# KoiApp — Koi & Pond Tracker — Water tests, growth, KoiDoctor

> Water tests, growth, KoiDoctor (iPhone/iPad app by Kai Bertelsen.)

- Source: https://appshunter.io/ios/app/koiapp-koi-and-pond-tracker/id6779963592 (this page in markdown: same URL + `.md`)
- Developer: [Kai Bertelsen](https://appshunter.io/developer/6779963594)
- Category: Lifestyle, Utilities
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 15.0 · 26 MB
- Languages: American English
- Released: 2026-06-27
- Data updated: 2026-09-06
- User reviews in markdown: https://appshunter.io/ios/app/koiapp-koi-and-pond-tracker/id6779963592/reviews.md

## What is KoiApp?

KoiApp is the complete app for koi keepers and breeders — track every fish, care
for your pond, and control it all from your phone. Part of the KoiSoft system.

Built for hobbyists and breeders alike, KoiApp brings your whole koi life into
one place.

• Studio ID cards — turn ordinary photos into stunning AI-generated studio
  portraits, each with its own digital certificate
• Growth tracking — log length and weight over time and follow every koi's
  growth curve
• Measure from a photo — mark a known reference and get an exact length without
  handling the fish
• Scan a fish — AI identifies species and variety and estimates size, then
  carries the fish straight into a KoiDoctor conversation
• Water tests — log temperature, pH, ammonia, nitrite, nitrate, KH and GH in
  under a minute, photograph the test strip, and see every value charted over time
• KoiDoctor — ask about health, symptoms and seasonal care, or have it read a
  water test: it weighs pH against KH, nitrite against temperature and stocking,
  and tells you what the situation actually is
• Feeding — plans that follow water temperature, fish size and the food you use
• Breeding — KoiMix weighs a pairing and shows the likely offspring; build a
  family tree with parents and offspring
• Marketplace — discover koi for sale from breeders, or list your own
• Ownership transfer — hand a koi to its new owner with the full history: photos,
  measurements, logs and water tests
• Smart hardware — connect KoiBox & KoiPlugg devices to monitor and control pump,
  UV, heating, lights, feeding and water level

Free to start. Upgrade to Premium for unlimited logging, 20 studio images per
month, multi-device control and more.

Terms of Use (EULA): https://koisoft.eu/terms
Privacy Policy: https://koisoft.eu/privacy

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| KoiSoft Premium | $4.99 | per month |
| KoiSoft Premium | $49.99 | per year |
| Extra storage | $7.99 | per year |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Studio images ×20 | $9.99 | one-time |



## Version history (last 2 releases)

### 1.0.1 — 2026-08-28

Water tests, and KoiDoctor reading them.

• Log temperature, pH, ammonia, nitrite, nitrate, KH and GH — every reading
  colour-coded as you type, and you can photograph the test strip as documentation
• See each value charted over time, with a checkbox per parameter so you choose
  what the graph shows
• Ask KoiDoctor to read a test: it weighs pH against KH and nitrite against
  temperature and stocking, uses your earlier tests to say which way things are
  moving, and answers in your language
• Edit or delete a test afterwards, and attach photos to it

Also in this version:
• Scanned a fish? Carry it straight into KoiDoctor — the conversation opens with
  the variety, size and photos already in it
• Share or save any photo from the full-screen viewer, straight to your camera roll
• The help centre has new guides on logging growth, measuring from a photo,
  scanning, and water tests
• Fixed: deleting a growth measurement now updates the length and weight shown in
  the fish list

### 1.0 — 2026-06-27

No release notes.

## Related topics

[koi fish breeding](https://appshunter.io/ios/topics/koi-fish-breeding) · [kookai](https://appshunter.io/ios/topics/kookai) · [koi fish](https://appshunter.io/ios/topics/koi-fish)

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*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 2026-09-06.*