# Aqualyser vs Logos

The clearest difference is update cadence: Aqualyser at every 5 weeks against Logos's every 6 months. 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.

Aqualyser ships an update every 5 weeks, Logos every 6 months. The most recent releases landed on June 25, 2026 and December 22, 2025 respectively.

## The numbers

| Metric | Aqualyser | Logos |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 6 months |
| Monetization | Free | — |
| Size | 76 MB | 21 MB |
| Requires iOS | 13.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [A4C sprl](https://appshunter.io/developer/1257067393) | [SOC GRANDE LOGE DE FRANCE](https://appshunter.io/developer/1644320000) |

## What reviewers say

### Aqualyser

[App page](https://appshunter.io/ios/app/aqualyser/id1512920908)

Easily care for your pond with this intuitive tool. Get detailed water analysis and expert advice to maintain clear, healthy water. Track your pond's evolution and share your findings.

**Highlights:** Add and manage your pond, Perform water analysis, Detailed parameter interpretation, Personalized improvement recommendations, Track water quality evolution, Share analysis results

**Features:** macOS Compatibility, Apple Wallet

**In-app purchases:** none


### Logos

[App page](https://appshunter.io/ios/app/logos/id1644319998)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Aqualyser free?

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

### Is Logos free?

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

### Do Aqualyser or Logos have ads?

Neither Aqualyser nor Logos shows ads.

### Which is updated more often, Aqualyser or Logos?

Aqualyser ships an update every 5 weeks, and Logos every 6 months. Most recently, Aqualyser was updated on June 25, 2026 and Logos on December 22, 2025.

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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.*