one sec | app blocker, focus

In-app purchases
4.6
38.5K reviews
1M+
Downloads
Content rating
Everyone
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About this app

one sec forces you to take a deep breath whenever you open distracting apps.

It’s as simple as effective: You will reduce your social media usage just by becoming aware of it. one sec is the focus app that tackles the problem of unconscious social media use at its root. It is designed to change your habits on a long-term basis.

one sec works so great because it is fully automated – and forces you to reflect on your actions – while they happen.

🤳 Balanced social media use
App usage drops by 57% on average thanks to one sec – proven by science!

🧑‍💻 Productivity
Having two more weeks per year not spent on social media – to work on your projects & to recharge!

🙏 Mental health
High social media usage is often related to depression and anxiety symptoms.

⚡️ ADHD relief
Users praise one sec as the “holy grail for ADHD relief”.

🏃 Sports
Studies have shown that reduced social media use leads to increased sport activity.

🚭 Quit smoking
Studies have shown that reduced social media use leads to reduced smoking behavior.

💰 Save money
Prevent impulse purchases with one sec.

🛌 Sleep better
Prevent scrolling mindlessly before you go to bed and right after waking up.

With one sec, you‘ll notice both a short-term and long-term effect on your social media usage:

1. Unconscious phone habits are prevented right away (“Why did I even want to open that app?”) and
2. Long-term habits change because these apps appear less appealing to your brain (their “dopamine on demand” effect fades away).

one sec is also available for your desktop web browser: https://tutorials.one-sec.app/browser-extension-installation

We have made one sec free to use with one app!

If you would like to use one sec with multiple apps, please upgrade to one sec pro. You’ll also get access to lots of additional features and customization options.

This effect has been confirmed in a study with the University of Heidelberg and Max Planck Institute where we detected a reduction of social media usage by 57% thanks to one sec. Read our peer-reviewed paper: https://www.pnas.org/doi/10.1073/pnas.2213114120

Accessibility Service API
This app uses the Accessibility Service API to detect and intervene user-selected target apps. We do not collect personal information, all data remains offline and on-device.

Privacy policy: https://one-sec.app/privacy/
Imprint: https://one-sec.app/imprint/
Updated on
Jan 2, 2026

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
No data shared with third parties
Learn more about how developers declare sharing
No data collected
Learn more about how developers declare collection

Ratings and reviews

4.6
37.9K reviews
Jamie Volle
July 3, 2025
was great a few months ago, not worth it now. It just did the intervention on me when I was actively reading an article. Also I can't choose how long to be on an app anymore like I could a few months ago. They stuck, bottom of the barrel, basic features behind a paywall which sucks. My doc and therapist thought it was super neat and asked me what it was and then started recommending it to their clients. Now we are on the hunt for a new one instead and they have stopped recommending it.
17 people found this review helpful
Did you find this helpful?
riedel.wtf
September 8, 2025
Hi Jamie, we want everyone to get the most out of our app – if you can’t afford it we will find a solution. Please reach out to support@one-sec.app Also, I wanted to emphasize that we never took away free features – everything that used to be free is still free.
Julia Markowski
January 30, 2026
good idea, but needs work. it keeps me from mindlessly opening apps, but it also pops up while I am deliberately using an app, eg on YouTube, when I am trying to open comments, save a video to a list or even just rotate my phone to watch a video on full screen, which is very annoying, especially bc YouTube will just minimize and keep playing over the app popup.
Did you find this helpful?
riedel.wtf
January 30, 2026
Hi Julia, please get in touch with our customer support! We'll do our best to help you to make one sec work on your device and help you as much as possible.
Anna M
December 27, 2025
I like this app and have considered paying for the premium features. The concept is great and it helps me. I have noticed it will pop up while I'm just using a different part within the app I'm using (since I use it for FB if I go to the marketplace, comments on reels, or sometimes even messenger). It will pop up if I go to adjust my brightness or sound in the pull down menu when I'm not closing out of the app. Overall would to pay if these minor things were fixed up. My phone is a s23 ultra
5 people found this review helpful
Did you find this helpful?
riedel.wtf
December 29, 2025
Hi Anna, please get in touch with our customer support! We'll do our best to help you to make one sec work on your device and help you as much as possible.

What’s new

- Improved permission related onboarding experience for Xiaomi devices.
- Addressed an issue where some keyboards could trigger one sec’s interruption to appear incorrectly (during the use of target apps). Sorry about the trouble, now one sec should work smoothly again!