Block distractions.
Unlock your life.
Block the apps stealing your time, then lock the session so you cannot talk yourself out of it.
On iPhone or Mac? Join the iOS waiting list
You open Instagram for 2 minutes. 1 hour later, you're still scrolling.
It's not your fault. These apps are engineered to hijack your attention. And every "screen time reminder" is just another notification you swipe away.
Endless scrolling
You meant to check one notification. Now it's been an hour.
Source: DataReportal, Digital 2024
Broken focus
Every ping pulls you out of deep work. Getting back takes 23 minutes.
Source: Mark et al., UC Irvine (2008)
Promises you can't keep
"I'll only use it for 5 minutes." Sound familiar?
Source: Common Sense Media
You've tried app blockers before. They didn't work.
Every blocker on the market has the same fatal flaw: they trust your willpower. But willpower is exactly what fails when you're craving a dopamine hit at 11pm.
"Just disable it"
Most blockers let you turn them off in seconds. One tap and you are back to scrolling.
"Just uninstall it"
You can remove the blocker app itself. Nothing stops you, so nothing changes.
"Are you sure?" prompts
A gentle reminder has never stopped anyone mid-impulse. You just tap through it.
There's a better way
You choose what gets blocked. Then it stays blocked.
No "are you sure?" prompts. No easy override. When Strict Mode is on, your blocked apps stay blocked until the timer runs out. Period.
- Emergency calls always work
- Nothing leaves your device
- Sessions end on their own
People who took back control
What people say once the apps stop winning.
I deleted Instagram 3 times before finding TiedSiren. Now I can't cheat even if I want to. That's the whole point.
Marc D.
Software engineer
Strict Mode is no joke. I tried everything to get around it during a session — nothing works. My screen time dropped 40% in a week.
Sarah K.
University student
Other blockers are suggestions. TiedSiren is a lock. I schedule a 2-hour block every night and I'm finally reading again.
James L.
Product manager
Everything you need to stay focused
Built for people who are serious about breaking phone addiction.
Strict ModeCore
Lock your session. No pause, no override, no exceptions until the timer ends.
Custom Blocklists
Block Instagram, TikTok, YouTube, or any app. Build lists for work, study, or sleep.
Scheduled Sessions
Set daily or weekly recurring schedules. Your blocks activate automatically.
Focus Timer
Built-in timer for focused work sessions. See exactly how long you've been distraction-free.
Questions & answers
Not from your phone, once a session is running. Blocked apps will not open and the timer will not be shortened. Uninstalling is the one route out, and you close it by adding Settings to your blocklist — which also locks Wi-Fi, Bluetooth and permissions for the session. That trade is yours to make up front, and it is the only decision Strict Mode lets you make.
Yes. It is completely free to download and use, with no credit card required. We may add an optional Pro plan with extra features down the line, but blocking your distracting apps will always be free.
Android's Accessibility Service is what detects the moment a blocked app opens and closes it instantly. It is the only reliable way to enforce strict blocking on Android. It checks which app is in the foreground on your device to enforce your blocks and power your own session stats; it never reads your screen content or sends your activity to anyone.
When no Strict Mode session is active, you can pause blocking or uninstall the app like any other. During a session it stays locked until your timer ends — and if you added Settings to that blocklist, the uninstall screen is locked with it. That is the whole point. Emergency calls and services always work, even mid-session.
Minimal. The app uses Android's accessibility services efficiently and runs lightly in the background. In practice, reducing your screen time saves more battery than the app consumes.
Phone calls and emergency services are never blocked. You can always make and receive calls, send texts, and access emergency numbers regardless of your blocking session.
You need Android 8.0 (Oreo) or higher. That covers over 95% of active Android devices.
Right now you can block apps. Website blocking is on our roadmap. For now, block your browser app entirely during focus sessions.
Absolutely. Your blocklists and session data are stored locally on your device and encrypted in transit when syncing. We never sell your data, and we don't track which apps you use.
Still have questions? Contact us
Ready to take back
your time?
Free. No credit card. Works on Android 8 and up.
Want it on iOS, macOS, or Windows? Join the waitlist for early access.