248+ iOS apps curated and reviewed
The best siso calculator apps on iPhone average 4.4★ across 248+ titles — we've ranked them by what real users actually keep on their phones. Updated September 2026.
| # | App | Price | Rating | Ads | In-App Purchases | Updated | |
|---|---|---|---|---|---|---|---|
| 1 |  | Free | 5.0★ (3) | No | No | May 2026 | |
| 2 |  | Free | 5.0★ (4) | Yes | Yes | Sep 2026 | |
| 3 |  | Free was $5.99 | 4.5★ (144) | No | Yes | Sep 2026 | |
| 4 |  | Free | 5.0★ (2) | Yes | No | May 2026 | |
| 5 |  | Free | — | Yes | Yes | Aug 2026 | |
| 6 |  | Free | — | Yes | No | Sep 2026 | |
| 7 |  | Free | 4.7★ (1.6K) | No | Yes | Sep 2026 | |
| 8 |  | Free | 4.8★ (226) | Yes | No | Sep 2026 |
This app helps engineers and students understand System Dynamics and Controls. It offers an intuitive interface to quickly analyze controller and plant interactions in both time and frequency domains.
This app offers a comprehensive suite of calculation tools, including basic, scientific, and financial calculators, alongside unit conversions and personal utilities. It simplifies everyday math, financial planning, and unit transformations for students and professionals alike.
This app offers a comprehensive suite of financial calculators, including TVM, NPV, and ROI, with detailed explanations, formulas, and examples. It provides data visualization, reports, and AI-powered insights for complex financial calculations, all while prioritizing on-device processing for privacy.
