Core Three vs Build
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.
Build
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Build turns focus time into something real. Pick what you want to build, choose the apps you want blocked, and start a session โ Build uses Apple's Screen Time to keep you off them until you're done. Every completed session earns you something for your world: a bench, a garden arch, a gazebo. Keep going and your island grows with you. Miss a day and your streak resets, so there's a reason to come back tomorrow. Add friends to see their islands, compare stats, and start a collaborative build together โ you both stay off your phones, you both earn the reward. What Build does: โข Block chosen apps and categories during a focus session, enforced by Apple's Screen Time โข Earn buildings and grow your own island with every completed session โข Track your streak and lifetime focus time โข Add friends, see their worlds, and start collaborative sessions together โข No ads, no third-party trackers, nothing sold โ see our Privacy Policy for specifics
Screenshots
Verdict
The clearest difference is iOS requirement: Core Three at 17.6 against Build's 26.5. On price, ads, in-app purchases and device support 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
| Parameter | Core Three | Build |
|---|---|---|
| Price | Free | Free |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone | iPhone |
| Requires iOS | 17.6 โ better | 26.5 |
| Further details โ not scored | ||
| Size | 1 MB | 63 MB |
| Age rating | 4+ | 4+ |
| Developer | PAUL SHIN GAY | brian wan |
In-app purchases
Core Three
No in-app purchases
Build
No in-app purchases









