# ND Filter vs Crop

The clearest difference is in-app purchases: ND Filter at none against Crop's 1. Crop's advantage is update cadence (every 10 days vs every 5 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Crop sells 1 one-off in-app purchase. ND Filter asks for nothing beyond the download.

ND Filter ships an update every 5 months, Crop every 10 days. The most recent releases landed on October 17, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | ND Filter | Crop |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/crop-hydroponic-calculator/id6777968635/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 10 days** |
| Monetization | — | Free |
| Size | 41 MB | 1 MB |
| Requires iOS | 17.2 | **17.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Cubeon Solutions UG](https://appshunter.io/developer/1839630594) | [Roman Kopaliani](https://appshunter.io/developer/1635315269) |

## What reviewers say

### ND Filter

[App page](https://appshunter.io/ios/app/nd-filter/id6760582359)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Crop

[App page](https://appshunter.io/ios/app/crop-hydroponic-calculator/id6777968635)

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.

**Highlights:** 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

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Crop Pro (lifetime) | $4.99 | one-time |


## Frequently asked questions

### Is ND Filter free?

ND Filter is free to download, with no in-app purchases.

### Is Crop free?

Crop is free to download, with in-app purchases available.

### Do ND Filter or Crop have ads?

Neither ND Filter nor Crop shows ads.

### Which is updated more often, ND Filter or Crop?

ND Filter ships an update every 5 months, and Crop every 10 days. Most recently, ND Filter was updated on October 17, 2026 and Crop on October 20, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*