ScratchQ vs Diffeq Solver
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ScratchQ
This app serves as a digital scratchpad for everyday calculations, allowing users to save annotated versions for future reference. It features a color-coded system for organizing calculations and a custom keyboard for easy editing and access to operators.
- Save annotated calculations
- Color-coded file system
- Custom keyboard for editing
- Easy access to arithmetic operators
- Organize everyday math problems
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ScratchQ is a scratch pad for all of the "back-of-the-envelope" calculations that we do in everyday life. Whether it is calculating the commission earned on a sale, the square footage of a room, or your grade point average, ScratchQ allows you to save an annotated version of the calculation that you can refer back to again and again. A simple color-coded file system allows you to categorize your calculations. ScratchQ comes with a custom keyboard that allows for easy editing of your saved calculations and easy access to the most common arithmetic operators.
Diffeq Solver
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Need a quick solution to an ODE on the go? Diffeq Solver is your portable companion for tackling differential equations anytime, anywhere. Features: • Numerically solves first-order ODEs • Numerically solves second-order ODEs • Uses the Runge-Kutta 4th-order (RK4) method with a fixed step size • Clean, intuitive interface—no thick manuals required Disclaimer: While every effort has been made to ensure the accuracy of the results, this software is provided as-is. Use at your own risk. By using Diffeq Solver, you agree not to hold the developer responsible for any errors or inaccuracies.
Screenshots
Verdict
The clearest difference is price: Diffeq Solver at Free against ScratchQ's $7.99. ScratchQ's advantage is iOS requirement (15.0 vs 18.0). On 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
Diffeq Solver is free to download; ScratchQ costs $7.99 up front. Neither carries in-app purchases, so what you see is what you pay.
| Parameter | ScratchQ | Diffeq Solver |
|---|---|---|
| Price | $7.99 | Free — better |
| Rating | 5.0 (1 ratings) — better | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 22 months | — |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 18.0 |
| Further details — not scored | ||
| Size | 1 MB | 6 MB |
| Age rating | 4+ | 4+ |
| Developer | Autoolmaq LLC | Hideyuki Inada |
In-app purchases
ScratchQ
No in-app purchases
Diffeq Solver
No in-app purchases
