# Spiral Corrector vs Pendulum Lab

The clearest difference is price: Spiral Corrector at Free against Pendulum Lab's $0.99. Spiral Corrector also leads on iOS requirement (9.3 vs 15.0). Pendulum Lab's advantage is update cadence (every 5 weeks vs every 14 months). On ads, in-app purchases and device support there is nothing between them.

Spiral Corrector is free to download; Pendulum Lab costs $0.99 up front. Spiral Corrector sells 1 one-off in-app purchase and Pendulum Lab sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Spiral Corrector ships an update every 14 months, Pendulum Lab every 5 weeks. The most recent releases landed on October 24, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | Spiral Corrector | Pendulum Lab |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | **[3.6 (45 ratings)](https://appshunter.io/ios/app/spiral-corrector/id478699256/reviews)** | — |
| Number of ratings | **45** | — |
| Positive reviews | 71.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 14 months | **Every 5 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 41 MB | 4 MB |
| Requires iOS | **9.3** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Anatoly Weinstein](https://appshunter.io/developer/385589772) | [hyeonsu jeong](https://appshunter.io/developer/1628268684) |

## What reviewers say

### Spiral Corrector

[App page](https://appshunter.io/ios/app/spiral-corrector/id478699256)

Enhance handwriting accuracy and dexterity with this app. It offers a fun way to practice drawing spirals, improving fine motor skills for all ages. Experiment with various colors, thicknesses, and effects to create unique designs.

**Highlights:** Improve penmanship, Enhance hand and finger motility, Learn to draw spirals, Adjust painting speed, Combine colors and effects, Change wheels and holes

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock Export, Remove Ads | $2.99 | one-time |


### Pendulum Lab

[App page](https://appshunter.io/ios/app/pendulum-lab/id6661026555)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Triple Pendulum Unlock | $0.99 | one-time |


## Frequently asked questions

### Is Spiral Corrector free?

Spiral Corrector is free to download, with in-app purchases available.

### Is Pendulum Lab free?

Pendulum Lab costs $0.99, and also offers in-app purchases.

### Do Spiral Corrector or Pendulum Lab have ads?

Neither Spiral Corrector nor Pendulum Lab shows ads.

### Which is updated more often, Spiral Corrector or Pendulum Lab?

Spiral Corrector ships an update every 14 months, and Pendulum Lab every 5 weeks. Most recently, Spiral Corrector was updated on October 24, 2026 and Pendulum Lab on October 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.*