# TankDiary vs ReefNote

The clearest difference is update cadence: TankDiary at every 11 days against ReefNote's every 3 weeks. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. TankDiary sells 2 in-app purchases, starting at $9.99 per year and ReefNote sells 3 in-app purchases, starting at $5.99 per month. Whichever you choose, the download price is not the number that matters.

TankDiary ships an update every 11 days, ReefNote every 3 weeks. The most recent releases landed on October 24, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | TankDiary | ReefNote |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/tankdiary-aquarium-tracker/id6788005172/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 11 days** | Every 3 weeks |
| Monetization | Free with in-app purchases | — |
| Size | 2 MB | 6 MB |
| Requires iOS | **17.0** | 18.0 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [TOBY M BERGER](https://appshunter.io/developer/6776950197) | [InnovaLabWorks](https://appshunter.io/developer/1888514726) |

## What reviewers say

### TankDiary

[App page](https://appshunter.io/ios/app/tankdiary-aquarium-tracker/id6788005172)

Easily track aquarium water parameters, schedule maintenance, and monitor your tank's health. This app helps you understand your tank's cycling stage and provides reliable reminders for water changes and other tasks. It offers detailed logging and historical charts for long-term trend analysis.

**Highlights:** Log water test results (ammonia, nitrite, nitrate, pH, etc.), Identify aquarium cycle stage, Schedule maintenance reminders (water changes, dosing), Water change calculator, Livestock and photo journal, Offline functionality, Interactive historical charts

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| TankDiary Pro — Yearly | $9.99 | per year |
| TankDiary Pro — Lifetime | $24.99 | one-time |


### ReefNote

[App page](https://appshunter.io/ios/app/reefnote-aquarium-log/id6788604575)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ReefNote Pro | $5.99 | per month |
| ReefNote Pro | $34.99 | per year |
| ReefNote Lifetime | $2.99 | one-time |


## Frequently asked questions

### Is TankDiary free?

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

### Is ReefNote free?

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

### Do TankDiary or ReefNote have ads?

Neither TankDiary nor ReefNote shows ads.

### Which is updated more often, TankDiary or ReefNote?

TankDiary ships an update every 11 days, and ReefNote every 3 weeks. Most recently, TankDiary was updated on October 24, 2026 and ReefNote on October 4, 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.*