# Spiral Letter vs Two Links Double Pendulum

The clearest difference is ads: Two Links Double Pendulum at none against Spiral Letter's shown. Spiral Letter's advantage is iOS requirement (10.3 vs 18.2). On price, update cadence, 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.

Spiral Letter ships an update every 54 months, Two Links Double Pendulum every 47 months. The most recent releases landed on October 16, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Spiral Letter | Two Links Double Pendulum |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (1 ratings)](https://appshunter.io/ios/app/spiral-letter/id973369797/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 54 months | **Every 47 months** |
| Monetization | Ad-supported | — |
| Size | 50 MB | 281 MB |
| Requires iOS | **10.3** | 18.2 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [EIICHI KOMINE](https://appshunter.io/developer/495643581) | [Eliott Radcliffe](https://appshunter.io/developer/1477487767) |

## What reviewers say

### Spiral Letter

[App page](https://appshunter.io/ios/app/spiral-letter/id973369797)

Create visually striking messages by arranging text in a spiral. Customize sentence orientation, rotation direction, and even individual character colors for maximum impact. Express your thoughts with unique flair.

**Highlights:** Spiral text arrangement, Customizable sentence orientation, Adjustable rotation direction, Individual character font color setting, Add impact to messages

**Features:** Vision Pro support

**In-app purchases:** none


### Two Links Double Pendulum

[App page](https://appshunter.io/ios/app/two-links-double-pendulum/id1625794656)

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

**In-app purchases:** none


## Frequently asked questions

### Is Spiral Letter free?

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

### Is Two Links Double Pendulum free?

Two Links Double Pendulum is free to download, with no in-app purchases.

### Do Spiral Letter or Two Links Double Pendulum have ads?

Spiral Letter shows ads; Two Links Double Pendulum does not.

### Which is updated more often, Spiral Letter or Two Links Double Pendulum?

Spiral Letter ships an update every 54 months, and Two Links Double Pendulum every 47 months. Most recently, Spiral Letter was updated on October 16, 2026 and Two Links Double Pendulum on October 25, 2026.

---

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