MohrSolver vs Four Numbers
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
MohrSolver
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Explore plane stress with Mohr's circle. Enter the normal stresses in the x and y directions and the in-plane shear stress using the familiar stress-element diagram. • Calculate principal stresses, principal directions and maximum in-plane shear stress • View Mohr's circle and the calculation results • Inspect stresses on a rotated plane • Save calculations and share results • Load an example and consult the built-in reference • Select a stress-unit label for MPa, kPa, Pa, psi or ksi Use the same unit for all three inputs. Changing the unit label does not convert values already entered. Small contextual banner ads may appear outside the calculator controls. Remove banner ads with an optional one-time Remove Ads purchase. Restore Purchases is available in Support. No subscription or app account is required.
Four Numbers
Strengthen your brain with a minimalist puzzle game focused on numbers. Enjoy bite-sized gameplay without timers or pressure, improving your cognitive skills and number literacy. Compete with others on GameCentre scoreboards among thousands of puzzles.
- Minimalist puzzle design
- No timers or pressure
- Improves number literacy
- Builds cognitive skills
- GameCentre scoreboards
- 9999 puzzles available
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Relax and strengthen your brain with Four Little Numbers. Improve your number literacy while enjoying this minimalist puzzle game. Relax and entertain yourself with bitesize gameplay, while building cognitive skills that will help you in life outside of the game. 1 - No timers, no pressure. Complete each puzzle at your own pace. 2 - Improve your mathematics skills and your ability to work with numbers. 3 - GameCentre scoreboards, how well do you know your numbers? 4 - 9999 puzzles to solve! What score will you get? This game is free. There are no ads or in app purchases. Reviews & sharing with your friends, children, or math teachers is very much appreciated. Thanks for playing!
Screenshots
Verdict
The clearest difference is ads: Four Numbers at none against MohrSolver's shown. Four Numbers also leads on update cadence (every 5 days vs every 58 months) and iOS requirement (11.0 vs 17.0). On price, 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. Neither carries in-app purchases, so what you see is what you pay.
MohrSolver ships an update every 58 months, Four Numbers every 5 days. Both last shipped on October 24, 2026.
| Parameter | MohrSolver | Four Numbers |
|---|---|---|
| Price | Free | Free |
| Rating | — | 2.0 (1 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 1 — better |
| Update frequency | Every 58 months | Every 5 days — better |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Monetization | — | Free |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 17.0 | 11.0 — better |
| Further details — not scored | ||
| Size | 4 MB | 39 MB |
| Age rating | 4+ | 4+ |
| Developer | Wahlu Labs Pty Ltd | Dean Longmore |
In-app purchases
MohrSolver
No in-app purchases
Four Numbers
No in-app purchases
Questions
Is MohrSolver free?
Is Four Numbers free?
Do MohrSolver or Four Numbers have ads?
Which is updated more often, MohrSolver or Four Numbers?
Other comparisons
