My Flood Risk vs ∫dx
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
My Flood Risk
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MyFloodRisk informs citizens about their exposure to flood risks. It answers the question: “how high can the water rise in my neighbourhood?” The app contains three flood maps, for statistical return periods of: • 10 year (10% probability per year) • 100 year (probability 1% per year) • 1000 year (probability 0,1% per year) The water depth is presented in meters above mean street level and is to be regarded as an indication. For more information see the disclaimer. This app recognizes your current location, but you can also enter a location name in the search bar. Changing between maps can be done in the settings. MyFloodRisk has been developed by HKV services. As a company in flood risk analysis, we find it important that science based information about floods is also easily accessible for the people who live in flood prone areas. This app therefore provides flood information in a comprehensive way for all European countries.
∫dx
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∫ dx: A-Level Maths Revision Getting good at A-Level Maths takes one thing: deliberate practice. Not more notes. Not another YouTube playlist. Questions, done consistently, until the methods become second nature. dx is built for exactly that. Smart revision that adapts to you dx tracks every question you rate as "needs work" or "partially got it" and brings it back at the right time - spacing reviews so you're drilling your weak spots, not wasting time on what you already know. AI hints that teach, not spoil Stuck on a question? Get a progressive hint that nudges you in the right direction without giving away the answer. Learn to think through problems, not just copy solutions. Full worked solutions Tap to reveal a step-by-step mark-scheme solution for every question. Not generic ChatGPT answers - structured worked examples built for A-Level Maths. What's inside: • Thousands of exam-style questions across Pure, Statistics, and Mechanics • Edexcel and OCR question banks • LaTeX rendering so every equation and diagram is crisp and readable • Daily 10 - a focused session mixing new questions with spaced review • Custom Practice - drill any topic, any category, any time • Progress tracking so you always know where you stand Free to start. Premium to go further. The core app is free. Premium unlocks unlimited AI hints, full worked solutions, and unlimited custom practice sessions. A-Level Maths rewards consistency. Use dx to build the habit, close the gaps, and hit the grade you're aiming for. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | My Flood Risk | ∫dx |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 14 months | Monthly — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 9.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 38 MB | 42 MB |
| Age rating | 4+ | 4+ |
| Developer | HKV lijn in water | PRANEEL AGRAWAL |
In-app purchases
My Flood Risk
- EU River T1000 Y2000Free
- EU River T100 Y2000Free
∫dx
- dx Premium Monthly$4.991 Month
- dx Premium Annual$12.991 Year









