# Flow Rate Conversion vs The wall

The clearest difference is price: The wall at Free against Flow Rate Conversion's $2.99. The wall also leads on update cadence (every 12 months vs every 29 months). Flow Rate Conversion's advantage is iOS requirement (13 vs 17.0). On ads, in-app purchases and device support there is nothing between them.

The wall is free to download; Flow Rate Conversion costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Flow Rate Conversion ships an update every 29 months, The wall every 12 months. The most recent releases landed on October 1, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Flow Rate Conversion | The wall |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | **[3.0 (1 ratings)](https://appshunter.io/ios/app/flow-rate-conversion/id525300855/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 29 months | **Every 12 months** |
| Monetization | Paid | — |
| Size | 1 MB | 17 MB |
| Requires iOS | **13** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Nitrio](https://appshunter.io/developer/321121189) | [Tech for Palestine](https://appshunter.io/developer/1796852240) |

## What reviewers say

### Flow Rate Conversion

[App page](https://appshunter.io/ios/app/flow-rate-conversion/id525300855)

Easily convert between various units of flow rate, including volume-based, mass-based, and mole-based measurements. Essential for physics and engineering applications involving fluid dynamics and hydrometry.

**Highlights:** Volume flow rate conversion, Mass flow rate conversion, Mole-based flow rate conversion, Physics and engineering utility, Fluid dynamics calculations

**Features:** macOS Compatibility

**In-app purchases:** none


### The wall

[App page](https://appshunter.io/ios/app/the-wall-boycott-helper/id6744613506)

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

**In-app purchases:** none


## Frequently asked questions

### Is Flow Rate Conversion free?

Flow Rate Conversion costs $2.99, with no in-app purchases.

### Is The wall free?

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

### Do Flow Rate Conversion or The wall have ads?

Neither Flow Rate Conversion nor The wall shows ads.

### Which is updated more often, Flow Rate Conversion or The wall?

Flow Rate Conversion ships an update every 29 months, and The wall every 12 months. Most recently, Flow Rate Conversion was updated on October 1, 2026 and The wall on October 7, 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.*