Math Keeper+ vs Mole OTG
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Math Keeper+
This app serves as a quick reference for high school math formulas, allowing users to review concepts or add their own notes and formulas. It includes a built-in calculator for convenience.
- Over 100 math formulas
- Edit existing formulas
- Add custom formulas
- Write notes
- Built-in calculator
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Math Keeper is a handy reference app for anyone who would like a refreshment of their memory about high school math, or perhaps anyone who would like a refreshment of their memory about what they were supposed to have learned in class yesterday. If you identify with either, you have come to the right place. The app includes over 100 math formulas for a quick jog of the memory, and you are able to edit them, write notes, and add your own if you so desire. A calculator is also built in for convenience, just one swipe away. Good luck.
Mole OTG
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Molar mass & mole ⇄ mass conversions Solution concentration, dilution, % (planned) Stoichiometry helpers Titration support basics Gas law (ideal gas) modules (if included build) pH / buffer (if enabled) Unit conversions (mass, volume, temperature, pressure, energy, etc.)
Screenshots
Verdict
The clearest difference is ads: Math Keeper+ at none against Mole OTG's shown. Math Keeper+ also leads on iOS requirement (9.0 vs 12.0). Mole OTG's advantage is update cadence (daily vs every 3 months). On price, 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.
Math Keeper+ ships an update every 3 months, Mole OTG daily. The most recent releases landed on October 29, 2026 and October 28, 2026 respectively.
| Parameter | Math Keeper+ | Mole OTG |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (2 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 2 — better | — |
| Update frequency | Every 3 months | Daily — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 9.0 — better | 12.0 |
| Further details — not scored | ||
| Size | 9 MB | 31 MB |
| Age rating | 4+ | 4+ |
| Developer | William Wu | Japality Limited |
In-app purchases
Math Keeper+
No in-app purchases
Mole OTG
No in-app purchases
Questions
Is Math Keeper+ free?
Is Mole OTG free?
Do Math Keeper+ or Mole OTG have ads?
Which is updated more often, Math Keeper+ or Mole OTG?
Other comparisons
