250+ iOS apps curated and reviewed
Out of 250+ variable definition apps on iOS, 17 are free and the rest sit in the paid tier. This page sorts them so you can compare both sides before you commit.
| # | App | Price | Rating | Ads | In-App Purchases | Updated | |
|---|---|---|---|---|---|---|---|
| 1 |  | Free | 4.7★ (23) | No | Yes | Sep 2026 | |
| 2 |  | Free | 4.3★ (1.3K) | No | No | Sep 2026 | |
| 3 |  | Free | 4.6★ (726) | No | No | Sep 2026 | |
| 4 |  | $12.99 | 3.8★ (1.6K) | No | No | Aug 2026 | |
| 5 |  | Free | — | Yes | Yes | May 2026 | |
| 6 |  | Free | 1.0★ (3) | Yes | Yes | Sep 2026 | |
| 7 |  | Free | 4.0★ (1) | No | No | May 2026 | |
| 8 |  | Free | 2.1★ (7) | No | No | Aug 2026 |
This AI-powered assistant helps users prepare for job interviews by generating professional responses to questions and conducting mock interviews tailored to their resume and job requirements. It offers fast, structured answers and regularly updates its question bank to reflect current hiring trends.
Explore mathematical concepts by graphing any equation, from simple lines to complex series. This powerful tool allows for interactive exploration with sliders, data tables, and animations. It also includes a scientific calculator and supports inequalities and accessibility features.
Enhance your mathematical understanding with a comprehensive reference covering 23 subjects, over 200 articles, and interactive illustrations. Explore detailed explanations, solved problems, and proofs to master concepts from algebra to calculus. Access all content and features with a premium upgrade.
