WetMath vs ReefDiary
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
WetMath
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Stop guessing and start measuring. WetMath is the essential tool for freshwater and reef tank hobbyists who demand precision. Whether youβre aquascaping a new build or maintaining a delicate coral reef, WetMath provides the exact calculations you need to succeed. +1 ## Why WetMath? Built for Reefers & Aquarists: Specialized tools for salt mix adjustments, dosing, and flow rates. Simplified Planning: Calculate tank volume, substrate weight, and heater requirements in seconds. Save Money: Estimate your power costs and evaporation loss to optimize your setup. Privacy First: No accounts. No cloud. No tracking. Your data stays on your device. ## Essential Hobbyist Tools: Volume & Weight: Exact water and glass weight calculations for safety. Dosing & Chemistry: Salt mix adjustments (SG) and water weight conversions. Equipment Optimization: Pump flow, turnover rates, and heating/cooling needs. Substrate Calculator: Determine exactly how much sand or gravel you need. Operational Math: Evaporation estimators and power cost calculators. ## Universal Support Full support for both US Customary and Metric units. Designed for efficiency so you can spend less time on math and more time enjoying your aquatic life. Privacy Here is what we collect and why: App performance data: device type, OS version, app version, and coarse location derived from public IP address. This helps us understand where the app is being used, which devices are in use, and which app versions are active. This data is retained for up to 90 days on servers we control. Google Firebase Analytics: anonymized usage data, including screen views, used to understand which features are used and how often. Google Mobile Ads: the free version of the app displays banner ads. If tracking is disabled, ads may be less relevant. If tracking is allowed, ads may be more relevant. WireStix Pro removes ads. Support contact information: if you contact support, you may provide your name and email address so we can reply. We do not use support emails for tracking. Support emails are deleted when no longer needed, or within 2 years. Safety We use analytics and operational data to detect abuse, scraping, misuse, and other activity that could interfere with the app or our systems.
ReefDiary
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Log saltwater aquarium parameters, spot stability drift, calculate dosing amounts, and keep reef care decisions grounded in your own data. KEY FEATURES: - Log Ca, Alk, Mg, pH, Salinity, Temp, NO3, PO4 in seconds - 2-part dosing calculator (BRS, ESV, Tropic Marin, custom) - Color-coded parameter cards show instant health status - Trend charts reveal drift, recovery, and repeat patterns - Exportable reports for second opinions, store visits, or support threads - Multiple tank support with separate histories and routines BUILT FOR REEF KEEPERS: - No account required, no cloud sync; reef data stays local - Works offline - practical for fish rooms and maintenance benches - Dense, scannable interface designed for daily reef checks PRO FEATURES (monthly, yearly, or lifetime): - Unlimited tanks and full long-range parameter history - Advanced dosing products and custom formulas - CSV exports and shareable reef detail images - Custom testing cadence and dosing follow-through Free to download. Pro unlocks the long view: full history, reports, formulas, routines, and unlimited reef systems. LEGAL: - Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ - Privacy Policy: https://peachuinc.github.io/legal/reefdiary/
Screenshots
Verdict
The clearest difference is ads: ReefDiary at none against WetMath's shown. WetMath's advantage is update cadence (weekly vs every 4 weeks) and iOS requirement (15.6 vs 17.0). On price, in-app purchases and device support there is nothing between them.
Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS
Both are free to download. WetMath sells 2 one-off in-app purchases and ReefDiary sells 3 in-app purchases, starting at $2.99 per 7 days. Whichever you choose, the download price is not the number that matters.
WetMath ships an update weekly, ReefDiary every 4 weeks. The most recent releases landed on August 11, 2026 and September 10, 2026 respectively.
| Parameter | WetMath | ReefDiary |
|---|---|---|
| Price | Free | Free |
| Update frequency | Weekly β better | Every 4 weeks |
| Ads | Yes | No β better |
| In-app purchases | Yes | Yes |
| Devices | iPhone, iPad, iPod β better | iPhone, iPad |
| Requires iOS | 15.6 β better | 17.0 |
| Further details β not scored | ||
| Size | 47 MB | 9 MB |
| Age rating | 4+ | 4+ |
| Developer | NanoHawk | Petr Persianov |
In-app purchases
WetMath
- WetMath Pro Unlock$0.99
- WetMathβ’ Pro Unlock$9.99
ReefDiary
- ReefTrack Pro β Weekly3 Days trial$2.997 Days
- ReefTrack Pro β Monthly3 Days trial$7.991 Month
- ReefTrack Pro β Yearly$29.991 Year









