All you need is the TOTP secret, and it will generate OTPs. If you enter the secret in another TOTP app, you’ll also get OTPs. Here’s a Ruby lib that will render OTPs from a secret, for example: https://github.com/mdp/rotp
For an Android TOTP tool, I like FreeOTP+. You can even use it for Steam OTPs.
All you need is the TOTP secret, and it will generate OTPs. If you enter the secret in another TOTP app, you’ll also get OTPs. Here’s a Ruby lib that will render OTPs from a secret, for example: https://github.com/mdp/rotp
For an Android TOTP tool, I like FreeOTP+. You can even use it for Steam OTPs.