Quarry Focus blocks the apps you actually reach for during a work session and logs where the time went, without shipping any of it off your phone.
Preview
Written descriptions of each screen — we do not host screenshot images for this listing.
About this app
Quarry Focus is a focus timer with teeth. You define a session, pick which apps and sites get blocked while it runs, and the app enforces it through Android's accessibility service — including a lockout mode that makes the block genuinely hard to dismiss rather than one tap away. When the session ends you get a plain breakdown of where attention actually went, computed on the device. No usage data leaves the phone, because the app has no server to send it to.
It is built for people who already know what distracts them and want a mechanism rather than encouragement. There are no streaks, no badges, and no social accountability features. The flip side is that Quarry Focus asks for the accessibility permission, which is one of Android's most powerful, and it is reasonable to be suspicious of any app that requests it — the collective's answer is that the app has no network permission at all, so the accessibility data physically cannot go anywhere.
Tidepool Collective distributes through Google Play and F-Droid. The collective has not completed APKBrowse publisher verification, so this listing is maintained from public announcements and cross-checked against published checksums rather than a direct attestation. There is no authorized direct APK; the download listed here is authorized for the F-Droid-signed build only because the collective's release process publishes that artifact openly, and APKBrowse serves it with a short-lived signed URL and resumable byte ranges.
Before installing, understand what you are granting. The accessibility service is required for app blocking to work at all, and Android will show a suitably alarming warning when you enable it. Version 1.9.0 requires Android 10 or newer, mostly because earlier versions could not enforce blocking reliably. Note also that lockout mode is difficult to escape by design: if you enable a four-hour session you will not be talking your way out of it, and uninstalling during a session is blocked too. The 1.7.2 build lacks lockout mode, which is why some people prefer it.
What's New in v1.9.0
Open build artifact published for the first time; F-Droid listing tracks the same tag.
- Lockout mode that resists early cancellation
- On-device attention breakdown after each session
- Blocking now covers browser tabs by domain
Version history
Jun 28, 2026 · 11.3 MB · Android API 29–35 · code 190
Open build artifact published for the first time; F-Droid listing tracks the same tag.
- Lockout mode that resists early cancellation
- On-device attention breakdown after each session
- Blocking now covers browser tabs by domain
SHA-256 e58024fb3ca917d6402e8b1f7059cd63a1847e0fb92d3c65108ae7b4d29f0c31
Feb 11, 2026 · 10.1 MB · Android API 29–34 · code 172
Last build before lockout mode; still available at user request via the store listing.
- Session scheduling by day of week
- Fixed blocking gaps during screen rotation
SHA-256 9143ce0b7d258af6013e94b2c806df571ae2f3609b8d4a7c25e0fb1836ad94c7
Will it run on your device?
82%
- Targets newer Android builds, so legacy devices may be excluded.
- Multiple CPU architectures are covered.
- Optimized for more than one screen class.
- Aligned with the latest Android target SDK expectations.
Quarry Focus questions, answered
Is it safe to give Quarry Focus accessibility access?
The accessibility service is what makes app blocking work, and there is no way to implement it on Android without that permission. The mitigating fact is that the app declares no internet permission, so anything it observes cannot be transmitted anywhere — you can verify that yourself by inspecting the manifest.
How do I verify the download is genuine?
Compare the SHA-256 of the file against the hash listed for that version here, which matches the checksum the collective publishes with each release. The signing fingerprint is stable across every version, so a build with a different signer is not theirs.
Will Quarry Focus work on my Android version?
Version 1.9.0 requires Android 10 (API 29) or newer, because reliable app blocking depends on APIs that arrived in that release. It ships arm64-v8a and armeabi-v7a binaries and works on phones and tablets.
Can I cancel a lockout session early?
Not easily, and that is the entire point of the mode. Uninstalling is blocked during an active lockout session, so the realistic escape is rebooting into safe mode — treat lockout as a commitment rather than a suggestion.
How do I roll back to a version without lockout mode?
Version 1.7.2 predates lockout mode and installs cleanly since the signing key has not changed, but you must uninstall 1.9.0 first and no lockout session can be active when you do. Your session history will not carry over.
Installation Guide
Open Settings on your Android device
Go to Security → Unknown sources (or Install unknown apps)
Enable "Allow from this source" for your browser or file manager
Open the downloaded APK file from your Downloads folder
Tap "Install" and wait for installation to complete
Launch the app from your home screen
Make sure to re-enable Unknown Sources restrictions after installation for security.
How to install this safely
How to verify the file you downloaded
Before you install anything, confirm the file is the one described here. On a computer, run shasum -a 256 your-download.apk (macOS or Linux) or certutil -hashfile your-download.apk SHA256 (Windows), then compare the output character-for-character with the SHA-256 on this page. If a single character differs, the file is not the build we recorded — delete it.
What the signing certificate proves
Every Android app is signed with a private key that only its developer holds. The fingerprint on this page is a hash of the matching public certificate, and it proves continuity rather than identity: it tells you a build came from whoever signed the earlier ones. Android enforces this at install time — if a package claiming to be com.tidepool.quarryfocus is signed with a different key, the system will refuse to install it over your existing copy. A fingerprint that changes between releases is worth pausing on, because a repackaged app that has been modified by someone else cannot keep the original signature.
How to roll back to an earlier version
If the current release misbehaves, 1.7.2 is the last build before it. Android will not install an older version code over a newer one, so you must uninstall Quarry Focus first — which clears its local data unless you have a backup. Reinstall the older APK only if its signing fingerprint matches the build you already trust, and check the API range: an older release may target an Android version your device has moved past.
Why we list sources instead of hosting everything
The official store channel is almost always the right choice: it updates automatically and carries the publisher's own distribution guarantees. A direct APK is useful when a device has no store access, when a rollout has not reached your region, or when you need a specific version — and only when the publisher has authorized that copy. APKBrowse does not list pirated, cracked, or unauthorized rebuilds of Quarry Focus, and a listing is removed when the evidence for it stops holding up.
Get Quarry Focus
Every source we list for com.tidepool.quarryfocus is legality-reviewed. Pirated or cracked builds are never offered.
Publisher-authorized · resumable transfer
Other sources
F-Droid listing
officialBuilt from source by F-Droid and signed with the F-Droid key.
We check legality and signature continuity, but device behaviour still varies. Install at your own discretion.
App Information
Security Verification
We record provenance; we do not run malware scans. Verify the hash yourself before installing.
SHA-256 Hash
e58024fb3ca917d6402e8b1f7059cd63a1847e0fb92d3c65108ae7b4d29f0c31
Signing certificate
6C:B0:35:D9:81:47:2E:AA:15:73:9F:60:C4:18:5B:E2:07:D3:49:1F
Permissions Required
Previous Versions
The signing certificate fingerprint for this release is on record, so a build that does not match it did not come from this publisher.
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