# PenFlow vs Math Grid Calculation Training

The clearest difference is ads: PenFlow at none against Math Grid Calculation Training's shown. PenFlow also leads on update cadence (every 10 days vs every 2 months). Math Grid Calculation Training's advantage is iOS requirement (15.0 vs 17.0). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

PenFlow ships an update every 10 days, Math Grid Calculation Training every 2 months. The most recent releases landed on September 5, 2026 and September 12, 2026 respectively.

## The numbers

| Metric | PenFlow | Math Grid Calculation Training |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Every 10 days** | Every 2 months |
| Size | 5 MB | 95 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [SANWA Inc.](https://appshunter.io/developer/1878028373) | [Masaki Kanno](https://appshunter.io/developer/843112443) |

## What reviewers say

### PenFlow

[App page](https://appshunter.io/ios/app/penflow/id6761091973)

**Features:** macOS Compatibility

**In-app purchases:** none


### Math Grid Calculation Training

[App page](https://appshunter.io/ios/app/math-grid-calculation-training/id6769310340)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is PenFlow free?

PenFlow is free to download, with no in-app purchases.

### Is Math Grid Calculation Training free?

Math Grid Calculation Training is free to download, with no in-app purchases.

### Do PenFlow or Math Grid Calculation Training have ads?

Math Grid Calculation Training shows ads; PenFlow does not.

### Which is updated more often, PenFlow or Math Grid Calculation Training?

PenFlow ships an update every 10 days, and Math Grid Calculation Training every 2 months. Most recently, PenFlow was updated on September 5, 2026 and Math Grid Calculation Training on September 12, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*