# Atomic Letters vs Polyrhythm

The clearest difference is review sentiment: Atomic Letters at 100% against Polyrhythm's 25%. Atomic Letters also leads on rating (5.0 vs 2.1) and in-app purchases (none vs 3). Polyrhythm's advantage is update cadence (every 5 weeks vs every 61 months) and ratings volume (9 vs 2). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Polyrhythm sells 3 in-app purchases, starting at $1.99 per 7 days. Atomic Letters asks for nothing beyond the download.

Atomic Letters holds the better App Store score, 5.0 against 2.1. Both are backed by a comparable volume of ratings — 2 and 9 respectively. Written reviews point the same way: 100% of Atomic Letters's written reviews are positive against 25% of Polyrhythm's.

Atomic Letters ships an update every 61 months, Polyrhythm every 5 weeks. The most recent releases landed on October 9, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Atomic Letters | Polyrhythm |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/atomic-letters/id925917614/reviews)** | [2.1 (9 ratings)](https://appshunter.io/ios/app/polyrhythm-relaxing-sounds/id6462398544/reviews) |
| Number of ratings | 2 | **9** |
| Positive reviews | **100.0% of reviews** | 25.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 61 months | **Every 5 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 9 MB | 131 MB |
| Requires iOS | **11.0** | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Post River Software](https://appshunter.io/developer/325439356) | [Stanislav Duplinskiy](https://appshunter.io/developer/1529735040) |

## What reviewers say

### Atomic Letters

[App page](https://appshunter.io/ios/app/atomic-letters/id925917614)

Create unique visual representations of names and phrases using elements from the Periodic Table. Personalize your creations with custom fonts, colors, and backgrounds. The app generates high-quality PNG files perfect for various design projects.

**Highlights:** Spell names and phrases with Periodic Table elements, Customize fonts, colors, and backgrounds, Generate PNG files for various uses, Unique name spellings, Personalized design options

**In-app purchases:** none


### Polyrhythm

[App page](https://appshunter.io/ios/app/polyrhythm-relaxing-sounds/id6462398544)

Create a personalized soundscape for relaxation, sleep, or meditation. Explore a variety of organic and synthesized instruments, ambient background sounds, and AI-generated presets. Customize and save your favorite sound combinations for a tranquil experience.

**Highlights:** Variety of sound presets, Organic and synthesized instruments, Background ambient sounds, AI preset generator, Advanced preset customization, Create and save custom presets

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full access to app functions | $1.99 | per 7 days |
| Full access to app functions | $5.99 | per month |
| Full access to app functions | $12.99 | per 3 months |


## Frequently asked questions

### Is Atomic Letters free?

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

### Is Polyrhythm free?

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

### Which has better reviews, Atomic Letters or Polyrhythm?

Atomic Letters is rated higher. Atomic Letters averages 5.0 out of 5 from 2 ratings, while Polyrhythm averages 2.1 from 9 ratings.

### Do Atomic Letters or Polyrhythm have ads?

Neither Atomic Letters nor Polyrhythm shows ads.

### Which is updated more often, Atomic Letters or Polyrhythm?

Atomic Letters ships an update every 61 months, and Polyrhythm every 5 weeks. Most recently, Atomic Letters was updated on October 9, 2026 and Polyrhythm on October 24, 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.*