44+ iOS apps & games curated and reviewed
The best riemann apps and games on iPhone average 3.9★ across 44+ titles — we've ranked them by what real users actually keep on their phones. Updated October 2026.
| # | App | Price | Rating | Ads | In-App Purchases | Updated | |
|---|---|---|---|---|---|---|---|
| 1 |  | Free | 5.0★ (2) | No | No | Oct 2026 | |
| 2 |  | Free | — | No | No | Sep 2026 | |
| 3 |  | Free | 5.0★ (1) | No | No | May 2026 | |
| 4 |  | $2.99 | — | No | No | Oct 2026 | |
| 5 |  | Free | — | No | Yes | Nov 2026 | |
| 6 |  | Free | 4.1★ (7) | No | No | Oct 2026 | |
| 7 |  | Free | — | No | No | Oct 2026 | |
| 8 |  | Free | 1.0★ (1) | Yes | No | Jun 2026 |
This app approximates integrals using Riemann summation techniques. Input your function and range, then choose from four methods: Left, Right, Middle, or Trapezoid. It supports common functions and constants.
Explore seven unsolved mathematical mysteries, each with a million-dollar prize. This app adapts content for all skill levels, from middle schoolers to doctoral researchers, with interactive 3D visualizations and built-in quizzes. Learn at your own pace, offline, with no ads or subscriptions.
