Comparison

One Big Thing vs ADHD Focus

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

Head to head
About

One Big Thing

Features
Read full description

A Todo app with ONE big difference. Set an intention for your day with one big thing. Review your previous Big Things. Receive notifications to remind you to check in on your big thing, and mark it as complete if you've done it.

About

ADHD Focus

Features
Read full description

Most to-do apps solve the wrong problem. They help you collect more tasks, not finish them. ThatOneThing does one thing differently: every day, you pick a single task that matters, and you finish it before you're allowed to add another. That's the whole idea. No backlog staring back at you. No twelve half-finished projects competing for your attention. Just today's one thing, front and center, until it's done. It works especially well if you've got ADHD, or you just find long lists overwhelming no matter what. Built to keep you coming back Finishing your one thing builds a streak, and streaks are protected: miss a day here and there and a shield covers it, so one bad day doesn't wipe out three weeks of work. Every completion earns XP, XP adds up to levels, and leveling up reveals more of a 34-badge collection, from your first finish to a full year of showing up. See the proof Your Done list keeps a running record of everything you've actually finished, not just what you meant to do. Watch your all-time count climb. Look back at last Tuesday and see exactly what got done and when. Make it yours (Premium) Pick an accent color, choose from several app icons, and set a custom background or font for your focus card. Premium also adds multiple active tasks for the days you genuinely need more than one, your full stats history, and streak shields. Everything else you'd expect A home screen widget shows today's one thing at a glance. Reminders nudge you at the time you choose. Dark mode, VoiceOver support, and 34 languages are built in, and your data syncs across devices with iCloud. If you're tired of a list that never finishes itself, start with one thing today. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

One Big Thing3 screens
ADHD Focus4 screens

Verdict

The call

The clearest difference is in-app purchases: One Big Thing at none against ADHD Focus's 2. ADHD Focus's advantage is update cadence (every 3 days vs every 2 months) and device support (3 vs 1). On price, ads and iOS requirement there is nothing between them.

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

CostPrice ยท In-app purchases ยท Ads ยท Monetization

Both are free to download. ADHD Focus sells 2 in-app purchases, starting at $1.99 per 7 days. One Big Thing asks for nothing beyond the download.

UpkeepUpdate frequency

One Big Thing ships an update every 2 months, ADHD Focus every 3 days. The most recent releases landed on October 30, 2026 and October 25, 2026 respectively.

Scorecard3 real differences ยท 3 level
One Big Thing versus ADHD Focus: the parameters behind the verdict, then further details
ParameterOne Big ThingADHD Focus
PriceFreeFree
Update frequencyEvery 2 monthsEvery 3 days โ€” better
AdsNoNo
In-app purchasesNo โ€” betterYes
DevicesiPhoneiPhone, iPad, Mac โ€” better
Requires iOS17.617.0 โ€” better
Further details โ€” not scored
Size1 MB32 MB
Age rating4+4+
DeveloperThomas ChattingAppgineering GbR

In-app purchases

None

One Big Thing

No in-app purchases

2 purchases

ADHD Focus

Subscriptions2
  • ThatOneThing Premium (1 week)3 Days trial$1.997 Days
  • ThatOneThing Premium (1 year)$3.991 Year

Questions

Is One Big Thing free?
One Big Thing is free to download, with no in-app purchases.
Is ADHD Focus free?
ADHD Focus is free to download, with in-app purchases available.
Do One Big Thing or ADHD Focus have ads?
Neither One Big Thing nor ADHD Focus shows ads.
Which is updated more often, One Big Thing or ADHD Focus?
One Big Thing ships an update every 2 months, and ADHD Focus every 3 days. Most recently, One Big Thing was updated on October 30, 2026 and ADHD Focus on October 25, 2026.

Other comparisons