Math Gremlin vs Subtractor
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Math Gremlin
This game makes learning basic math fun by having players guide a character through challenges to find numbers that add up to a target sum before time expires. Levels increase in difficulty, offering replayability with unique problems each time. In-game currency can be earned or purchased to enhance gameplay.
- Number addition puzzles
- Time-based challenges
- Progressive difficulty levels
- Replayable unique problems
- In-game currency for boosts
- Character customization
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Looking for a fun way to learn basic math? Your Math Gremlin will have to avoid rocks, ghosts and more as it tries to find the numbers that add up to the correct amount before time runs out. As you advance, each level adds more challenges. Not ready for the challenges of the next level? Play previous levels to hone your skills until you are ready. Each level will have a similar, yet different, math problem to solve each time you play that level. It is free to play without any ads. You can use game coins earned by completing levels to extend game time, get extra lives or get gear for your Gremlin! Want game coins faster? They are also available to purchase or for free by watching ads. Play now for free!
Subtractor
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Subtractor is a native iOS app coded in Swift, designed as a personal project to help students master subtractions effortlessly. With interactive exercises, customizable practice sessions, and progress tracking, Subtractor creates an engaging learning experience tailored to individual needs. Its sleek, distraction-free interface and responsive design make it a perfect tool for students, parents, and educators seeking to build strong foundational math skills.
Screenshots
Verdict
The clearest difference is in-app purchases: Subtractor at none against Math Gremlin's 3. Subtractor also leads on ads (none vs shown) and update cadence (every 8 days vs every 2 months). On price, device support and iOS requirement 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. Math Gremlin sells 3 one-off in-app purchases. Subtractor asks for nothing beyond the download.
Math Gremlin ships an update every 2 months, Subtractor every 8 days. Both last shipped on October 14, 2026.
| Parameter | Math Gremlin | Subtractor |
|---|---|---|
| Price | Free | Free |
| Rating | 3.8 (4 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 4 — better | — |
| Update frequency | Every 2 months | Every 8 days — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.6 | 15.6 |
| Further details — not scored | ||
| Size | 90 MB | 0 MB |
| Age rating | 4+ | 4+ |
| Developer | Blue Water Apps, LLC | David Kelen |
In-app purchases
Math Gremlin
- 25,000 Coins$0.99
- 100,000 Coins$2.99
- 500,000 Coins$9.99
Subtractor
No in-app purchases
Questions
Is Math Gremlin free?
Is Subtractor free?
Do Math Gremlin or Subtractor have ads?
Which is updated more often, Math Gremlin or Subtractor?
Other comparisons
