# GDDTracker vs SoilIQ

The clearest difference is monetization model: SoilIQ at free with in-app purchases against GDDTracker's subscription. SoilIQ also leads on rating (5.0 vs 4.7). On price, review sentiment, ratings volume and update cadence there is nothing between them.

Both are free to download. GDDTracker sells 2 in-app purchases, starting at $0.99 per month and SoilIQ sells 2 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

SoilIQ holds the better App Store score, 5.0 against 4.7. Both are backed by a comparable volume of ratings — 13 and 22 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

GDDTracker ships an update every 2 days, SoilIQ every 4 days. The most recent releases landed on October 30, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | GDDTracker | SoilIQ |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (13 ratings)](https://appshunter.io/ios/app/gddtracker/id6752981800/reviews) | **[5.0 (22 ratings)](https://appshunter.io/ios/app/soiliq-soil-temperature/id6761371888/reviews)** |
| Number of ratings | 13 | **22** |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 2 days** | Every 4 days |
| Monetization | Subscription | **Free with in-app purchases** |
| Size | 15 MB | 21 MB |
| Requires iOS | 17.6 | 17.6 |
| Devices | iPhone, Apple Watch | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Kirk Faris](https://appshunter.io/developer/1842027731) | [Teddy Mutterperl](https://appshunter.io/developer/1771207680) |

## What reviewers say

### GDDTracker

[App page](https://appshunter.io/ios/app/gddtracker/id6752981800)

This app calculates Growing Degree Days (GDD) using hyper-local weather data to help you precisely time lawn care applications. It also logs applications, provides smart reminders, and includes profiles for over 50 grass varieties.

**Highlights:** Growing Degree Day (GDD) calculation and forecasting, Application logging with product details and notes, Smart reminders based on GDD, days, or soil temp, 50+ grass variety profiles, Rate calculator for product amounts, Multiple lawn management, CSV/PDF record export

**Features:** Apple Watch app

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $0.99 | per month |
| Annual | $9.99 | per year |


### SoilIQ

[App page](https://appshunter.io/ios/app/soiliq-soil-temperature/id6761371888)

This app provides data-driven insights for gardening and lawn care. It uses soil temperature, forecasts, and AI to guide planting, watering, and maintenance decisions. Features include calculators for materials and nutrients, and a journal to track activities.

**Highlights:** Soil temperature monitoring, 14-day soil forecasts, PlantAI for crop readiness, LawnIQ for lawn care guidance, Material and nutrient calculators, Activity and field journal, Apple Watch and Siri integration

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| SoilIQ Pro Monthly | $4.99 | per month |
| SoilIQ Pro Annual | $29.99 | per year |


## Frequently asked questions

### Is GDDTracker free?

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

### Is SoilIQ free?

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

### Which has better reviews, GDDTracker or SoilIQ?

SoilIQ is rated higher. GDDTracker averages 4.7 out of 5 from 13 ratings, while SoilIQ averages 5.0 from 22 ratings.

### Do GDDTracker or SoilIQ have ads?

Neither GDDTracker nor SoilIQ shows ads.

### Which is updated more often, GDDTracker or SoilIQ?

GDDTracker ships an update every 2 days, and SoilIQ every 4 days. Most recently, GDDTracker was updated on October 30, 2026 and SoilIQ on October 31, 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.*