Comparison

one sec | screen time + focus vs ChalkTimerPRO

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

ChalkTimerPRO

This app provides precision timing for gymnastics competitions, adhering to USA Gymnastics rules. It automates warm-up and competition timing, including fall and bump timers, reducing stress for coaches and meet directors. Features include dynamic time calculation, audio/visual cues, and offline functionality.

Highlights
  • USAG Rules-Based Warm-Up Timing
  • Competition Timing Suite
  • Fall and Bump Timers
  • Dynamic Time Calculation
  • Audio and Visual Cues
  • Offline Reliability (PRO version)
Features
Read full description

Take the stress out of warm‑up and competition timing. ChalkTimer is the precision timing app built for gymnastics competitions. Designed by coaches and meet directors, it follows USA Gymnastics (USAG) Rules & Policies to deliver automatic, rule‑compliant warm‑up timing—no spreadsheets, no volunteers, no stress. And now, ChalkTimer goes even further with fully functional competition timing built right in. Every event. Every scenario. Every timing rule handled automatically. Included in the new Competition Timing Suite: • All event timers for every apparatus • Fall timers for accurate, rule‑compliant deductions • Bump/Touch timers for athlete readiness and equipment adjustments • General stopwatch for flexible timing needs across the meet Whether you’re coaching, judging, or running the meet, ChalkTimer keeps your event moving with clarity, fairness, and confidence. --- For Coaches: More Time to Coach, Less Time on the Clock Coaches shouldn’t be juggling stopwatches or second‑guessing timing rules. ChalkTimer handles the math and the countdowns so you can focus on your athletes. • Instantly calculates warm‑up times by level • Visual and audio cues keep everyone on track • Ensures fairness across all rotations • Works on any device—no setup headaches • Lets you coach without watching the clock --- For Meet Directors: Professional Timing Without Extra Staff Running a meet is complex—timing shouldn’t be. ChalkTimer eliminates the need for volunteer timers and manual calculations, giving you a polished, automated solution. • Supports over 144 USAG‑compliant timing combinations • Custom time override for unique formats • Keeps sessions on schedule and transitions smooth • Works offline—no WiFi, no problem (PRO version required) • Projects cleanly to displays or judge panels • Makes your meet look and run like a championship --- Key Features That Set ChalkTimer Apart • Dynamic time calculation by level and athlete count • Audio and visual alerts for seamless transitions • One‑tap reset between rotations • Flexible display modes for any setup • Offline reliability—built for real‑world gym conditions (PRO version required) • Intuitive interface for fast, frustration‑free use --- Built by Gymnastics Pros, for the Gymnastics World ChalkTimer was born from the chaos of real meets. Created by experienced coaches and meet directors, it’s engineered to solve the exact problems you face on competition day. From small invitationals to large‑scale events, ChalkTimer brings order, accuracy, and peace of mind. --- Why ChalkTimer Wins • Trusted USAG rule compliance • Saves time, staff, and sanity • Elevates your meet’s professionalism • Keeps athletes, coaches, and judges in sync • Designed with the gymnastics community in mind --- Run your meet like clockwork—download ChalkTimer today. Visit https://chalktimegymnastics.com for more details.

Screenshots

one sec | screen time + focus4 screens
ChalkTimerPRO4 screens

Verdict

The call

The clearest difference is price: one sec | screen time + focus at Free against ChalkTimerPRO's $5.99. one sec | screen time + focus also leads on ratings volume (24K vs 4) and device support (4 vs 2). ChalkTimerPRO's advantage is in-app purchases (none vs 6) and review sentiment (100% vs 76%). On update cadence 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

one sec | screen time + focus is free to download; ChalkTimerPRO costs $5.99 up front. one sec | screen time + focus sells 6 in-app purchases, starting at $2.99 per month. ChalkTimerPRO asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

ChalkTimerPRO holds the better App Store score, 5.0 against 4.8. 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 point the same way: 76% of one sec | screen time + focus's written reviews are positive against 100% of ChalkTimerPRO's.

UpkeepUpdate frequency

one sec | screen time + focus ships an update every 2 weeks, ChalkTimerPRO every 10 days. The most recent releases landed on September 28, 2026 and September 16, 2026 respectively.

Scorecard8 real differences · 2 level
one sec | screen time + focus versus ChalkTimerPRO: the parameters behind the verdict, then further details
Parameterone sec | screen time + focusChalkTimerPRO
PriceFree — better$5.99
Rating4.8 (24K ratings)5.0 (4 ratings) — better
Positive reviews75.9% of reviews100.0% of reviews — better
Number of ratings24K — better4
Update frequencyEvery 2 weeksEvery 10 days — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFreemium — betterPaid
DevicesiPhone, iPad, iPod, Mac — betteriPhone, iPad
Requires iOS15.0 — better18.6
Further details — not scored
Size368 MB19 MB
Age rating4+4+
Developerriedel.wtf apps S.L.Kristo Designs LLC (US)

Customer experience

one sec | screen time + focus

All ratings23,574 ratings
Positive96.0%
Neutral1.5%
Negative2.5%
Written reviews1,610 reviews
Positive75.9%
Neutral9.4%
Negative14.7%

ChalkTimerPRO

All ratings4 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews4 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

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)

ChalkTimerPRO

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)$2.991 Month
  • one sec pro | Family Plan (1 Month)7 Days trial$4.991 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

ChalkTimerPRO

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 ChalkTimerPRO free?
ChalkTimerPRO costs $5.99, with no in-app purchases.
Which has better reviews, one sec | screen time + focus or ChalkTimerPRO?
ChalkTimerPRO is rated higher. one sec | screen time + focus averages 4.8 out of 5 from 24K ratings, while ChalkTimerPRO averages 5.0 from 4 ratings.
Do one sec | screen time + focus or ChalkTimerPRO have ads?
Neither one sec | screen time + focus nor ChalkTimerPRO shows ads.
Which is updated more often, one sec | screen time + focus or ChalkTimerPRO?
one sec | screen time + focus ships an update every 2 weeks, and ChalkTimerPRO every 10 days. Most recently, one sec | screen time + focus was updated on September 28, 2026 and ChalkTimerPRO on September 16, 2026.

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