# KoiLog: Koi Pond Tracker

> KoiLog: Koi Pond Tracker (iPhone/iPad app by TOBY M BERGER.)

- Source: https://appshunter.io/ios/app/koilog-koi-pond-tracker/id6788127388 (this page in markdown: same URL + `.md`)
- Developer: [TOBY M BERGER](https://appshunter.io/developer/6776950197)
- Category: Lifestyle
- Price: Free
- Age rating: 4+
- Requires: iOS 17.0 · 2 MB
- Languages: English
- Released: 2026-07-18
- Data updated: 2026-09-09
- User reviews in markdown: https://appshunter.io/ios/app/koilog-koi-pond-tracker/id6788127388/reviews.md

## What is KoiLog?

Your koi pond deserves a real logbook — private, offline, yours forever.

KoiLog keeps your whole pond in one fast, beautiful app that never asks for an account and never sends your data anywhere. No cloud. No tracking. If it's in KoiLog, it's on your phone — period.

WATER TESTS YOU CAN ACTUALLY READ
Log temperature, pH, ammonia, nitrite, nitrate, KH, GH, salt, dissolved oxygen and TDS in seconds. Every parameter gets its own chart with the koi-safe range shaded in, so a creeping ammonia problem is obvious before your fish feel it. Touch any chart to inspect a reading. Colored status dots and a "needs attention" summary on the pond card tell you instantly what's fine and what isn't.

POND CALCULATORS — FREE FOR EVERYONE
• Pond volume from dimensions (rectangular, circular, oval or irregular, feet or meters) — and save it straight to your pond.
• Pump turnover: is your pump moving enough water for koi?
• Treatment dosing: type the rate from the product label ("5 mL per 10 gal") and get the exact dose for your pond, split into as many doses as you like.
• Salt calculator with per-dose guidance.

FEED BY TEMPERATURE, NOT GUESSWORK
KoiLog reads your latest water temperature and tells you what to feed and how often — wheat-germ in cool water, growth food in summer, and a clear "do not feed" through winter dormancy.

EVERY KOI, EVERY INCH
Build your collection with 20+ varieties from Kohaku to Kumonryu. Track length and weight with growth charts, keep a photo timeline of each fish, and record purchase price and estimated value.

NEVER MISS MAINTENANCE
Water changes, filter cleans, UV bulbs, skimmer baskets — set the interval once and KoiLog reminds you, shows what's overdue, and keeps the full completion history.

ALSO
• Treatment log with active day counter
• Pond journal with photos
• °F/°C, gallons/liters, local currency
• Dark mode, haptics, VoiceOver support
• Start with a fully editable example pond in under a minute

KOILOG PRO (optional)
Free covers one pond, five koi, three tasks and 30 days of water history. KoiLog Pro unlocks unlimited ponds, koi and tasks, full water history, collection stats (value over time, growth leaderboard) and CSV export.
• Lifetime: $29.99 one-time purchase — not a subscription, never renews.
• Monthly: $2.99 per month, cancel anytime.
Payment is charged to your Apple ID account at confirmation of purchase. The monthly subscription renews automatically unless cancelled at least 24 hours before the end of the current period; manage or cancel it in your App Store account settings. Prices may vary by region.

Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy: https://tobyberg43.github.io/koilog-site/privacy.html

Made for koi keepers who'd rather be at the pond than fighting an app.


## Version history (last 3 releases)

### 1.2 — 2026-09-07

Pond Calculators — free for everyone:
• Pond volume from dimensions (rectangular, circular, oval or irregular), with one tap to save it to your pond. Also available while creating a pond.
• Pump turnover: see whether your pump moves enough water for koi.
• Treatment dosing: enter the rate from any product label and get the exact dose for your pond, split into as many doses as you like.

Also in this update:
• Water charts now scale to your readings, so small ammonia and nitrite changes are easy to see instead of a flat line.
• A clearer KoiLog Pro screen: what Pro unlocks, and Lifetime is a one-time purchase, not a subscription.
• Enjoying KoiLog? After a few logged tests we'll ask for a quick rating — once, and only once per version.

As always: no account, no cloud, no tracking. Your pond data stays on your device.

### 1.1 — 2026-07-24

KoiLog 1.1 is a big quality-of-life update:

• New here? A short welcome tour now explains KoiLog's privacy-first approach — and you can start with a fully editable example pond to explore charts, growth tracking, and tasks.
• Touch and drag any water chart to see the exact value and time of each reading.
• Photos are no longer dead ends: tap any koi or journal photo to view it full screen, with pinch-to-zoom and swiping between shots.
• Pond cards now surface what needs attention — out-of-range water readings and overdue tasks — right on the home screen.
• The temperature-based feeding guide is visible from day one, with a friendly prompt to log your first temperature.
• Search your koi (by name or variety) and your journal.
• Prices now display in your local currency.
• Collection Stats (Pro) got much richer: investment-over-time chart and a growth leaderboard.
• Tasks are easier to check off: a bigger complete button plus swipe-right to complete.
• KoiLog Pro Monthly now starts with a 7-day free trial.

As always: no account, no cloud, no tracking. Your pond data stays on your device.

### 1.0 — 2026-07-19

No release notes.

## More apps by TOBY M BERGER

- [CommitGraphics: Signing Day](https://appshunter.io/ios/app/commitgraphics-signing-day/id6776950195)
- [TankDiary: Aquarium Tracker](https://appshunter.io/ios/app/tankdiary-aquarium-tracker/id6788005172)
- [ReloadVault — Reloading Log](https://appshunter.io/ios/app/reloadvault-reloading-log/id6788529718)
- [ToneVault - Tone Saver](https://appshunter.io/ios/app/tonevault-tone-saver/id6788848231)
- [BonsaiLog: Bonsai Care Log](https://appshunter.io/ios/app/bonsailog-bonsai-care-log/id6789196023)

All apps by TOBY M BERGER: https://appshunter.io/developer/6776950197

---

*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 2026-09-09.*