247+ iOS apps curated and reviewed
The best engineering cookbook apps on iPhone average 2.9★ across 247+ 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 | 4.5★ (6) | No | No | Oct 2026 | |
| 2 |  | Free | — | No | No | Oct 2026 | |
| 3 |  | Free | — | No | Yes | May 2026 | |
| 4 |  | Free | — | No | No | May 2026 | |
| 5 |  | Free | 4.0★ (1) | No | No | May 2026 | |
| 6 |  | Free | — | No | No | May 2026 | |
| 7 |  | Free | — | Yes | Yes | Jun 2026 | |
| 8 |  | Free | — | No | No | Sep 2026 |
A handy reference guide for mechanical designers, offering quick access to essential information on fan basics, system and duct design, motors, heating, refrigeration, and conversion factors.
