# K vs Number Rack, by MLC

The clearest difference is rating: K at 5.0 against Number Rack, by MLC's 3.2. K also leads on update cadence (every 4 months vs every 25 months) and iOS requirement (10.0 vs 14.7). Number Rack, by MLC's advantage is ratings volume (9 vs 2). On price, ads, in-app purchases and monetization model there is nothing between them.

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

K holds the better App Store score, 5.0 against 3.2. Both are backed by a comparable volume of ratings — 2 and 9 respectively.

K ships an update every 4 months, Number Rack, by MLC every 25 months. Both last shipped on October 24, 2026.

## The numbers

| Metric | K | Number Rack, by MLC |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/k-2-math-tools/id1000444174/reviews)** | [3.2 (9 ratings)](https://appshunter.io/ios/app/number-rack-by-mlc/id1469094747/reviews) |
| Number of ratings | 2 | **9** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 25 months |
| Monetization | Free | Free |
| Size | 35 MB | 4 MB |
| Requires iOS | **10.0** | 14.7 |
| Devices | iPad | iPad |
| Age rating | 4+ | 4+ |
| Developer | [Classroom Focused Software](https://appshunter.io/developer/406741679) | [The Math Learning Center](https://appshunter.io/developer/1542700905) |

## What reviewers say

### K

[App page](https://appshunter.io/ios/app/k-2-math-tools/id1000444174)

This app provides a collection of interactive math tools for kindergarten through second-grade classrooms. It includes manipulatives like base 10 blocks, counters, and number lines, along with grids and a basic calculator to aid in problem-solving.

**Highlights:** Marker board, Base 10 blocks (1s & 10s), Counters, 10 frames, Number line, Addition grids, 100s chart, Basic calculator

**Features:** macOS Compatibility

**In-app purchases:** none


### Number Rack, by MLC

[App page](https://appshunter.io/ios/app/number-rack-by-mlc/id1469094747)

This virtual manipulative tool helps children develop number sense through interactive bead groupings. It supports exploration of addition and subtraction strategies with customizable rows and colors. Ideal for elementary classrooms, it includes annotation and sharing features.

**Highlights:** 1-10 rows of 10 beads, Resizable bead covers for subtraction, Color-coded bead rows, Annotation and drawing tools, Math text and writing tools, Shareable work via image or code

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is K free?

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

### Is Number Rack, by MLC free?

Number Rack, by MLC is free to download, with no in-app purchases.

### Which has better reviews, K or Number Rack, by MLC?

K is rated higher. K averages 5.0 out of 5 from 2 ratings, while Number Rack, by MLC averages 3.2 from 9 ratings.

### Do K or Number Rack, by MLC have ads?

Neither K nor Number Rack, by MLC shows ads.

### Which is updated more often, K or Number Rack, by MLC?

K ships an update every 4 months, and Number Rack, by MLC every 25 months. Most recently, K was updated on October 24, 2026 and Number Rack, by MLC on October 24, 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.*