# Retaining walls vs PocketFlow

The clearest difference is price: PocketFlow at Free against Retaining walls's $0.99. PocketFlow also leads on update cadence (weekly vs fortnightly). Retaining walls's advantage is in-app purchases (none vs 2) and iOS requirement (16.4 vs 18.0). On ads and device support there is nothing between them.

PocketFlow is free to download; Retaining walls costs $0.99 up front. PocketFlow sells 2 one-off in-app purchases. Retaining walls asks for nothing beyond the download.

Retaining walls ships an update fortnightly, PocketFlow weekly. The most recent releases landed on November 3, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Retaining walls | PocketFlow |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | **[1.0 (1 ratings)](https://appshunter.io/ios/app/retaining-walls/id6469571321/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | **Weekly** |
| Monetization | Paid | — |
| Size | 4 MB | 79 MB |
| Requires iOS | **16.4** | 18.0 |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Fourth Element Energy Pty Ltd](https://appshunter.io/developer/1652667540) | [Aqua Axolotl Analytics](https://appshunter.io/developer/1828911252) |

## What reviewers say

### Retaining walls

[App page](https://appshunter.io/ios/app/retaining-walls/id6469571321)

This app helps engineers design and assess flexible retaining walls. It simplifies complex calculations for stable and cost-efficient wall designs with an intuitive interface and advanced features.

**Highlights:** Design flexible retaining walls, Assess wall stability, Simplify complex calculations, Cost-efficiency optimization, User-friendly interface

**Features:** macOS Compatibility

**In-app purchases:** none


### PocketFlow

[App page](https://appshunter.io/ios/app/pocketflow-water-simulator/id6749147689)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 7-Day Trial | Free | one-time |
| Unlock PocketFlow | $9.99 | one-time |


## Frequently asked questions

### Is Retaining walls free?

Retaining walls costs $0.99, with no in-app purchases.

### Is PocketFlow free?

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

### Do Retaining walls or PocketFlow have ads?

Neither Retaining walls nor PocketFlow shows ads.

### Which is updated more often, Retaining walls or PocketFlow?

Retaining walls ships an update fortnightly, and PocketFlow weekly. Most recently, Retaining walls was updated on November 3, 2026 and PocketFlow on October 28, 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.*