# HydroTimer vs LunaNote Kit

The clearest difference is in-app purchases: HydroTimer at none against LunaNote Kit's 2. LunaNote Kit's advantage is update cadence (every 2 months vs every 10 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. LunaNote Kit sells 2 in-app purchases, starting at $6.99 per 7 days. HydroTimer asks for nothing beyond the download.

HydroTimer ships an update every 10 months, LunaNote Kit every 2 months. The most recent releases landed on October 22, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | HydroTimer | LunaNote Kit |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 10 months | **Every 2 months** |
| Size | 2 MB | 10 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Aurelis Limited](https://appshunter.io/developer/1821243565) | [SMJ Jewellery (HK) Limited](https://appshunter.io/developer/1721196677) |

## What reviewers say

### HydroTimer

[App page](https://appshunter.io/ios/app/hydrotimer/id6748376181)

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

**In-app purchases:** none


### LunaNote Kit

[App page](https://appshunter.io/ios/app/lunanote-kit-lite-tracker/id6751485002)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Week VIP | $6.99 | per 7 days |
| Year VIP | $39.99 | per year |


## Frequently asked questions

### Is HydroTimer free?

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

### Is LunaNote Kit free?

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

### Do HydroTimer or LunaNote Kit have ads?

Neither HydroTimer nor LunaNote Kit shows ads.

### Which is updated more often, HydroTimer or LunaNote Kit?

HydroTimer ships an update every 10 months, and LunaNote Kit every 2 months. Most recently, HydroTimer was updated on October 22, 2026 and LunaNote Kit on October 8, 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.*