250+ iOS apps curated and reviewed
Out of 250+ led calculator apps on iOS, 16 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 | — | No | Yes | Sep 2026 | |
| 2 |  | $2.99 | 4.8★ (8) | No | No | Sep 2026 | |
| 3 |  | $2.99 | 4.8★ (18) | No | No | Aug 2026 | |
| 4 |  | Free | 5.0★ (2) | No | No | May 2026 | |
| 5 |  | Free | — | No | No | May 2026 | |
| 6 |  | Free | 4.0★ (1) | No | No | May 2026 | |
| 7 |  | $0.99 | 4.3★ (6) | No | No | Aug 2026 | |
| 8 |  | Free | 5.0★ (2) | No | No | May 2026 |
Calculate the correct series resistor needed to safely power light-emitting diodes. Input supply voltage, LED voltage drop, current, and the number of LEDs to find the required resistor value and wattage.
This app calculates LED screen specifications including pixel count, dimensions, and power draw. It can generate pixel grids for content mapping and export them as image files or Photoshop scripts. Users can request new LED makes and models to be added to the database.
