# Resistor Plus vs Periodic

The clearest difference is update cadence: Periodic at every 5 weeks against Resistor Plus's every 20 months. Periodic also leads on price ($1.99 vs $2.99). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

Resistor Plus costs $2.99 and Periodic $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Resistor Plus ships an update every 20 months, Periodic every 5 weeks. The most recent releases landed on October 2, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | Resistor Plus | Periodic |
| --- | --- | --- |
| Price | $2.99 | **$1.99** |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 20 months | **Every 5 weeks** |
| Monetization | Paid | — |
| Size | 1 MB | 31 MB |
| Requires iOS | 16.6 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Nitrio](https://appshunter.io/developer/321121189) | [Om Prakash Chapagain](https://appshunter.io/developer/1618620262) |

## What reviewers say

### Resistor Plus

[App page](https://appshunter.io/ios/app/resistor-plus/id500615686)

Easily calculate resistor values and tolerance using color codes. Simply select the colors for each band, and the app instantly displays the resistance in ohms. Save your results with screenshots for future reference.

**Highlights:** Resistor color code calculation, Tolerance calculation, Instant results display, Copy result functionality, Screenshot capability, Works on iPhone and iPad, Ad-free and private

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

**In-app purchases:** none


### Periodic

[App page](https://appshunter.io/ios/app/periodic-table-elements-pro/id1628646759)

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

**In-app purchases:** none


## Frequently asked questions

### Is Resistor Plus free?

Resistor Plus costs $2.99, with no in-app purchases.

### Is Periodic free?

Periodic costs $1.99, with no in-app purchases.

### Do Resistor Plus or Periodic have ads?

Neither Resistor Plus nor Periodic shows ads.

### Which is updated more often, Resistor Plus or Periodic?

Resistor Plus ships an update every 20 months, and Periodic every 5 weeks. Most recently, Resistor Plus was updated on October 2, 2026 and Periodic on October 11, 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.*