# firefly vs Rhythm Note

The clearest difference is price: firefly at Free against Rhythm Note's $3.99. Rhythm Note's advantage is update cadence (every 5 weeks vs every 3 months). On rating, ratings volume, ads and in-app purchases there is nothing between them.

firefly is free to download; Rhythm Note costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 5.0 for firefly against 5.0 for Rhythm Note. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

firefly ships an update every 3 months, Rhythm Note every 5 weeks. The most recent releases landed on October 10, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | firefly | Rhythm Note |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/firefly/id6740244732/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/rhythm-note/id6743887073/reviews) |
| Number of ratings | 1 | 1 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 5 weeks** |
| Monetization | **Free** | Paid |
| Size | 133 MB | 32 MB |
| Requires iOS | **14.0** | 15.3 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [NIO Group](https://appshunter.io/developer/1829590773) | [嘉成 梁](https://appshunter.io/developer/1803830905) |

## What reviewers say

### firefly

[App page](https://appshunter.io/ios/app/firefly/id6740244732)

This app enhances the driving experience for smart, premium electric cars designed for urban environments. It offers convenience features for users of these modern vehicles.

**Highlights:** Smart electric car integration, Premium urban vehicle features, Enhanced driving convenience, Modern lifestyle mobility

**Features:** Apple Wallet

**In-app purchases:** none


### Rhythm Note

[App page](https://appshunter.io/ios/app/rhythm-note/id6743887073)

Track and analyze your physical, emotional, and intellectual cycles to make informed decisions. Offers personalized advice and data visualization based on scientific biorhythm theory. Supports multiple users and prioritizes local data storage for privacy.

**Highlights:** Calculate biorhythm indices, Visualize cycle trends, Personalized activity suggestions, Multi-user support, Local data storage, Trend prediction curves

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is firefly free?

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

### Is Rhythm Note free?

Rhythm Note costs $3.99, with no in-app purchases.

### Which has better reviews, firefly or Rhythm Note?

firefly and Rhythm Note are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.

### Do firefly or Rhythm Note have ads?

Neither firefly nor Rhythm Note shows ads.

### Which is updated more often, firefly or Rhythm Note?

firefly ships an update every 3 months, and Rhythm Note every 5 weeks. Most recently, firefly was updated on October 10, 2026 and Rhythm Note on September 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.*