Number Line vs Mr Kai
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Number Line
This app provides an interactive number line for educational purposes, enabling users to visualize numbers, perform various math games, and practice rounding. Its simple interface supports zooming, swiping, and marking numbers with pins or freehand drawing.
- Infinite number line visualization
- Rounding practice (nearest 10, 100, 10,000)
- Number comparison
- Pinch-to-zoom functionality
- Swipe navigation
- Search for specific numbers
- Pin marking
- Freehand drawing tool
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An infinite number line to use in the classroom, with a simple design that allows for numerous maths games and challenges! • Ask the class to round to the nearest 10/100/10,000. • Visualise the size of numbers relative to one another, including negatives. How to use: • Zoom with a pinch • Swipe along the number line • Go to a number by typing in the search box • Drag and drop pins to mark numbers • Draw free-hand with the pen tool
Mr Kai
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Mr Kai. Daily GCSE Revision That Actually Sticks Most students don’t struggle because they’re not capable, they struggle because they don’t revise consistently. Mr Kai fixes that. CORE VALUE Mr Kai gives students a short, personalised daily quiz based on what they actually need to improve, plus clear feedback on how to do better next time. Just 5 to 10 minutes a day builds real progress. FOR STUDENTS Daily quizzes tailored to your subjects and weak areas Instant feedback showing what to improve Build streaks and earn XP for consistency Practise topics to boost tomorrow’s score AI generated revision notes and quizzes FOR PARENTS See exactly when your child is studying Track progress and performance over time Optional reward system to motivate consistency No more guessing, everything is visible WHY IT WORKS Spaced repetition targets weak areas Daily habit beats last minute cramming Feedback after every quiz shows what to fix next WHAT TO EXPECT Most students use Mr Kai for 5 to 10 minutes a day and build a consistent revision habit over time. EXAM BOARD COVERAGE Works across all major GCSE boards AQA, Edexcel, OCR, WJEC Mr Kai, the GCSE revision system students actually stick to.
Screenshots
Verdict
The clearest difference is update cadence: Mr Kai at daily against Number Line's every 15 months. Number Line's advantage is iOS requirement (13.0 vs 16.6). On price, ads, in-app purchases 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Number Line ships an update every 15 months, Mr Kai daily. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.
| Parameter | Number Line | Mr Kai |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (5 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 5 — better | — |
| Update frequency | Every 15 months | Daily — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 13.0 — better | 16.6 |
| Further details — not scored | ||
| Size | 16 MB | 172 MB |
| Age rating | 4+ | 12+ |
| Developer | Blastoff Design | Henry Willis |
In-app purchases
Number Line
No in-app purchases
Mr Kai
No in-app purchases









