# hai vs TimerLync

The clearest difference is ads: TimerLync at none against hai's shown. TimerLync also leads on update cadence (fortnightly vs monthly). hai's advantage is iOS requirement (13.0 vs 17.0). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

hai ships an update monthly, TimerLync fortnightly. The most recent releases landed on October 14, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | hai | TimerLync |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (100 ratings)](https://appshunter.io/ios/app/hai-smart-spa-shower-system/id1567377425/reviews)** | — |
| Number of ratings | **100** | — |
| Positive reviews | 97.4% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Monthly | **Fortnightly** |
| Monetization | Ad-supported | — |
| Size | 75 MB | 5 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | iPhone, iPod | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Gethai, Inc.](https://appshunter.io/developer/1567377817) | [JUKI JUNG](https://appshunter.io/developer/1212179274) |

## What reviewers say

### hai

[App page](https://appshunter.io/ios/app/hai-smart-spa-shower-system/id1567377425)

This app helps you install and manage a smart shower system. It tracks your water and energy usage, providing insights and tips to reduce environmental impact and encourage self-care rituals. Transform your daily shower into a mindful experience.

**Highlights:** Easy installation guide, Track water and energy usage, Customize LED eco-goal alerts, Mobile alerts for water temperature, At-home spa ritual inspiration

**In-app purchases:** none

**What reviewers like**

- 💡 App usefulness for shower head
- 👍 Easy to use and install
- 📈 Water usage tracking
- 💧 Water savings conscious
- ✨ Neat hydro turbine charging

**What reviewers complain about**

- 🐛 App connection issues
- 🐛 App doesn't always connect
- 🐛 Bluetooth requires phone nearby
- 🐛 Slight hum from impeller

**Reported bugs**

- App may connect or more often it won't
- Asks to check WiFi when it works sometimes

**Requested features**

- Push notifications for water use limit
- Wi-Fi connectivity instead of Bluetooth
- Infuse addons


### TimerLync

[App page](https://appshunter.io/ios/app/timerlync/id6795109124)

**Features:** Apple Watch app

**In-app purchases:** none


## Frequently asked questions

### Is hai free?

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

### Is TimerLync free?

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

### Do hai or TimerLync have ads?

hai shows ads; TimerLync does not.

### Which is updated more often, hai or TimerLync?

hai ships an update monthly, and TimerLync fortnightly. Most recently, hai was updated on October 14, 2026 and TimerLync 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.*