# Growsafe Knapsack Spray Calc vs IDT Data Logger

The clearest difference is update cadence: IDT Data Logger at every 11 months against Growsafe Knapsack Spray Calc's every 92 months. On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Growsafe Knapsack Spray Calc ships an update every 92 months, IDT Data Logger every 11 months. The most recent releases landed on October 21, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | Growsafe Knapsack Spray Calc | IDT Data Logger |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.0 (1 ratings)](https://appshunter.io/ios/app/idt-data-logger/id1555614905/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 92 months | **Every 11 months** |
| Monetization | Free | Free |
| Size | 19 MB | 8 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Groundtruth Limited](https://appshunter.io/developer/894469722) | [Instruments & Data Tools Pty Ltd](https://appshunter.io/developer/1477164406) |

## What reviewers say

### Growsafe Knapsack Spray Calc

[App page](https://appshunter.io/ios/app/growsafe-knapsack-spray-calc/id1198797228)

Calculate the precise amount of agrichemical product needed for your spray tank to achieve a specific concentration. This tool simplifies complex calculations for agricultural applications.

**Highlights:** Calculate agrichemical product amounts, Achieve target spray concentrations, Simplify spray tank calculations, Designed for agricultural use

**Features:** macOS Compatibility

**In-app purchases:** none


### IDT Data Logger

[App page](https://appshunter.io/ios/app/idt-data-logger/id1555614905)

Manually record data points using user-defined labels and NFC tags. Capture tag information like number and description alongside your collected data. Share your recorded information across devices via AirDrop.

**Highlights:** Manual data recording, User-defined labels, NFC tag integration, Capture tag number and description, Data sharing via AirDrop

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Growsafe Knapsack Spray Calc free?

Growsafe Knapsack Spray Calc is free to download, with no in-app purchases.

### Is IDT Data Logger free?

IDT Data Logger is free to download, with no in-app purchases.

### Do Growsafe Knapsack Spray Calc or IDT Data Logger have ads?

Neither Growsafe Knapsack Spray Calc nor IDT Data Logger shows ads.

### Which is updated more often, Growsafe Knapsack Spray Calc or IDT Data Logger?

Growsafe Knapsack Spray Calc ships an update every 92 months, and IDT Data Logger every 11 months. Most recently, Growsafe Knapsack Spray Calc was updated on October 21, 2026 and IDT Data Logger on October 11, 2026.

---

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