You are twenty minutes into a study session when the screen goes dark. Or you flip the phone face-down so the glow stops pulling at the edge of your vision. Either way, the same thought tends to arrive: did the timer just die? Most focus tools treat a sleeping screen as the end of the session, so the question is fair. Locked In, a focus companion with the subtitle "Study with me, on demand," answers it in one line from the current listing: "Your phone can sleep; the session keeps going."
That promise is the reason this piece exists. People who study with phone locked mid-session are not looking for a new scoreboard. They want to know whether the work they already started is still running while the display rests. Locked In says yes, and the rest of the app is built around keeping that quiet company going without asking you to stare at a bright rectangle for an hour.
What stays alive when the screen sleeps
The practical question behind study with phone locked is simple. Can you glance at the lock screen and still see how much time is left, without opening the app and breaking the spell? Locked In uses Live Activity so your timer lives on your lock screen. The session itself does not depend on the display staying awake.
That is a different design choice from a timer that only runs while the app is in the foreground. Here, the phone can dim, lock, or sit face-down on the desk, and the countdown continues. If you need a quick check, the Live Activity is already there. You do not have to open the phone, hunt for the app icon, and risk getting pulled into a message thread you did not mean to open.
Your phone can sleep; the session keeps going.
Live Activity is the piece that makes that line feel real rather than hopeful. It is also the piece most people miss when they assume every focus timer dies with the backlight. Once you have seen the timer still sitting on the lock screen after the display has gone dark, the habit of flipping the phone over starts to feel safe instead of risky. The session keeps its place. You keep yours.
What a Locked In session actually is
Locked In is not a video call and not a matching lobby. The listing describes ambient companion sessions that feel like working next to someone. No matching, no waiting, no video. Just tap start. You get the sense of company without a camera, a schedule, or a stranger on a video call, which is the whole point for people who want presence without performance.
Before you begin, choose your vibe: Quiet Library, Rain Desk, Cafe, Late Night. Each one sets a different atmosphere for the same underlying session: a timer, ambient company, and the option of gentle voice check-ins to keep you company and on track. The check-ins are there when you want a soft reminder that you are still in the block. They are not a coach shouting through a headset, and they do not require you to answer out loud.
Session length is flexible. Any session length — 25, 50, or your own — so a short review pass and a long deep-work stretch can use the same tool. You pick the length when you start, then you can put the phone away and trust that the timer and the companion layer keep running. That is what it means, in practice, to focus when phone sleeps: the session was set before the screen went dark, and nothing about sleep undoes it.
Version 1.0, released on 6 August 2026 after a first release the day before, is the live build this article describes. There is no What's New section to chase. The listing's sleep and Live Activity lines are already in that version, which is why they are worth writing about now rather than waiting for a later update.
Free forever, and what membership adds
Locked In does not hide the free tier behind a preview. Free forever: full timer, one vibe, streaks, logging, widget. That is enough to run real sessions, keep a streak, and log what you did, without needing a membership just to find out whether the timer survives sleep. You can learn the rhythm on one vibe and decide later whether you want more atmospheres.
Go further with Locked In membership: every vibe, new packs as they drop, and streak insights. The free tier keeps one vibe; membership opens the rest and the packs that arrive later. This article does not list prices or trial lengths. The useful distinction is simply which parts stay free and which parts expand with membership, so you can choose without guessing what the timer itself can do.
The home screen widget deserves a clear sentence of its own. It is a home screen widget that quietly guards your streak. It does not start a session. If you want to begin a new block, you open the app and tap start the same way you always would. The widget's job is the quieter one: keeping the streak visible so a sleep-friendly timer does not become a forgotten habit on a busy week.
Why sleep-friendly focus matters mid-session
The fear that the timer dies is rarely about the tool itself. It is about the cost of restarting. You have already sat down, cleared a corner of the desk, and found the first page of the reading. If putting the phone away seems to cancel the block, you keep the screen on, and the screen becomes another thing competing for attention. Study with phone locked only works when the tool treats sleep as part of the plan rather than an interruption.
Locked In's answer is the one already quoted above. The phone can sleep. The session keeps going. Live Activity covers the glance. The ambient companion layer covers the sense that you are not working in a vacuum. The path stays the one the listing names: tap start, choose length and vibe, then let the phone rest while you work.
What survives sleep, and what you choose first
Once a session is running, the worry shrinks into a routine. The screen can go dark. The phone can sit face-down. You can walk to the kitchen and come back without wondering whether the block reset itself. What you still decide, before any of that, is the shape of the session you are about to trust.
The timer keeps counting while the display sleeps, so the block you started is still the block you are in.
Live Activity keeps the remaining time on the lock screen, which answers the glance without opening the app.
The ambient companion session itself continues — no matching, no waiting, no video — for as long as you set it to run.
Before you begin, you still choose the vibe and the length: Quiet Library, Rain Desk, Cafe, or Late Night, and 25, 50, or your own duration.
That split is worth holding onto. Sleep does not cancel the session. It also does not choose the vibe or the length for you. Those choices happen at the start, in the calm moment before the phone goes face-down, and then the listing's promise takes over: your phone can sleep, and the session keeps going. For anyone who has abandoned a half-finished block because they were afraid the timer had died, that is the whole argument for trying Locked In on a real study afternoon.
This article was drafted with AI assistance and reviewed by a human editor before publishing.