11x13 vs Baselproblem
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
11x13
This app offers daily math practice to improve number familiarity and overcome math reservations. It focuses on basic arithmetic operations with visual progress tracking through charts and grids. Daily practice sessions can enhance fundamental mathematical skills.
- Daily math practice
- Basic arithmetic operations
- Progress visualization
- Personalized calculation levels
- Leaderboard integration
- Number range grids
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A short problem, nine answers, one correct — 11x13 trains mental math with no clutter and no words in the problems. THE BASIC OPERATIONS ARE FREE. NOW AND FOREVER. Addition, subtraction, multiplication and division with level bands that grow with you: from small times tables over carrying to the 11–19 tables — the app's namesake — plus chained problems like 47 + 8 + 6 at high levels. WITH “EVERYTHING” YOU PRACTICE EVERY OPERATION. One single purchase unlocks everything permanently — try it free for 14 days: • Percentages: from 50% of round numbers to surcharge and discount • Roots: squares and cube roots • Powers: up to powers of two and ten • Derivatives and integrals: from monomials to binomials • Geometry: symbol equations (▲ + ▲ = 12), counting corners, matching shapes Your progress grows per operation, syncs via iCloud, with progress charts and a Game Center leaderboard. Now with a true iPad layout and hardware keyboard support (keys 1–9).
Baselproblem
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The Basel problem is a problem in mathematical analysis with relevance to number theory, first posed by Pietro Mengoli in 1650 and solved by Leonhard Euler in 1734.
Screenshots
Verdict
The clearest difference is update cadence: Baselproblem at every 11 months against 11x13's every 48 months. 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. Neither carries in-app purchases, so what you see is what you pay.
11x13 ships an update every 48 months, Baselproblem every 11 months. Both last shipped on September 10, 2026.
| Parameter | 11x13 | Baselproblem |
|---|---|---|
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| Update frequency | Every 48 months | Every 11 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.6 | 15.0 — better |
| Further details — not scored | ||
| Size | 2 MB | 0 MB |
| Age rating | 4+ | 4+ |
| Developer | Matthias Hennemeyer | Andreas Horvath |
In-app purchases
11x13
No in-app purchases
Baselproblem
No in-app purchases
Questions
Is 11x13 free?
Is Baselproblem free?
Do 11x13 or Baselproblem have ads?
Which is updated more often, 11x13 or Baselproblem?
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