# Weyerhaeuser Document Library vs NPK Calculator

The clearest difference is price: Weyerhaeuser Document Library at Free against NPK Calculator's $2.99. Weyerhaeuser Document Library also leads on rating (4.5 vs 3.3) and review sentiment (75% vs 33%). NPK Calculator's advantage is update cadence (monthly vs every 15 months). On ratings volume, ads, in-app purchases and device support there is nothing between them.

Weyerhaeuser Document Library is free to download; NPK Calculator costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Weyerhaeuser Document Library holds the better App Store score, 4.5 against 3.3. Both are backed by a comparable volume of ratings — 6 and 8 respectively. Written reviews point the same way: 75% of Weyerhaeuser Document Library's written reviews are positive against 33% of NPK Calculator's.

Weyerhaeuser Document Library ships an update every 15 months, NPK Calculator monthly. The most recent releases landed on September 10, 2026 and September 14, 2026 respectively.

## The numbers

| Metric | Weyerhaeuser Document Library | NPK Calculator |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Rating | **[4.5 (6 ratings)](https://appshunter.io/ios/app/weyerhaeuser-document-library/id738760952/reviews)** | [3.3 (8 ratings)](https://appshunter.io/ios/app/npk-calculator/id988554060/reviews) |
| Number of ratings | 6 | **8** |
| Positive reviews | **75.0% of reviews** | 33.3% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 15 months | **Monthly** |
| Monetization | **Free** | Paid |
| Size | 34 MB | 3 MB |
| Requires iOS | **15.1** | 18.5 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Weyerhaeuser NR Company](https://appshunter.io/developer/553029620) | [Anton Simonov](https://appshunter.io/developer/988554059) |

## What reviewers say

### Weyerhaeuser Document Library

[App page](https://appshunter.io/ios/app/weyerhaeuser-document-library/id738760952)

Access a comprehensive library of product literature, installation guides, and warranty information. Organize, download, and share documents for offline use. Syncs with your online account for seamless access.

**Highlights:** Browse and search document library, Filter by product category, Organize documents into custom binders, Download for offline viewing, Share document links, Syncs with Weyerhaeuser.com account

**Features:** macOS Compatibility

**In-app purchases:** none


### NPK Calculator

[App page](https://appshunter.io/ios/app/npk-calculator/id988554060)

This app helps optimize fertilizer solutions for plants by calculating the correct ratios of macronutrients and micronutrients. It aims to save money, prevent nutrient imbalances, and improve nutrient uptake for healthier plant growth in hydroponics or soil.

**Highlights:** Optimizes macronutrient and micronutrient ratios, Database of fertilizers, Nutrition programs from experienced growers, Saves money on fertilizer solutions, Prevents fertilizer burns and nutrient lock-out, Optimizes nutrient uptake

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

**In-app purchases:** none


## Frequently asked questions

### Is Weyerhaeuser Document Library free?

Weyerhaeuser Document Library is free to download, with no in-app purchases.

### Is NPK Calculator free?

NPK Calculator costs $2.99, with no in-app purchases.

### Which has better reviews, Weyerhaeuser Document Library or NPK Calculator?

Weyerhaeuser Document Library is rated higher. Weyerhaeuser Document Library averages 4.5 out of 5 from 6 ratings, while NPK Calculator averages 3.3 from 8 ratings.

### Do Weyerhaeuser Document Library or NPK Calculator have ads?

Neither Weyerhaeuser Document Library nor NPK Calculator shows ads.

### Which is updated more often, Weyerhaeuser Document Library or NPK Calculator?

Weyerhaeuser Document Library ships an update every 15 months, and NPK Calculator monthly. Most recently, Weyerhaeuser Document Library was updated on September 10, 2026 and NPK Calculator on September 14, 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.*