# Slope Calculator Plus vs Noomba

The clearest difference is price: Noomba at Free against Slope Calculator Plus's $2.99. Slope Calculator Plus's advantage is in-app purchases (none vs 1). On update cadence, ads, device support and iOS requirement there is nothing between them.

Noomba is free to download; Slope Calculator Plus costs $2.99 up front. Noomba sells 1 one-off in-app purchase. Slope Calculator Plus asks for nothing beyond the download.

Slope Calculator Plus ships an update every 23 months, Noomba every 40 months. The most recent releases landed on November 7, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Slope Calculator Plus | Noomba |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 23 months** | Every 40 months |
| Size | 1 MB | 18 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 9+ | 4+ |
| Developer | [Heng Jia Liang](https://appshunter.io/developer/1532000635) | [Martin Hoeller](https://appshunter.io/developer/867637412) |

## What reviewers say

### Slope Calculator Plus

[App page](https://appshunter.io/ios/app/slope-calculator-plus/id1627653061)

**Features:** macOS Compatibility

**In-app purchases:** none


### Noomba

[App page](https://appshunter.io/ios/app/noomba-foreign-numbers/id6448237241)

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium | $2.99 | one-time |


## Frequently asked questions

### Is Slope Calculator Plus free?

Slope Calculator Plus costs $2.99, with no in-app purchases.

### Is Noomba free?

Noomba is free to download, with in-app purchases available.

### Do Slope Calculator Plus or Noomba have ads?

Neither Slope Calculator Plus nor Noomba shows ads.

### Which is updated more often, Slope Calculator Plus or Noomba?

Slope Calculator Plus ships an update every 23 months, and Noomba every 40 months. Most recently, Slope Calculator Plus was updated on November 7, 2026 and Noomba on October 30, 2026.

---

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