# KoiControl - The Koi App — Koi, Water Quality & Pond

> Digital koi management, water quality tracking, and feeding calculator for pond owners. (iPhone/iPad app by Make IT Simple GmbH.)

- Source: https://appshunter.io/ios/app/koicontrol-the-koi-app/id1558517332 (this page in markdown: same URL + `.md`)
- Developer: [Make IT Simple GmbH](https://appshunter.io/developer/1820364433)
- Category: Lifestyle, Utilities
- Price: Free with in-app purchases
- Rating: 4.70/5 from 10 App Store ratings · 38 written reviews indexed
- Age rating: 4+
- Requires: iOS 13.0 · 85 MB
- Languages: Dutch, English, German, Indonesian, Spanish
- Released: 2021-04-23
- Data updated: 2026-07-02
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/koicontrol-the-koi-app/id1558517332/reviews.md

## What is KoiControl?

Put an end to paperwork! With KoiControl the annoying process of writing down water parameters and koi data on paper has finally come to an end. Additionally, KoiControl helps you to determine the right amount of food for your koi population.

After downloading the app for free you will first use a trial version with limited functionality. This allows you to get a better impression of the app and, if you like it, you can unlock all features by purchasing the premium version for your account. This is a yearly subscription, which helps us to develop more features for you and enables you to store as many entries as you wish on our servers. Read more below to get an overview of KoiControl's benefits:


Keep an eye on your water parameters!
As a pond owner, it is important to regularly measure your water parameters to ensure the well-being of your fish. With KoiControl you always keep an eye on all parameters. The app analyzes your water parameters and gives you suggestions on how to improve them if necessary.

Manage and track your koi!
Create your koi as profiles in the app to always keep an overview of your koi population. You can save all important information about your fish, such as name, variety, age, size, weight and much more. The built-in growth history makes it easy to see how well your koi have grown.

Ensure ideal growth!
Healthy and strong growth is the desire of every koi keeper. Through our built-in food calculator you can calculate the ideal amount of food. Based on your koi population and the water temperature, the recommended food quantity for your growth ambitions is calculated automatically. You don't even need to know the weight of your fish, as KoiControl determines this very accurately based on the length of the fish.

Recognize developments early!
The growth of your fish and the water quality of your pond are very important for you as a koi owner. How nice would it be to see trends and developments in your water measurements and koi growth at an early stage? Thanks to our automatically generated charts you can easily see trends and the potential of your koi. It is also possible to create a PDF file so that you can share your success with others or create a seasonal report.

Manage your ponds!
The essential information of your pond can be stored in the app. This includes e.g. volume, circulation rate or the deepest point. Even multiple ponds are not a problem. You can clearly assign fish and water measurements to the respective pond.

Enjoy the app on all your devices!
You own more than one device on which you want to use the app? A KoiControl account enables you to manage your stored data on all your devices. Of course, you can also use the app without an account and then transfer your data at a later time.

Can also be used offline!
No WiFi at the pond? No problem, our app can of course also be used without an internet connection.


Terms of use / EULA:  https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

## Key features

- Water parameter tracking and analysis
- Koi profile creation and growth history
- Automated food calculator
- Trend analysis with charts
- Multiple pond management
- Offline functionality

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| KoiControl premium version | $17.99 | per year |
| Koi Dealer Bronze | $14.99 | per month |
| Koi Dealer Silver | $17.99 | per month |
| Koi Dealer Gold | $24.99 | per month |
| KoiControl premium version | $11.99 | per year |


## Recent user reviews (10 of 38)

All indexed reviews: https://appshunter.io/ios/app/koicontrol-the-koi-app/id1558517332/reviews.md

### 1/5 — Fehlende Neuerungen

*2025-06-05*

Leider tut sich seit langen nichts mehr und auf Anfragen wird nicht geantwortet. Das einzige was sich tut ist der Betrag der jährlich abgezogen wird. Echt schade eigentlich

### 4/5 — Super Unterstützung mit Lücken

*2025-04-22*

Wirklich eine einfach zu bedienende App. Jedoch lassen sich die eingetragenen Wasserwerte nicht immer speichern. Ohne Grund sind die gerade eingetragenen Wasserwerte einfach nicht gespeichert worden. Auch eine 2,3 oder viermalige Wiederholung führt zu keinem Erfolg. Warum dies so ist, lässt sich nicht erklären. Irgendwann später ist es dann im Laufe des Tages möglich die Werte zu speichern. Gerne würde ich auch mehr Zeilen zur Verfügung haben, um die Wasserqualität zu beschreiben. Hier sind jedoch nur vier kurze Zeilen möglich. Es fehlt auch eine Anzeige ab wann es zu viele Wörter sind. Auch hier gibt es keinen Hinweis auf einen möglichen Fehler durch den Anwender. Es lässt sich einfach nur nicht speichern und man probiert sich dann durch, bis man selbst auf den Fehler trifft.

### 5/5 — App

*2025-03-27, version 4.8.0*

Just started using this app I think it’s great love the way it is so easy to use and stores all the pictures and details thank you

### 4/5 — Some functions I can’t get to work

*2025-02-05*

This app is so far great and I think underrated for what it can do and keep track of, but there’s a few things advertised that I can’t figure out how to work. One of these features being the Food Calculator feature. Does it require certain water parameters to be filled out in the app or does it require some other data to be put in besides the details about the size and weight of the koi? I’m more posting this review as a way to get an answer but I would definitely recommend this app to other koi hobbyists  who need/want a way to keep track of their koi in their phone.

### 5/5 — Nice app

*2024-08-11, version 4.8.0*

Nice and good app but TDS isnt their yet to follow up

### 3/5 — Need more storage

*2024-07-31*

Love the app but it only holds 50 fish. What do I do if I have more than 50?

### 5/5 — Koi Control

*2023-12-31, version 4.6.0*

I was shown this app by a friend and Cannot recommend this enough.
It comes down to you to add the info and input your koi log this is a must to get the best out the app. 10/10 guys

### 4/5 — Fantastic App

*2023-10-25, version 4.4.2*

I love this app, but can we have a medication page and the facility to print out the My Koi page.
Very useful and soo easy to use. Well done, keep up the good work.
Alan

### 4/5 — Blank screen

*2023-09-02, version 4.2.1*

I like this app and it has worked very well for me. 
BUT I am now having issues with a blank screen when I open up any of my history.  My water parameters will only let me input new tests, I can no longer see anything once it has been imported.  Would appreciate some advice 
Thanks
Steve

### 5/5 — This is great app.

*2023-08-21*

I’m new to caring for a pond and this helps me keep up with the water control and see patterns before they become an issue.

**Developer response:** Awesome, thank you for your feedback!

## Frequently asked questions about KoiControl

### What does KoiControl do?

KoiControl is a mobile application designed to help koi keepers and pond owners manage their fish and water quality digitally. It allows you to track water parameters, create profiles for your koi, calculate ideal feeding amounts, and monitor growth trends.

### What are the key features of KoiControl?

Key features include tracking and analyzing water parameters with suggestions for improvement, managing individual koi with detailed profiles and growth history, an automated food calculator based on koi population and water temperature, and the ability to manage multiple ponds. It also offers trend analysis through charts and offline functionality.

### How much does KoiControl cost?

The app can be downloaded for free and offers a trial version with limited functionality. To unlock all features and store unlimited entries on servers, a yearly subscription to the premium version is available for purchase.

### Is KoiControl compatible with my devices and can I use it offline?

Yes, KoiControl allows you to manage your stored data across all your devices with a KoiControl account. The app can also be used without an internet connection, making it convenient to use even when you don't have WiFi at your pond.

### What are common use cases for KoiControl?

Common use cases include regularly monitoring and improving pond water quality, tracking the growth and health of individual koi, ensuring optimal feeding to promote healthy growth, and identifying trends in water parameters and fish development early on.

## Version history (last 5 releases)

### 5.0.0 — 2025-06-22

- Added push buttons to increment/decrement slider values for finer control

- Introduced quick-set buttons for selecting predefined values with a single click

- Added support for ZAR (South African Rand) currency

### 4.9.0 — 2025-06-15

Improved performance and compatibility with newer devices.

### 4.8.0 — 2024-06-01

Improved the app performance for pages with a lot of entries.

### 4.7.0 — 2024-05-16

Update koi pictures according to newest entry in growth history

### 4.6.0 — 2023-12-30

Small adjustments of about us page

## Apps similar to KoiControl

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Worx Landroid](https://appshunter.io/ios/app/worx-landroid/id1350731032) | 2.7 (252) | Free | Lifestyle |
| [HYPRO WATER App](https://appshunter.io/ios/app/hypro-water-app/id1442061679) | — | Free | Lifestyle |
| [Dogtales: Dog Diary](https://appshunter.io/ios/app/dogtales-dog-diary/id6468829982) | — | Free | Lifestyle |
| [PetLog – Pet Health Journal](https://appshunter.io/ios/app/petlog-pet-health-journal/id6747721421) | — | Free | Lifestyle |
| [Tick Finder & Logger: Tickly](https://appshunter.io/ios/app/tick-finder-and-logger-tickly/id6747728881) | — | Free | Lifestyle |
| [Miele app – Smart Home](https://appshunter.io/ios/app/miele-app-smart-home/id930406907) | 4.1 (3,357) | Free | Lifestyle |

## More apps by Make IT Simple GmbH

- [Vivalpin Skischule](https://appshunter.io/ios/app/vivalpin-skischule/id6474937865)

All apps by Make IT Simple GmbH: https://appshunter.io/developer/1820364433

---

*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-02.*