Answers to the questions we get most about installing Casement, extensions, the password vault and cross-device sync. If none of these fit, email us — a person reads every message.
Bug reports, install trouble, account questions. We reply within two business days.
support@casement.devData deletion requests and vulnerability disclosures go to the security inbox.
privacy@casement.devStep-by-step first-launch guide for unsigned builds.
Sign in, connect providers, or disconnect a synced account.
What stays on your Mac and what leaves it.
Every error below is a Gatekeeper or download issue on Apple Silicon Macs, not a broken build. Match the message macOS showed you, then follow the fix.
Why: macOS attached the com.apple.quarantine flag to the download and the extended attribute survived unzipping. The app itself is intact.
Fix: Move Casement.app into /Applications first, then strip the quarantine flag and launch normally.
xattr -dr com.apple.quarantine /Applications/Casement.appWhy: Gatekeeper is asking for a first-launch confirmation. This appears when the notarization ticket is not yet stapled to the copy you downloaded.
Fix: Right-click (or Control-click) Casement in /Applications, choose Open, then confirm Open in the dialog. macOS remembers the choice for every later launch.
Why: The block came from Gatekeeper policy rather than the app, so the standard dialog hides the Open option.
Fix: Click Cancel, open System Settings › Privacy & Security, scroll to Security and press Open Anyway next to Casement, then launch it again and confirm.
Why: The bundle was copied with a tool that dropped extended attributes or symlinks — unzipping with a third-party archiver is the usual cause.
Fix: Delete the extracted copy, re-download the signed Apple Silicon DMG, and drag the app from the mounted disk image into /Applications using Finder.
codesign -dv --verbose=4 /Applications/Casement.appWhy: An Intel Mac is trying to run the Apple Silicon build. Casement ships arm64 only from v1.8.0 onward.
Fix: Check › About This Mac. If the chip is Intel, Casement cannot run on that machine — Apple Silicon (M1 or later) is required.
Why: A partial download leaves a truncated image. The published SHA-256 digest will not match.
Fix: Verify the digest against the value listed on the download section, and re-download if it differs.
shasum -a 256 ~/Downloads/Casement-arm64.dmgWhy: The vault is sealed to the Keychain by the app signature; a replaced or re-signed copy is treated as a different app.
Fix: Choose Always Allow at the prompt. If it keeps repeating, remove the old Casement copies from /Applications so only the signed build remains.
Still stuck? The install help page walks through a clean reinstall, or email support@casement.dev.
That is Gatekeeper's quarantine flag on a build downloaded from the web, not a broken file. Right-click the app and choose Open, or run the unquarantine helper. The Install help page walks through both routes step by step.
macOS 11 Big Sur or newer on an Apple Silicon Mac (M1 or later). Intel Macs are not supported — About This Mac shows which chip you have.
Yes. Casement loads unpacked MV2 and MV3 extensions and keeps a copy in its own Extensions folder so they persist across launches. Open Settings › Extensions, add the folder, then reload.
In a vault encrypted with Electron safeStorage and sealed to your macOS Keychain, so the file cannot be opened on another Mac. Cloud vault sync is end-to-end encrypted with a passphrase that never leaves your machine.
No. The passphrase is never transmitted or stored by the service, which is what keeps synced vault items private. Encrypted backups exported from Settings › Vault are the only recovery path.
The assistant is off everywhere until you allow a domain. Manage the allowlist in Settings › Assistant; removing a domain immediately stops both form fill and page context fetching for it.
Casement checks a signed release manifest, verifies the SHA-256 digest, and swaps the app atomically. The request carries only your version and CPU architecture. You can disable automatic checks in Settings › Updates.
Sign in, open Account, and choose Delete account. Synced favorites, history and vault rows are removed; local data stays on your Mac until you clear it in Settings › Browsing data.