Core Three vs Nook
Price, ratings, monetisation and update history for both apps, side by side โ with what reviewers say about each.
Core Three
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STAY FOCUSED. GET MORE DONE. Too many tasks? Overwhelmed by endless to-do lists? Core Three keeps you focused on what truly matters by limiting you to just 3 tasks per day. WHY CORE THREE? Research shows that focusing on fewer tasks leads to better completion rates and less stress. Core Three enforces this proven productivity principle with a simple rule: only 3 active tasks at a time. KEY FEATURES - 3-Task Daily Limit โ Focus on your most important tasks without distraction - Smart Backlog โ Store future tasks and let them automatically move to Today when you're ready - Due Dates & Notes โ Add context and deadlines to stay organized - Track Progress โ See your completed tasks and celebrate your wins - Powerful Search โ Find any task instantly across all lists - Clean Design โ Beautiful, intuitive interface that stays out of your way HOW IT WORKS 1) Add your tasks to the Backlog with due dates 2) Move your top 3 priorities to Today 3) Complete them before adding more 4) Review your accomplishments in Done Stop juggling endless tasks. Start finishing what matters.
Nook
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Nook is a quiet corner for focused work. Set a timer, work in short bursts, and take real breaks in between. No character to feed, no leaderboard to climb, no streak shaming you for a day off. Just the time you gave to the thing you were doing. COMPLETELY FREE No trial countdown. No subscription. No paywall. No ads. There is nothing to buy in Nook, now or ever. FOCUS TIMER Work, short break and long break lengths are all yours to set. A breathing ring marks the session so you can tell at a glance where you are without reading numbers. Pause, skip a phase, or stop whenever you need to. STOPWATCH When 25 minutes is the wrong shape, count up instead. Take laps to mark stages inside one long stretch. Stopping saves the session to your history like any other. YOUR HISTORY See any day, week or month. A chart shows when you actually focused, and every session is listed with its start and end time. Plain numbers, no scores. OPTIONAL GOALS Daily, weekly and monthly session targets, off unless you switch them on. Missing one does nothing at all. GENTLE REMINDERS Pick the days and times you want to be nudged. Nook says something short and encouraging, then leaves you alone. MADE TO STAY OUT OF THE WAY Six alarm tones to choose from, or none. Light, dark, or follow the system. A quiet accent colour if you want one. Haptics you can switch off. Breaks that start on their own, or wait for you. PRIVATE BY DESIGN No account. No sign-in. No analytics. Everything you enter stays on your device. Nook has no server to send it to. Nook is for students, for people with ADHD who need a timer that does not nag, and for anyone who just wants a calm place to put their attention for a while.
Screenshots
Verdict
Core Three and Nook are too close to call on the numbers: across 5 compared parameters โ price, ads, in-app purchases and device support among them โ neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.
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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
| Parameter | Core Three | Nook |
|---|---|---|
| Price | Free | Free |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone | iPhone |
| Requires iOS | 17.6 | 17.0 โ better |
| Further details โ not scored | ||
| Size | 1 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | PAUL SHIN GAY | TTB INTERNATIONAL LLC |
In-app purchases
Core Three
No in-app purchases
Nook
No in-app purchases









