Comparison

one sec | screen time + focus vs Keynius

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

one sec | screen time + focus

This app introduces intentional friction to distracting apps and websites, helping users reduce screen time and improve focus. It delays access rather than blocking, promoting long-term behavioral change. Integrates with other apps for enhanced productivity.

Highlights
  • Adds friction to distracting apps
  • Delays app access instead of blocking
  • Reduces app usage significantly
  • Doom Scroll Emergency Brake (Re-Intervention)
  • Free Safari extension for websites
  • Integrates with other productivity apps
Features
Read full description

Willpower is not enough against social media algorithms! That’s why I made one sec: one sec adds friction to distracting apps to make them less appealing…long-term! This principle works really well: we have gained scientific evidence in numerous research studies with the Max-Planck Institute, with the German and Danish government, and in dozens more scientific collaborations: one sec has incredible effects on your screen time: app usage drops by 57% on average! …just read our App Store reviews or try it for yourself if you don’t believe me (…you should really try it)! How is one sec different from Screen Time limits or app blockers? - one sec DELAYS access to distracting apps instead of blocking apps completely – that’s an important difference psychologically. - This way, we solve the screen time problem at its roots: long-term & sustainably! - one sec is always on, and makes using social media just slightly more annoying…so you’ll end up using it only when you actually have a reason! Which apps can I use with one sec? - You can set up one sec with any app you’d like to use less / more intentional. - Most popular use-cases are: social media, games, video streaming, dating, stock/coin trading, adult content. - Using one sec with one app of your choice if completely free, for more you’ll need to purchase one sec pro (we also need to finance development of our app!). What if I get stuck scrolling? - No worries, one sec offers a Doom Scroll Emergency Brake: We call it Re-Intervention. - After a set time (e.g. 5 minutes) you’ll be kicked out of social media, and you’ll have to go through an intervention again to unlock more time. Where can I learn more about the scientific background of one sec? → https://one-sec.app/research Can I use one sec to interrupt access to websites as well? → Yes, one sec offers a free Safari extension as well. How does one sec work technically? - one sec uses Shortcuts Automation to toggle a deep breath animation whenever you open one of the configured apps (Instagram, Twitter, YouTube…). - This breaks unconscious social media habits short-term (literally, as soon as you have set it up) and even helps long-term by adding more friction when opening these apps. Integrations: - Structured: one sec blocks apps during unfinished tasks. - LENGO: learn vocabulary to unlock social media. I developed one sec for myself in 2020…and it worked so well I decided to upload it to the App Store. Especially for people with ADHD one sec is a great tool to gain back control for incredible focus and concentration. – Frederik Legal information: Available Subscription Options: one sec pro (annual / monthly / lifetime unlock) one sec can contribute mindful moments to the Health App via HealthKit. one sec is covered by U.S. Patent 12,468,828 B2. Terms (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://one-sec.app/privacy/

About

Keynius

Manage and control lockers for various purposes, from personal storage to asset management. Reserve, open, and get notified about locker usage periods all within a single, user-friendly application.

Highlights
  • Find available lockers
  • Reserve lockers
  • Open lockers
  • Locker usage notifications
  • Light and dark mode
Features
Read full description

Lockers are great for storing your personal or work items. At school, in the office, in the dressing room at the gym, or maybe when riding a roller coaster in an amusement park. And that’s only the beginning because lockers can also be of great use as drop-off/pick-up points, for asset management, vending company assets, and many, many more applications. But… there’s no fun in it if you can’t control your lockers in a super simple and super safe way! That’s why you’ll want Keynius: open your locker or reserve a new one, borrow company assets, rent items, etc. all with one app. Check out if your (desired) locker is using Keynius control and start using this great app now! Key features: - Find available lockers - Reserve your locker - Open your locker - Get notified when your locker usage period ends Available in light and dark mode

Screenshots

one sec | screen time + focus4 screens
Keynius3 screens

Verdict

The call

The clearest difference is review sentiment: one sec | screen time + focus at 76% against Keynius's 0%. one sec | screen time + focus also leads on rating (4.8 vs 2.0) and ratings volume (24K vs 1). Keynius's advantage is in-app purchases (none vs 6). On price, update cadence, ads and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. one sec | screen time + focus sells 6 in-app purchases, starting at $6.99 per month. Keynius asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

one sec | screen time + focus holds the better App Store score, 4.8 against 2.0. That said, the two scores are not equally well evidenced: one sec | screen time + focus has 24K ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 76% of one sec | screen time + focus's written reviews are positive against 0% of Keynius's.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 2 weeks. The most recent releases landed on October 16, 2026 and October 5, 2026 respectively.

Scorecard5 real differences · 5 level
one sec | screen time + focus versus Keynius: the parameters behind the verdict, then further details
Parameterone sec | screen time + focusKeynius
PriceFreeFree
Rating4.8 (24K ratings) — better2.0 (1 ratings)
Positive reviews75.8% of reviews — better0.0% of reviews
Number of ratings24K — better1
Update frequencyEvery 2 weeksEvery 2 weeks
AdsNoNo
In-app purchasesYesNo — better
MonetizationFreemiumFree — better
DevicesiPhone, iPad, iPod, Mac — betteriPhone, iPad, iPod
Requires iOS15.0 — better15.5
Further details — not scored
Size367 MB63 MB
Age rating4+4+
Developerriedel.wtf apps S.L.Keynius B.V.

Customer experience

one sec | screen time + focus

All ratings23,626 ratings
Positive96.0%
Neutral1.5%
Negative2.5%
Written reviews1,621 reviews
Positive75.8%
Neutral9.4%
Negative14.7%

Keynius

All ratings1 ratings
Positive0.0%
Neutral0.0%
Negative100.0%
Written reviews1 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

Bugs and requests

one sec | screen time + focus

Reported bugs

4 issues
  • App switching issues
  • Interventions not triggering properly
  • Inconsistent behavior with shortcuts
  • Crashes and freezes on certain devices

Requested features

6 requests
  • Ability to block more apps for free
  • Customizable intervention timers
  • Scheduled app blocking/access
  • Passcode protection for settings
  • Sync settings across devices
Show 1 more
  • More intervention types (e.g. games)

Keynius

Not enough reviews yet to summarise bugs or requests.

In-app purchases

6 purchases

one sec | screen time + focus

Subscriptions4
  • one sec pro (1 Month)$6.991 Month
  • one sec pro | Family Plan (1 Month)7 Days trial$9.991 Month
  • one sec pro (1 Year)7 Days trial$19.991 Year
Show 1 more
  • one sec pro | Family Plan (1 Year)7 Days trial$29.991 Year
One-time2
  • one sec pro | Lifetime$99.99
  • one sec pro | Family Lifetime$149.00
None

Keynius

No in-app purchases

Questions

Is one sec | screen time + focus free?
one sec | screen time + focus is free to download, with in-app purchases available.
Is Keynius free?
Keynius is free to download, with no in-app purchases.
Which has better reviews, one sec | screen time + focus or Keynius?
one sec | screen time + focus is rated higher. one sec | screen time + focus averages 4.8 out of 5 from 24K ratings, while Keynius averages 2.0 from 1 ratings.
Do one sec | screen time + focus or Keynius have ads?
Neither one sec | screen time + focus nor Keynius shows ads.
Which is updated more often, one sec | screen time + focus or Keynius?
one sec | screen time + focus ships an update every 2 weeks, and Keynius every 2 weeks. Most recently, one sec | screen time + focus was updated on October 16, 2026 and Keynius on October 5, 2026.

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