# Synapse vs Hello Klean

The clearest difference is update cadence: Hello Klean at every 5 weeks against Synapse's every 7 months. Synapse's advantage is iOS requirement (12.1 vs 18.5). On price, ads, 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.

Synapse ships an update every 7 months, Hello Klean every 5 weeks. The most recent releases landed on October 10, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | Synapse | Hello Klean |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.0 (1 ratings)](https://appshunter.io/ios/app/hello-klean/id6751104241/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 5 weeks** |
| Monetization | — | Free |
| Size | 78 MB | 15 MB |
| Requires iOS | **12.1** | 18.5 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Zinc Digital](https://appshunter.io/developer/1147605401) | [Helloklean Ltd.](https://appshunter.io/developer/1833435525) |

## What reviewers say

### Synapse

[App page](https://appshunter.io/ios/app/synapse-graff/id1567939772)

**Features:** macOS Compatibility

**In-app purchases:** none


### Hello Klean

[App page](https://appshunter.io/ios/app/hello-klean/id6751104241)

This app works with a special shower head to monitor filter life, water temperature, and your showering habits. It provides insights into how your routine impacts your hair and skin, offering guidance for healthier results.

**Highlights:** Filter life tracking, Heat alerts, Manage refills, Shower insights, Hair and skin insights, NFC connectivity

**In-app purchases:** none


## Frequently asked questions

### Is Synapse free?

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

### Is Hello Klean free?

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

### Do Synapse or Hello Klean have ads?

Neither Synapse nor Hello Klean shows ads.

### Which is updated more often, Synapse or Hello Klean?

Synapse ships an update every 7 months, and Hello Klean every 5 weeks. Most recently, Synapse was updated on October 10, 2026 and Hello Klean 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.*