# TankDiary vs TankDiary

The clearest difference is device support: TankDiary at 3 against TankDiary's 1. TankDiary also leads on iOS requirement (15.0 vs 17.0). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. TankDiary sells 1 one-off in-app purchase and TankDiary sells 2 in-app purchases, starting at $9.99 per year. Whichever you choose, the download price is not the number that matters.

TankDiary ships an update every 6 days, TankDiary every 11 days. The most recent releases landed on October 25, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | TankDiary | TankDiary |
| --- | --- | --- |
| 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 6 days** | Every 11 days |
| Monetization | — | Free with in-app purchases |
| Size | 55 MB | 2 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [kazuki korenori](https://appshunter.io/developer/1884835388) | [TOBY M BERGER](https://appshunter.io/developer/6776950197) |

## What reviewers say

### TankDiary

[App page](https://appshunter.io/ios/app/tankdiary/id6762593557)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| TankDiary Pro | $5.99 | one-time |


### 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 |


## Frequently asked questions

### Is TankDiary free?

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

### Is TankDiary free?

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

### Do TankDiary or TankDiary have ads?

Neither TankDiary nor TankDiary shows ads.

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

TankDiary ships an update every 6 days, and TankDiary every 11 days. Most recently, TankDiary was updated on October 25, 2026 and TankDiary 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.*