# Pond: Koi Chemistry — Ammonia, nitrite, KH & salt

> Ammonia, nitrite, KH & salt (iPhone/iPad app by Roman Kopaliani.)

- Source: https://appshunter.io/ios/app/pond-koi-chemistry/id6777459595 (this page in markdown: same URL + `.md`)
- Developer: [Roman Kopaliani](https://appshunter.io/developer/1635315269)
- Category: Utilities, Lifestyle
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 1 MB
- Languages: American English, French (France), German (Germany), Italian, Japanese, Chinese (Simplified, China), European Spanish
- Released: 2026-06-11
- Data updated: 2026-08-28
- User reviews in markdown: https://appshunter.io/ios/app/pond-koi-chemistry/id6777459595/reviews.md

## What is Pond?

Free to download. Every Pro feature is free for 48 hours, then a single one-time unlock — no subscription, no ads, no account. Works offline.

Pond is the iOS koi pond chemistry assistant. Enter your test readings — pH, ammonia, nitrite, nitrate, KH, temperature — and get exact doses scaled to your pond volume. Brand-aware: pick the products on your shelf and Pond does the math.

Features
• Brand-aware dose math for Microbe-Lift, API Pondcare, Tetra Pond, and generics
• Test & Adjust: 6-parameter readings → brand-cited recommendations + plain-English advisories
• EPA free-ammonia equilibrium math (NH₃ from total ammonia, pH, temperature)
• KH crash warnings before pH collapses overnight
• Salt Bath calculator with 0.1% stress and 0.3% parasite targets
• Plant-safety warnings — flags when salt protocols would kill water lilies, lotus, and submerged plants
• Pond Volume estimator from length × width × average depth (rectangular or round)
• Seasonal hints — spring ammonia spikes, summer DO drops, fall leaf load, winter dormancy
• Locale-aware metric/imperial units (liters or gallons)
• Named-source citations: Pond Informer, Microbe-Lift, EPA, Play It Koi, Central California Koi Society
• Universal app for iPhone and iPad

For koi keepers who want exact doses from the products they already have. Backyard ponds 500–3,000 gallons / 2,000–10,000 liters.

No subscription, no ads, no account, no cloud. Free to download, with a one-time unlock for Pro. No subscription, no ads, no account, no cloud.

Privacy: Pond collects nothing. No analytics, no accounts, no network requests. Your settings live on your device.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Pond Pro (lifetime) | $3.99 | one-time |



## Version history (last 5 releases)

### 1.6 — 2026-08-18

• The Pro screens are now translated. They were English-only in every language the app ships — including yours.
• Store listing corrected: the app is free with an optional one-time unlock, and no longer advertises an old price.

### 1.5 — 2026-08-15

Maintenance update. No feature changes.

### 1.4 — 2026-07-24

• Fixed Restore Purchases so returning customers reliably get their unlock back
• The free trial now shows how much time is left

### 1.3 — 2026-07-02

New: a quick-jump list of related Moon Dog water-chemistry apps in Settings — reef, planted tank, pool and hot tub. Plus reliability improvements. Keep your koi water dialed in.

### 1.2 — 2026-06-25

Pond is now free to download with a 48-hour full-feature trial. Unlock every tool forever with a one-time Pond Pro purchase — no subscription. Existing owners keep full access automatically.

## Apps similar to Pond

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Defender Guard](https://appshunter.io/ios/app/defender-guard/id1471331497) | 4.6 (4,196) | Free | Utilities |
| [Carro Home](https://appshunter.io/ios/app/carro-home/id1481436593) | 4.4 (596) | Free | Utilities |
| [Simple Decision Maker](https://appshunter.io/ios/app/simple-decision-maker/id6757205323) | — | Free | Utilities |
| [BL,LLC](https://appshunter.io/ios/app/blllc/id6446366533) | 4.1 (17) | Free | Utilities |
| [Bethlehem Lts](https://appshunter.io/ios/app/bethlehem-lts/id6737045113) | 2.4 (9) | Free | Utilities |
| [Defender ClearVu](https://appshunter.io/ios/app/defender-clearvu/id6747126905) | 4.2 (18) | Free | Utilities |

## More apps by Roman Kopaliani

- [Soak: Hot Tub & Spa Calc](https://appshunter.io/ios/app/soak-hot-tub-and-spa-calc/id6775030424)
- [Frost: Cold Plunge Care](https://appshunter.io/ios/app/frost-cold-plunge-care/id6776702484)
- [Reef: Aquarium Chemistry Calc](https://appshunter.io/ios/app/reef-aquarium-chemistry-calc/id6776750986)
- [Watt: Solar for Van & RV](https://appshunter.io/ios/app/watt-solar-for-van-and-rv/id6777471058)
- [Saline: Saltwater Pool Calc](https://appshunter.io/ios/app/saline-saltwater-pool-calc/id6777715538)

All apps by Roman Kopaliani: https://appshunter.io/developer/1635315269

## Related topics

[pond pals](https://appshunter.io/ios/topics/pond-pals)

---

*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 2026-08-28.*