Do all Authenticator Apps use the same algorithm?

these apps are use the same algorithm which is a generic algorithm not an application developer's algorithm. Am I right ?

Yes.

There are two commonly used protocol for authenticator apps:

  • HOTP (HMAC-based one time password), which is specified in RFC 4226
  • TOTP (Time-based one time password), which is specified in RFC 6238

The algorithms for the two protocols are specified in open standards, so yes, all implementations of it are inter compatible.

Tags:

Algorithm

Authentication

Passwords

Authenticator

One Time Password

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