Comparison

Ultradian vs one sec | screen time + focus

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

Head to head
About

Ultradian

Leverage your natural energy cycles for optimal task management and rest. This app analyzes biometric data to predict your ultradian rhythms, helping you schedule demanding activities during peak energy and breaks when needed.

Highlights
  • Analyze biometric data
  • Predict ultradian rhythms
  • Schedule peak task times
  • Schedule rest breaks
  • Connects to Apple Health
Features
Read full description

Experience peak productivity and well-timed rest with Ultradian, the app designed to help you leverage your natural energy cycle. By securely connecting to Apple Health, Ultradian analyzes your biometric data to predict your daily ultradian rhythms—empowering you to plan tougher tasks when you’re at your peak and schedule breaks when you need them most.

About

one sec | screen time + focus

This app introduces a brief pause before opening distracting applications, encouraging mindful choices about attention. It scientifically helps reduce screen time by an average of 57% by adding friction to habitual app usage.

Highlights
  • Delayed app access instead of blocking
  • Reduces screen time by 57% on average
  • Doom Scroll Emergency Brake (Re-Intervention)
  • Works with any app, including social media and games
  • Safari extension for website interruptions
  • Integrates with Structured and LENGO
  • Mindful moments via HealthKit
Features
Read full description

Stop opening social media on autopilot. one sec adds a short pause before distracting apps so you can choose what deserves your attention. 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 is 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/

Screenshots

Ultradian4 screens
one sec | screen time + focus4 screens

Verdict

The call

The clearest difference is rating: one sec | screen time + focus at 4.8 against Ultradian's 3.3. one sec | screen time + focus also leads on update cadence (fortnightly vs every 5 months) and ratings volume (24K vs 4). Ultradian's advantage is in-app purchases (none vs 6) and review sentiment (100% vs 76%). On price and ads 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. Ultradian 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 3.3. That said, the two scores are not equally well evidenced: one sec | screen time + focus has 24K ratings behind it against 4, so its average is the more settled of the two. Written reviews complicate that: 100% of Ultradian's written reviews are positive against 76% of one sec | screen time + focus's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

Ultradian ships an update every 5 months, one sec | screen time + focus fortnightly. The most recent releases landed on October 29, 2026 and November 3, 2026 respectively.

Scorecard8 real differences · 2 level
Ultradian versus one sec | screen time + focus: the parameters behind the verdict, then further details
ParameterUltradianone sec | screen time + focus
PriceFreeFree
Rating3.3 (4 ratings)4.8 (24K ratings) — better
Positive reviews100.0% of reviews — better75.8% of reviews
Number of ratings424K — better
Update frequencyEvery 5 monthsFortnightly — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhoneiPhone, iPad, iPod, Mac — better
Requires iOS17.515.0 — better
Further details — not scored
Size7 MB413 MB
Age rating4+4+
DeveloperKatherine Grataleriedel.wtf apps S.L.

Customer experience

Ultradian

All ratings3 ratings
Positive66.7%
Neutral0.0%
Negative33.3%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

one sec | screen time + focus

All ratings23,787 ratings
Positive95.9%
Neutral1.5%
Negative2.5%
Written reviews1,636 reviews
Positive75.8%
Neutral9.4%
Negative14.8%

Bugs and requests

Ultradian

Not enough reviews yet to summarise bugs or 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)

In-app purchases

None

Ultradian

No 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

Questions

Is Ultradian free?
Ultradian is free to download, with no in-app purchases.
Is one sec | screen time + focus free?
one sec | screen time + focus is free to download, with in-app purchases available.
Which has better reviews, Ultradian or one sec | screen time + focus?
one sec | screen time + focus is rated higher. Ultradian averages 3.3 out of 5 from 4 ratings, while one sec | screen time + focus averages 4.8 from 24K ratings.
Do Ultradian or one sec | screen time + focus have ads?
Neither Ultradian nor one sec | screen time + focus shows ads.
Which is updated more often, Ultradian or one sec | screen time + focus?
Ultradian ships an update every 5 months, and one sec | screen time + focus fortnightly. Most recently, Ultradian was updated on October 29, 2026 and one sec | screen time + focus on November 3, 2026.

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