# Technology Readiness Levels vs GroGuild

The clearest difference is in-app purchases: Technology Readiness Levels at none against GroGuild's 1. GroGuild's advantage is update cadence (every 3 weeks vs every 8 months) and device support (3 vs 1). On price and ads there is nothing between them.

Both are free to download. GroGuild sells 1 one-off in-app purchase. Technology Readiness Levels asks for nothing beyond the download.

Technology Readiness Levels ships an update every 8 months, GroGuild every 3 weeks. The most recent releases landed on October 21, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Technology Readiness Levels | GroGuild |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/technology-readiness-levels/id644843941/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 3 weeks** |
| Monetization | Free | — |
| Size | 1 MB | 83 MB |
| Requires iOS | 26.0 | **16.0** |
| Devices | iPhone | **iPhone, iPad, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Russell Shannon](https://appshunter.io/developer/505317310) | [Adrian Grochla](https://appshunter.io/developer/1867881364) |

## What reviewers say

### Technology Readiness Levels

[App page](https://appshunter.io/ios/app/technology-readiness-levels/id644843941)

Quickly access definitions and descriptions for Department of Defense and NASA Technology Readiness Levels (TRLs). Understand the distinctions between different TRL stages and their supporting information.

**Highlights:** DoD and NASA TRL definitions, Detailed descriptions for each TRL, Supporting information (DoD), SETR Process alignment (DoD), Quick reference guide

**In-app purchases:** none


### GroGuild

[App page](https://appshunter.io/ios/app/groguild-permaculture-planner/id6760304627)

**Features:** Family Sharing, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| GroGuild Pro | $3.99 | one-time |


## Frequently asked questions

### Is Technology Readiness Levels free?

Technology Readiness Levels is free to download, with no in-app purchases.

### Is GroGuild free?

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

### Do Technology Readiness Levels or GroGuild have ads?

Neither Technology Readiness Levels nor GroGuild shows ads.

### Which is updated more often, Technology Readiness Levels or GroGuild?

Technology Readiness Levels ships an update every 8 months, and GroGuild every 3 weeks. Most recently, Technology Readiness Levels was updated on October 21, 2026 and GroGuild on October 25, 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.*