Actually get my ppm right now
used to keep a messy spreadsheet for my res and still mess it up half the time. this does it in like 10 seconds. wish i found it before i cooked a whole batch of lettuce lol
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About
This app calculates hydroponic nutrient recipes for various plants and growth stages, citing primary research sources. It helps growers determine salt weights for specific reservoir volumes and track EC/pH levels.
✓Plant and stage-specific nutrient targets
✓Cited primary source recipes
✓Branded nutrient solution recipes
✓Target to salt-weight solver
✓Reverse calculation for used salts
✓Multi-reservoir EC/pH logging
✓Shareable mix sheets
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What's New in Crop
1.5
July 25, 2026
• Fixed Restore Purchases so returning customers reliably get their unlock back • The free trial now shows how much time is left
1
In-App Purchases
$4.99
Crop Pro (lifetime)
Full nutrient calc, reservoirs & crop targets.
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FAQ
What plants does Crop support?
Crop supports a variety of plants including lettuce, tomato, basil, leafy herbs, cucumber, pepper, strawberry, leafy greens, and microgreens. Specific recipes are fully cited for lettuce, tomato, and herbs, with broader guidance for others.
Where do Crop's recipes come from?
Recipes in Crop are sourced from primary research institutions like Cornell CEA, Penn State Extension, and UF/IFAS, as well as Produce Grower. This ensures the published recipes behind the calculations are verifiable.
How does Crop calculate nutrient amounts?
Crop uses the Resh / Mattson sequential satisfy textbook method. You can enter your reservoir volume and a target ppm, or select a plant and stage, and Crop will calculate the exact grams of each salt to mix.
Can Crop help me track my reservoir's condition?
Yes, Crop offers multi-reservoir EC + pH logging. You can track separate reservoirs, log readings over time, and receive drift warnings cited to published sources.
What units does Crop support?
Crop provides unit flexibility for US gallons or liters, grams or ounces, and EC scales of 500, 640, or 700 to match common meters and tables.
Is Crop suitable for beginners?
While Crop provides detailed, cited information, its focus on scientific sources and precise calculations makes it most valuable for experienced growers. Beginners may find the depth of information requires some prior knowledge.
How often is Crop updated?
The latest version, 1.2, was released on July 2, 2026, indicating active development. Users can expect updates to maintain accuracy and potentially add new features or plant data.
Does Crop have ads?
No, Crop does not contain advertisements. It is a free application focused on providing utility without intrusive ads.