# Resistor vs Study Sched

The clearest difference is update cadence: Study Sched at weekly against Resistor's every 9 months. Study Sched also leads on iOS requirement (15.0 vs 26.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Resistor ships an update every 9 months, Study Sched weekly. Both last shipped on September 27, 2026.

## The numbers

| Metric | Resistor | Study Sched |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (17 ratings)](https://appshunter.io/ios/app/resistor-converter/id6446839759/reviews)** | — |
| Number of ratings | **17** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 9 months | **Weekly** |
| Monetization | Free | — |
| Size | 8 MB | 1 MB |
| Requires iOS | 26.0 | **15.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Gerhard Lentschik](https://appshunter.io/developer/629988041) | [Bugsmirror Research Private Limited](https://appshunter.io/developer/1733832280) |

## What reviewers say

### Resistor

[App page](https://appshunter.io/ios/app/resistor-converter/id6446839759)

Quickly calculate resistor values from color bands or SMD codes, and vice versa. This tool is ideal for electronics enthusiasts, students, and DIYers working with 4, 5, or 6-band resistors and various SMD codes. It functions offline and requires no registration.

**Highlights:** Calculate resistor values from color bands, Convert resistor values to color bands, Supports 4, 5, and 6-band resistors, Handles SMD codes (EIA-3, EIA-4, EIA-96), Works offline, No registration required

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Study Sched

[App page](https://appshunter.io/ios/app/study-sched/id6738991531)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Resistor free?

Resistor is free to download, with no in-app purchases.

### Is Study Sched free?

Study Sched is free to download, with no in-app purchases.

### Do Resistor or Study Sched have ads?

Neither Resistor nor Study Sched shows ads.

### Which is updated more often, Resistor or Study Sched?

Resistor ships an update every 9 months, and Study Sched weekly. Most recently, Resistor was updated on September 27, 2026 and Study Sched on September 27, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*