KeyNesta vs Proton Authenticator
Current as of 2 October 2026. Proton rows checked against Proton's own product and download pages.
Proton Authenticator arrived more complete than most apps manage in years: free, fully open source, end-to-end encrypted sync, import from a long list of other authenticators, direct export, and native builds on effectively every platform including a watch. It is a strong product, and we would rather describe it accurately than pretend otherwise.
Where it runs
| Where it runs | KeyNesta | Proton Authenticator |
|---|---|---|
| Codes in a web browser | Yes, the full app | No, native apps only |
| iPhone and iPad | No, built and in store review | Yes, plus Apple Watch |
| Android | No, built and in store review | Yes |
| Desktop app | No | Yes, on macOS, Windows and Linux |
Your data
| Your data | KeyNesta | Proton Authenticator |
|---|---|---|
| Sync | Optional, zero-knowledge; the server holds ciphertext only | Optional, end-to-end encrypted with a Proton account |
| Works offline | Yes, codes are generated on the device | Yes, and usable with no account at all |
| Export | Plain standard file, any time | Yes, direct export |
| Account needed | No account to start, no phone number ever | None to generate codes, a Proton account to sync |
| Open source | No | Yes, all Proton apps |
| Ads or tracking | None | None |
Organization
| Organization | KeyNesta | Proton Authenticator |
|---|---|---|
| Structure | Vaults, spaces, nested groups, tags | One list |
| Folders that nest | Yes | No |
| Separate encrypted vaults | Yes | No |
Where Proton Authenticator is the better choice
Open source code anyone can audit, a large company behind it, and apps on every platform you own. If those are your criteria there is no argument to make — take Proton. KeyNesta is a small product from a small business, it is not open source, and it has had no independent security audit. Both are free, and neither carries ads.
Where KeyNesta is the better choice
Filing at scale, and we are not going to claim more than that. Proton Authenticator gives you a list. KeyNesta gives you separate encrypted vaults with their own passphrase and master key, coloured spaces inside a vault, groups that nest as deep as your infrastructure actually does, tags across the hierarchy, favourites, an archive and a 30-day trash — with ranked search over the entry name, issuer, account name, tags and full group path. If you are managing a couple of hundred accounts across clients and environments, that is the difference between a tool and a list.
The second difference is the browser. The KeyNesta web app needs no install and no sign-up, so there is nothing to get approved on a locked-down work laptop. Proton's apps are native, which is better on hardware you control and no use at all on hardware you do not.
Honest gaps: not open source, no independent security audit, no shared or team vaults, no browser extension, no desktop app, and no watch app. 2FA backup and sync covers the backup side, and features lists what is shipped and what is not.
Sources
- Proton — Authenticator product page
- Proton — Authenticator downloads
- Proton blog — the Authenticator security model
- KeyNesta — everything it does, and what it does not
Frequently asked questions
Do I need a Proton account to use Proton Authenticator?
Not to generate codes — Proton states the app works without an account. An account is what enables end-to-end encrypted sync across devices. KeyNesta is the same shape: no account to start, and an optional sync account if you want more than one device.
Which has wider platform coverage?
Proton, clearly. It ships iOS, iPadOS, Apple Watch, macOS, Windows, Linux and Android apps. KeyNesta is a web app today, with iPhone and Android builds waiting on store review and no desktop application at all.
So why would anyone pick KeyNesta over it?
Two reasons only, and they are narrow. Proton Authenticator gives you a list; KeyNesta gives you vaults, spaces, nested groups and tags. And Proton has no web app, so a locked-down machine you cannot install software on is a machine where KeyNesta works and Proton does not.
Try KeyNesta free. The web app needs no sign-up.
Open the web app All platforms