
Website
Website
Topic
Pricing
Not confirmed
Freemium
Platforms
Web
iOS, Web
Open source
Not stated
Not stated
Language
English
English
Alternatives

Other options to consider

Sites similar to both Cap and OTP Auth.

Lucia

lucia-auth.com

Lucia was deprecated in March 2025. The website was updated in July 2026 and points to code/auth_session.ts as a single-file replacement for the NPM package and to the Auth Book for auth information.