# PGR Calculator vs Phytech Frost

The clearest difference is rating: PGR Calculator at 3.3 against Phytech Frost's 3.0. PGR Calculator also leads on iOS requirement (10.2 vs 15.1). On price, ratings volume, update cadence and ads there is nothing between them.

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

PGR Calculator holds the better App Store score, 3.3 against 3.0. Both are backed by a comparable volume of ratings — 4 and 2 respectively.

PGR Calculator ships an update every 4 months, Phytech Frost every 3 months. The most recent releases landed on October 23, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | PGR Calculator | Phytech Frost |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.3 (4 ratings)](https://appshunter.io/ios/app/pgr-calculator/id387478358/reviews)** | [3.0 (2 ratings)](https://appshunter.io/ios/app/phytech-frost/id1582696544/reviews) |
| Number of ratings | **4** | 2 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 months** |
| Monetization | Free | Free |
| Size | 17 MB | 75 MB |
| Requires iOS | **10.2** | 15.1 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [OHP, Inc.](https://appshunter.io/developer/387478361) | [Phytech, LTD](https://appshunter.io/developer/889024733) |

## What reviewers say

### PGR Calculator

[App page](https://appshunter.io/ios/app/pgr-calculator/id387478358)

This app simplifies the calculation of plant growth regulators (PGRs) for field applications. It helps users determine the correct rates for spray or drench applications based on desired dosage and area size, ensuring accurate product and solution amounts.

**Highlights:** Calculate PGR rates for spray applications, Calculate PGR rates for drench applications, Enter desired dose and application area, Calculate solution and product amounts, Access SDS sheets and product labels

**Features:** macOS Compatibility

**In-app purchases:** none


### Phytech Frost

[App page](https://appshunter.io/ios/app/phytech-frost/id1582696544)

This application continuously monitors ambient temperature to provide real-time frost alerts. Receive instant push notifications to protect your assets from freezing conditions.

**Highlights:** Continuous temperature measuring, Real-time push notifications, Frost alerts, Temperature monitoring

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

**In-app purchases:** none


## Frequently asked questions

### Is PGR Calculator free?

PGR Calculator is free to download, with no in-app purchases.

### Is Phytech Frost free?

Phytech Frost is free to download, with no in-app purchases.

### Which has better reviews, PGR Calculator or Phytech Frost?

PGR Calculator is rated higher. PGR Calculator averages 3.3 out of 5 from 4 ratings, while Phytech Frost averages 3.0 from 2 ratings.

### Do PGR Calculator or Phytech Frost have ads?

Neither PGR Calculator nor Phytech Frost shows ads.

### Which is updated more often, PGR Calculator or Phytech Frost?

PGR Calculator ships an update every 4 months, and Phytech Frost every 3 months. Most recently, PGR Calculator was updated on October 23, 2026 and Phytech Frost on October 15, 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.*