Stillcode › Two-factor authentication
Two-factor authentication, service by service
Fifty services: what each one actually supports, a link to its own setup instructions, and the question none of those instructions answer — what happens to your codes when the phone they live on stops existing.
Start here
Where the six digits come from, and why nobody can resend them When the phone holding your codes is gone
What still works, and the check to run before it happens
The short version, and it is the same on every page here. An authenticator code is computed on your device from a secret you were given once. Nothing transmits it, which is the security property — and which is also why nobody can send it back to you. If that secret exists on one device only, one accident ends it.
So the useful thing to do today is not to read fifty pages. It is to find your recovery codes for the two or three accounts you cannot afford to lose, and to count how many devices your codes exist on.
Developer and hosting
Social and messaging
Money, payments and crypto
Shops and storefronts
Gaming
Work and files
How this list was chosen
Every service here supports an authenticator app, and publishes its own instructions for switching one on. Services that offer only SMS, or only software of their own, are deliberately absent — a page recommending an authenticator app for an account that cannot use one would be a page written for a search engine rather than for a person.
Data sourced from 2FA Directory by 2factorauth. Snapshot 2026-09-24, filtered to the 50 services above.
Where Stillcode fits
Stillcode is an iPhone, iPad and Mac authenticator that makes no network calls at all. Unlimited accounts, bulk import, search, the Face ID lock and moving an account out by QR code are free; iCloud Keychain sync, the encrypted export file and restoring from one are Stillcode Pro.