# ReefDiary vs Reefly

The clearest difference is update cadence: Reefly at daily against ReefDiary's every 4 weeks. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. ReefDiary sells 3 in-app purchases, starting at $2.99 per 7 days and Reefly sells 2 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.

ReefDiary ships an update every 4 weeks, Reefly daily. The most recent releases landed on October 28, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | ReefDiary | Reefly |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/reefdiary-aquarium-log/id6762562058/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 4 weeks | **Daily** |
| Monetization | Freemium | — |
| Size | 9 MB | 3 MB |
| Requires iOS | **17.0** | 18.6 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Petr Persianov](https://appshunter.io/developer/1883368529) | [Justinas Kristopaitis](https://appshunter.io/developer/1812310636) |

## What reviewers say

### ReefDiary

[App page](https://appshunter.io/ios/app/reefdiary-aquarium-log/id6762562058)

Track saltwater aquarium parameters, calculate precise dosing, and visualize trends to maintain a stable reef environment. This app offers offline functionality and local data storage for reef keepers.

**Highlights:** Log aquarium parameters, Dosing calculator, Parameter trend charts, Exportable reports, Multiple tank support, Offline functionality

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ReefTrack Pro – Weekly | $2.99 | per 7 days |
| ReefTrack Pro – Monthly | $7.99 | per month |
| ReefTrack Pro – Yearly | $29.99 | per year |


### Reefly

[App page](https://appshunter.io/ios/app/reefly/id6766267836)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ReefLog Pro | $3.99 | per month |
| ReefLog Pro | $17.99 | per year |


## Frequently asked questions

### Is ReefDiary free?

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

### Is Reefly free?

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

### Do ReefDiary or Reefly have ads?

Neither ReefDiary nor Reefly shows ads.

### Which is updated more often, ReefDiary or Reefly?

ReefDiary ships an update every 4 weeks, and Reefly daily. Most recently, ReefDiary was updated on October 28, 2026 and Reefly on October 11, 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.*