Frag: Aquarium & Reef Tracker
Water Care, Tests & Trend Log
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
Log water parameters in seconds. Spot trends before problems. One-time purchase — no subscription.
Stop guessing if your tank is stable. Frag logs water parameters in seconds, shows trend charts with safe range bands, and reminds you before maintenance slips.
▸ LOG 10 PARAMETERS IN 10 SECONDS
Tap a cell, type a number, move on. pH, ammonia, nitrite, nitrate, temp, salinity, alkalinity, calcium, magnesium, phosphate — all logged before your test kit dries.
▸ SPOT TRENDS BEFORE PROBLEMS
Every parameter gets a trend chart with safe range bands. See drift at a glance — not just "what's my pH today" but "is my pH dropping?"
▸ NEVER MISS A WATER TEST
Smart reminders for water changes, filter cleaning, dosing, and testing schedules. Frag keeps track so you don't have to remember.
▸ TRACK YOUR WHOLE FISH ROOM
Multiple tanks, each with its own parameters, maintenance schedule, and livestock. Switch between tanks in one tap.
▸ KNOW BEFORE YOU ADD
Compatibility warnings flag species conflicts before you buy. Stocking calculator shows when your tank is approaching capacity.
▸ CORRELATE PARAMETERS
Overlay charts let you see two parameters side by side — spot cause and effect between alk, calcium, pH, temp, and more.
▸ SHARE & EXPORT
Share trend charts as images. Export parameter history as CSV for your records or your LFS.
WHY FRAG?
• One-time purchase — no subscription, no recurring charges, yours forever
• Offline-first — works in your fish room with no wifi
• Fast — built for speed, not for upsells
• Beautiful — designed for dark mode, easy on the eyes at 2am
STANDARD
• 1 tank with full parameter logging
• Latest values dashboard
• Maintenance reminders
PRO
• Unlimited tanks
• Trend charts with safe range bands
• Parameter overlay charts
• Compatibility warnings
• Stocking calculator
• CSV export & chart sharing
Built by an aquarist who was tired of spreadsheets.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
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The developer, Andrew Osborne, 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 Linked to You
The following data may be collected but it is not linked to your identity:
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Andrew Osborne
- Size
- 32 MB
- Category
- Lifestyle
- Compatibility
Requires iOS 15.1 or later.
- iPhone
Requires iOS 15.1 or later. - iPod touch
Requires iOS 15.1 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Frag Pro $4.99
- Copyright
- © 2026 APQ Labs