# Interactive Number Line vs Monsty

The clearest difference is update cadence: Monsty at every 6 weeks against Interactive Number Line's every 35 months. Interactive Number Line's advantage is price ($0.99 vs $2.99) and iOS requirement (12.0 vs 15.1). On ads, in-app purchases and device support there is nothing between them.

Interactive Number Line costs $0.99 and Monsty $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Interactive Number Line ships an update every 35 months, Monsty every 6 weeks. The most recent releases landed on September 8, 2026 and August 21, 2026 respectively.

## The numbers

| Metric | Interactive Number Line | Monsty |
| --- | --- | --- |
| Price | **$0.99** | $2.99 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 35 months | **Every 6 weeks** |
| Size | 20 MB | 29 MB |
| Requires iOS | **12.0** | 15.1 |
| Devices | iPad, Apple TV | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Ventura Educational Systems](https://appshunter.io/developer/371324172) | [PATRICIA SAUER](https://appshunter.io/developer/1697710298) |

## What reviewers say

### Interactive Number Line

[App page](https://appshunter.io/ios/app/interactive-number-line/id1146532589)

**Features:** macOS Compatibility

**In-app purchases:** none


### Monsty

[App page](https://appshunter.io/ios/app/monsty-first-math/id6738328693)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Interactive Number Line free?

Interactive Number Line costs $0.99, with no in-app purchases.

### Is Monsty free?

Monsty costs $2.99, with no in-app purchases.

### Do Interactive Number Line or Monsty have ads?

Neither Interactive Number Line nor Monsty shows ads.

### Which is updated more often, Interactive Number Line or Monsty?

Interactive Number Line ships an update every 35 months, and Monsty every 6 weeks. Most recently, Interactive Number Line was updated on September 8, 2026 and Monsty on August 21, 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.*