Support

Questions, bug reports, feature requests: tmh@possibility.com

When reporting a problem, please include your Chrome version (chrome://version), what you clicked or pressed, and what you expected to happen — never include the actual values you were verifying. A screenshot helps, but check it doesn't show sensitive numbers before sending.

Quick answers

The keyboard shortcut does nothing.

Check it's actually bound at chrome://extensions/shortcuts — Chrome silently leaves it blank if another extension claimed the combination. On a Mac, also make sure macOS itself doesn't own it (System Settings → Keyboard → Keyboard Shortcuts). The shortcut can't work on Chrome's own pages (chrome://…, the Web Store) — use the toolbar button or right-click menu there. For files opened from disk, enable "Allow access to file URLs" on the extension's card in chrome://extensions.

What is ⇧⌘Space?

That's Shift + Command + Space — Chrome shows Mac shortcuts as symbols. ⇧ is Shift, ⌘ is Command, ⌥ is Option, ⌃ is Control.

There's no Compare button.

An empty field opens in input mode, which is two steps: step 1 enters the value, step 2 re-types it blind — Compare appears in step 2. A field that already has a value opens in verify mode with Compare on the first screen.

The field turned blue, not green.

Blue in step 1 means "the format looks right" — the value isn't confirmed yet. Green is reserved for an actual match between your two independent entries.

"Microphone access is blocked" when using Speak it.

Chrome's microphone prompt names the website you're on — that's how browsers attribute extension features running in a page. Allow it once per site. If it was dismissed or blocked, click the mic icon in the address bar or check chrome://settings/content/microphone. On a Mac, also confirm Chrome itself is allowed under System Settings → Privacy & Security → Microphone.

It's listening but says it didn't hear anything.

Chrome is probably using a different microphone than the one you're speaking into — common with Bluetooth earbuds. Check System Settings → Sound → Input (does the level meter move when you speak?) and Chrome's device choice at the top of chrome://settings/content/microphone. Start reading the digits as soon as "Listening" appears, and read digit by digit.

"Couldn't capture this page" when scanning a screen region.

Screen scanning uses the one-time page access Chrome grants when you open Double Check with the shortcut, the right-click menu, or the toolbar button. Re-open it one of those ways, or paste a screenshot instead (⌘V / Ctrl+V works in any entry step).

The read-aloud speaker button is missing.

It appears in verify mode and on the green match screen — not during blind entry, where hearing the value would defeat the purpose. If it's disabled with a "no local voice" note, your device has no on-device voice; network voices are deliberately never used.

Something looks stale after an update.

Reload any tabs that were open before the update — a page keeps running the code it loaded originally.

Where is my license? I switched computers.

Open the toolbar popup → "already paid?" and log in with the email you used at purchase. Subscriptions are managed from Settings → License → Manage subscription.

Does Double Check see my account numbers?

The values you verify are processed only on your device and are never transmitted, logged, or stored — see the privacy policy. The verification log records that a check happened, never the value.