Comparison

20 Seconds vs Just One Thing

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

Head to head
About

20 Seconds

This app helps build new habits or break existing ones by using a 20-second countdown. It provides a progress indicator and optional sounds or music to aid in distraction and amusement during the countdown.

Highlights
  • 20-second habit timer
  • Progress indicator
  • Distracting sounds and music
  • Automatic start option
  • 30-day trial in Today widget
Read full description

20 Seconds is a simple app, whose only purpose is to count, you guessed it, to 20 seconds. Why, one might ask, 20 seconds? Well, there is a theory that says that 20 seconds is enough time to help you build a new habit, or help you break an existing one. To start with good habits, if you want to do something, you are much more likely to actually do it, if you start within 20 seconds from when you first thought about it. If you wait any longer, you are less likely to go through with it. Conversely, if you want to break a bad habit, waiting 20 seconds after you get the urge, will make it easier for you to avoid doing it. So, when you feel an urge to do something you want to stop doing, start the 20 Seconds app and let it count down. See how you feel about that urge after 20 seconds have passed. While counting down, the app will show a progress indicator, (with or without a random shape), play music or play ticking sounds to distract and amuse you a little bit. It can start counting automatically as soon as you start the app. It also has a 30 day trail of usage in the today widget.

About

Just One Thing

This app helps you simplify your day by focusing on a single meaningful task. It encourages small daily achievements to build momentum and consistency, preventing overwhelm from long to-do lists. Celebrate progress, not perfection, and build better habits one task at a time.

Highlights
  • Focus on one task at a time
  • Avoid overwhelm
  • Build daily streaks
  • Preset and custom tasks
  • Celebrate progress
Features
Read full description

Just One Thing - Do Less, Move Forward Just One Thing helps you simplify your day by focusing on one meaningful task at a time. If you’ve ever felt overwhelmed by long to-do lists or unsure where to start, this app is for you. Just One Thing encourages small daily wins that help you build momentum, stay consistent, and feel in control. Why it works: - Avoid overwhelm by limiting how much you take on each day - Stay consistent without pressure - Build a streak that motivates you - Focus on what matters, not just doing more How it works: 1. Start with just one task - no matter how small. 2. Complete it to build your streak and unlock more task slots. 3. Choose from helpful preset tasks or create your own. 4. Celebrate progress - not perfection. Whether it’s opening a window, stretching, or messaging a friend, Just One Thing helps you show up and feel good doing it. Build better habits. One task at a time. Download Just One Thing and feel the power of doing less - with more intention.

Screenshots

20 Seconds4 screens
Just One Thing4 screens

Verdict

The call

The clearest difference is rating: Just One Thing at 5.0 against 20 Seconds's 4.5. Just One Thing also leads on in-app purchases (none vs 2). 20 Seconds's advantage is ratings volume (19 vs 1) and update cadence (every 3 months vs every 7 months). On price, 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. 20 Seconds sells 2 one-off in-app purchases. Just One Thing asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Just One Thing holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: 20 Seconds has 19 ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

20 Seconds ships an update every 3 months, Just One Thing every 7 months. The most recent releases landed on October 11, 2026 and October 18, 2026 respectively.

Scorecard6 real differences · 4 level
20 Seconds versus Just One Thing: the parameters behind the verdict, then further details
Parameter20 SecondsJust One Thing
PriceFreeFree
Rating4.5 (19 ratings)5.0 (1 ratings) — better
Positive reviews66.7% of reviews—
Number of ratings19 — better1
Update frequencyEvery 3 months — betterEvery 7 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS12.0 — better26.0
Further details — not scored
Size41 MB9 MB
Age rating4+4+
DeveloperNishco LtdTyler Ferrington

Customer experience

20 Seconds

All ratings19 ratings
Positive89.5%
Neutral0.0%
Negative10.5%
Written reviews3 reviews
Positive66.7%
Neutral33.3%
Negative0.0%

Just One Thing

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

2 purchases

20 Seconds

One-time2
  • Premium Version$0.99
  • A Kind Tip$0.99
None

Just One Thing

No in-app purchases

Questions

Is 20 Seconds free?
20 Seconds is free to download, with in-app purchases available.
Is Just One Thing free?
Just One Thing is free to download, with no in-app purchases.
Which has better reviews, 20 Seconds or Just One Thing?
Just One Thing is rated higher. 20 Seconds averages 4.5 out of 5 from 19 ratings, while Just One Thing averages 5.0 from 1 ratings.
Do 20 Seconds or Just One Thing have ads?
Neither 20 Seconds nor Just One Thing shows ads.
Which is updated more often, 20 Seconds or Just One Thing?
20 Seconds ships an update every 3 months, and Just One Thing every 7 months. Most recently, 20 Seconds was updated on October 11, 2026 and Just One Thing on October 18, 2026.

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