Best 3 Passkey Support Checkers Compared

Your bank now offers passkeys. Before you switch away from the password you have been using for six years, you would quite like to know whether the browser you are sitting in front of will actually handle one — and ideally to find that out somewhere other than halfway through your bank’s enrolment flow.

This is harder to check than it should be, because “does this support passkeys” is really several questions. Does the browser implement WebAuthn? Does the platform have an authenticator? Will passkeys sync across your devices or stay on this one? Can you use your phone to sign in on a laptop? The answers vary by browser, by operating system version, and sometimes by which password manager you have installed.

How to judge a passkey support check

Does it test this browser or describe browsers generally? A compatibility table tells you what should work. Feature detection tells you what does.

Does it distinguish the capabilities? Basic WebAuthn support, autofill UI, and cross-device authentication are separate things, and a device can have one without the others.

Is it aimed at users or developers? Some of the best resources here are explicitly written for people implementing passkeys, and read that way.

Does it require creating anything? Testing enrolment on a demo site is different from checking capability.

The comparison

Facts checked August 2026; plans can change.

passkeys.dev device support

This is the most complete reference of the three. Maintained by members of the W3C Web Identity and Credentials Adoption Community Group and the FIDO Alliance, it lays out support across Android, Chrome OS, iOS and iPadOS, macOS, Ubuntu, and Windows, broken down by synced passkeys, autofill UI, cross-device authentication, and native app invocation. It also links to a separate feature detection tool at tools.passkeys.dev for testing an actual client.

It carries an explicit warning worth respecting: the page asks not to be linked from end-user-facing resources, because it is aimed at relying party developers. It is a reference for people building passkey support, and it reads that way.

webauthn.io

Built by Duo Labs, webauthn.io is a live demo where you can register and authenticate with a passkey against a real WebAuthn implementation. Nothing beats actually completing the flow for finding out whether your device, browser, and authenticator cooperate — capability tables cannot tell you that your security key firmware is out of date.

The trade-off is that it is a full flow. You are creating a credential on a demo site, which is more commitment than a capability check, and slightly more to clean up afterwards if you like your credential list tidy.

Can I Use: WebAuthn

Can I Use is the familiar answer for any browser API question, and WebAuthn is no exception: browser versions, market share, and known issues in a format most web developers can read at a glance.

Its limitation for this particular question is structural. It tells you whether the API exists in a browser version, which is necessary and not sufficient — a browser can expose WebAuthn on a platform with no usable authenticator, and Can I Use has no way to know about your device’s biometrics, your password manager, or whether passkeys will sync.

Passkey Readiness Checker

Ours answers the narrow, practical question: does the browser you are using right now support WebAuthn-based passkeys? It runs feature detection in your browser and reports what it finds, before you go and try enrolling on a real account. Nothing is created, nothing is stored, nothing leaves the machine.

The limitation is the ceiling on what feature detection can know. It can tell you the platform advertises support; it cannot promise that a specific bank’s implementation will work, that your passkey will sync to your other devices, or that a particular hardware key is compatible. It is a pre-flight check, and a successful one still leaves the actual enrolment to be attempted.

Which one to pick

• If you are implementing passkeys and need the full capability matrix, use passkeys.dev.
• If you want to prove the whole flow works end to end, register a test credential at webauthn.io.
• If you need browser version support for a compatibility decision, Can I Use is the right shape.
• If you just want to know whether this browser is ready before you enrol somewhere real, use ours.

How to do it with Passkey Readiness Checker

1. Open the Passkey Readiness Checker in the browser you actually plan to use.
2. Read the reported WebAuthn and platform authenticator support.
3. If it reports support, go and enrol on the real service — and keep a second sign-in method until you have tested it.
4. More security tools are in the tools directory.

You might also need

• 2FA Setup Checker — for the second factor you should keep as a fallback.
• Password Strength Checker — because the account you have not moved to passkeys yet still needs one.

Frequently asked questions

Is there a free passkey support checker that doesn’t need an account?

Yes. passkeys.dev and Can I Use are free references, webauthn.io is a free demo, and our checker has no accounts because the site has no signup at all.

What exactly is a passkey?

A passkey is a WebAuthn credential — a key pair where the private half stays on your device or in your password manager and the site only ever holds the public half. The FIDO Alliance’s passkey overview explains the model and why it resists phishing in a way passwords cannot.

Will my passkey work on my other devices?

It depends on where it is stored. Synced passkeys held by a platform account or password manager travel with you; device-bound passkeys on a hardware key do not. The passkeys.dev support matrix breaks this down per platform, and it is worth checking before you delete the password.

Final thought

Check the browser before you touch the account. Discovering a compatibility problem on a capability checker costs you thirty seconds; discovering it halfway through your bank’s enrolment flow costs considerably more.

Try the free Passkey Readiness Checker