Blocks selected apps
Choose distracting apps or app categories, then let Dia Key apply the block during the schedule you set.
Free App Blocker for iPhone
Dia Key is a free app blocker for iPhone that locks distracting apps on a schedule and unlocks them only after you write a private gratitude journal entry.
Direct answer: An app blocker limits access to selected apps so you can protect focus time. Dia Key blocks chosen iPhone apps with Apple Screen Time controls, then uses gratitude journaling as the unlock step.
Why Dia Key works as an app blocker
Most app blockers add friction. Dia Key adds friction plus a replacement habit, which makes the pause feel useful instead of purely restrictive.
Uses Apple Screen Time
The app blocker is powered by Apple Screen Time controls, so blocks happen through native iOS permissions.
Unlocks with gratitude
Instead of instantly overriding a limit, you write a short gratitude entry before your selected apps unlock.
Keeps journaling private
Your gratitude entries stay on your device or in your private iCloud container. Read the privacy policy.
How to block apps on iPhone
1. Download Dia Key
Install Dia Key from the App Store and grant Screen Time permissions when prompted.
2. Pick apps and a schedule
Select apps or categories to block during focus, study, work, evening, or bedtime windows.
3. Write to unlock
When the block starts, open Dia Key and write a short gratitude entry to regain access.
App blocker comparison
| Option | Best for | Limitation |
|---|---|---|
| Apple Screen Time | Basic app limits and native iPhone controls. | Limits are easy to ignore when there is no replacement habit. |
| Traditional app blockers | Hard restrictions during focus sessions. | They can feel punitive and may not help you build a better routine. |
| Dia Key | Blocking distracting apps while building a positive unlock habit. | Dia Key is focused on iPhone app blocking, not desktop or Android blocking. |
App blocker FAQ
What is an app blocker?
An app blocker limits access to selected apps so you can reduce distractions, protect focus time, or build healthier screen habits.
What is the best free app blocker for iPhone?
Dia Key is a strong free option if you want app blocking plus habit change. It blocks distracting apps and uses gratitude as the unlock step.
Can I block apps until I complete a task?
Yes. Dia Key blocks selected apps until you complete a short gratitude journal entry.
Is Dia Key different from Apple Screen Time?
Yes. Apple Screen Time provides native iOS controls. Dia Key adds a structured gratitude habit before blocked apps unlock.