# My Flood Risk vs ∫dx

The clearest difference is update cadence: ∫dx at monthly against My Flood Risk's every 14 months. My Flood Risk's advantage is iOS requirement (9.0 vs 15.1). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. My Flood Risk sells 2 one-off in-app purchases and ∫dx sells 2 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

My Flood Risk ships an update every 14 months, ∫dx monthly. The most recent releases landed on November 2, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | My Flood Risk | ∫dx |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 14 months | **Monthly** |
| Size | 38 MB | 42 MB |
| Requires iOS | **9.0** | 15.1 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [HKV lijn in water](https://appshunter.io/developer/955836075) | [PRANEEL AGRAWAL](https://appshunter.io/developer/1868893039) |

## What reviewers say

### My Flood Risk

[App page](https://appshunter.io/ios/app/my-flood-risk/id1261855282)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| EU River T1000 Y2000 | Free | one-time |
| EU River T100 Y2000 | Free | one-time |


### ∫dx

[App page](https://appshunter.io/ios/app/dx-a-level-maths-practice/id6758026965)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| dx Premium Monthly | $4.99 | per month |
| dx Premium Annual | $12.99 | per year |


## Frequently asked questions

### Is My Flood Risk free?

My Flood Risk is free to download, with in-app purchases available.

### Is ∫dx free?

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

### Do My Flood Risk or ∫dx have ads?

Neither My Flood Risk nor ∫dx shows ads.

### Which is updated more often, My Flood Risk or ∫dx?

My Flood Risk ships an update every 14 months, and ∫dx monthly. Most recently, My Flood Risk was updated on November 2, 2026 and ∫dx on October 31, 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.*