# Rechenfeld vs 1 · 1 Tool

The clearest difference is price: 1 · 1 Tool at Free against Rechenfeld's $0.99. 1 · 1 Tool also leads on update cadence (every 2 weeks vs every 5 months) and iOS requirement (12.0 vs 17.6). On ads, in-app purchases and device support there is nothing between them.

1 · 1 Tool is free to download; Rechenfeld costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Rechenfeld ships an update every 5 months, 1 · 1 Tool every 2 weeks. The most recent releases landed on October 7, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | Rechenfeld | 1 · 1 Tool |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 2 weeks** |
| Monetization | Paid | — |
| Size | 17 MB | 559 MB |
| Requires iOS | 17.6 | **12.0** |
| Devices | iPad | iPad |
| Age rating | 4+ | 4+ |
| Developer | [Christian Urff](https://appshunter.io/developer/415894463) | [Anne Rahn](https://appshunter.io/developer/1569232499) |

## What reviewers say

### Rechenfeld

[App page](https://appshunter.io/ios/app/rechenfeld/id1558366734)

This app provides a visual aid for understanding addition and subtraction within various number ranges. It's designed to help children, especially those with learning difficulties, grasp mathematical concepts through interactive manipulation of virtual objects.

**Highlights:** Visualizes addition and subtraction, Supports number ranges up to 1000, Interactive manipulation of virtual tiles, Helps develop number sense and strategies, Illustrates decimal system concepts, Displays problems on number line and arrow diagrams

**Features:** macOS Compatibility

**In-app purchases:** none


### 1 · 1 Tool

[App page](https://appshunter.io/ios/app/1-1-tool/id1569232497)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Rechenfeld free?

Rechenfeld costs $0.99, with no in-app purchases.

### Is 1 · 1 Tool free?

1 · 1 Tool is free to download, with no in-app purchases.

### Do Rechenfeld or 1 · 1 Tool have ads?

Neither Rechenfeld nor 1 · 1 Tool shows ads.

### Which is updated more often, Rechenfeld or 1 · 1 Tool?

Rechenfeld ships an update every 5 months, and 1 · 1 Tool every 2 weeks. Most recently, Rechenfeld was updated on October 7, 2026 and 1 · 1 Tool on October 15, 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.*