# SJ Resistor Calculator vs Walvis

The clearest difference is in-app purchases: Walvis at none against SJ Resistor Calculator's 5. Walvis also leads on ads (none vs shown) and iOS requirement (13.4 vs 16.0). SJ Resistor Calculator's advantage is update cadence (every 2 weeks vs monthly). On price and device support there is nothing between them.

Both are free to download. SJ Resistor Calculator sells 5 one-off in-app purchases. Walvis asks for nothing beyond the download.

SJ Resistor Calculator ships an update every 2 weeks, Walvis monthly. The most recent releases landed on July 18, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | SJ Resistor Calculator | Walvis |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/sj-resistor-calculator/id6504838457/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 2 weeks** | Monthly |
| Monetization | Free with in-app purchases | — |
| Size | 4 MB | 14 MB |
| Requires iOS | 16.0 | **13.4** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Stephane JAILLIARD](https://appshunter.io/developer/1749751077) | [SARL RED BEARD SOFT](https://appshunter.io/developer/1479549933) |

## What reviewers say

### SJ Resistor Calculator

[App page](https://appshunter.io/ios/app/sj-resistor-calculator/id6504838457)

This tool simplifies resistor calculations for electronics enthusiasts, students, and professionals. It accurately decodes resistor color codes and performs series/parallel calculations for complex circuit analysis. Avoid manual errors and streamline your electronics projects.

**Highlights:** Resistor color code decoding (4, 5, 6 band), Series resistor calculations, Parallel resistor calculations, Accurate resistance and tolerance values, User-friendly interface

**Features:** macOS Compatibility

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| A coffee | $0.99 | one-time |
| A cookie | $2.99 | one-time |
| No ads | $4.99 | one-time |
| A lemon tart | $4.99 | one-time |
| A pizza | $9.99 | one-time |


### Walvis

[App page](https://appshunter.io/ios/app/walvis/id6605935671)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is SJ Resistor Calculator free?

SJ Resistor Calculator is free to download, with in-app purchases available.

### Is Walvis free?

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

### Do SJ Resistor Calculator or Walvis have ads?

SJ Resistor Calculator shows ads; Walvis does not.

### Which is updated more often, SJ Resistor Calculator or Walvis?

SJ Resistor Calculator ships an update every 2 weeks, and Walvis monthly. Most recently, SJ Resistor Calculator was updated on July 18, 2026 and Walvis on September 20, 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.*