Pond: Koi Chemistry
Ammonia, nitrite, KH & salt
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
Brand-aware koi pond chemistry. Microbe-Lift, API Pondcare, Tetra Pond doses, EPA free-ammonia math, salt-bath safety. Pay once. No subscription.
Pay once. 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.
$3.99 one-time. 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.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Maintenance update. No feature changes.
The developer, Roman Kopaliani, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Roman Kopaliani
- Size
- 1 MB
- Category
- Utilities
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
English and 6 more
- English, French, German, Italian, Japanese, Simplified Chinese, Spanish
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Pond Pro (lifetime) $3.99
- Copyright
- © 2026 Roman Kopaliani