# Technology Readiness Levels vs SecureMyEmail

The clearest difference is rating: Technology Readiness Levels at 5.0 against SecureMyEmail's 3.5. Technology Readiness Levels also leads on in-app purchases (none vs 3). SecureMyEmail's advantage is update cadence (every 2 months vs every 8 months) and ratings volume (39 vs 2). On price and ads there is nothing between them.

Both are free to download. SecureMyEmail sells 3 in-app purchases, starting at $3.99 per month. Technology Readiness Levels asks for nothing beyond the download.

Technology Readiness Levels holds the better App Store score, 5.0 against 3.5. That said, the two scores are not equally well evidenced: SecureMyEmail has 39 ratings behind it against 2, so its average is the more settled of the two.

Technology Readiness Levels ships an update every 8 months, SecureMyEmail every 2 months. The most recent releases landed on October 21, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Technology Readiness Levels | SecureMyEmail |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/technology-readiness-levels/id644843941/reviews)** | [3.5 (39 ratings)](https://appshunter.io/ios/app/securemyemail/id1026199012/reviews) |
| Number of ratings | 2 | **39** |
| Positive reviews | — | 43.3% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 2 months** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 1 MB | 40 MB |
| Requires iOS | 26.0 | **15.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | +4 |
| Developer | [Russell Shannon](https://appshunter.io/developer/505317310) | [WiTopia](https://appshunter.io/developer/1026199011) |

## 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


### SecureMyEmail

[App page](https://appshunter.io/ios/app/securemyemail/id1026199012)

Easily encrypt any email address with military-grade, end-to-end encryption. Send secure messages and attachments to anyone, even if they don't use the app. Features include self-destructing messages and HIPAA/GDPR compliance.

**Highlights:** PGP email encryption for any address, End-to-end encrypted email and attachments, Self-destructing ephemeral messages, Zero-knowledge encryption, Manage multiple email addresses, HIPAA and GDPR compliant, Full PGP compatibility

**Features:** Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| SecureMyEmail | $3.99 | per month |
| SecureMyEmail | $29.99 | per year |
| SecureMyEmail Lifetime Plan | $99.99 | one-time |


## Frequently asked questions

### Is Technology Readiness Levels free?

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

### Is SecureMyEmail free?

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

### Which has better reviews, Technology Readiness Levels or SecureMyEmail?

Technology Readiness Levels is rated higher. Technology Readiness Levels averages 5.0 out of 5 from 2 ratings, while SecureMyEmail averages 3.5 from 39 ratings.

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

Neither Technology Readiness Levels nor SecureMyEmail shows ads.

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

Technology Readiness Levels ships an update every 8 months, and SecureMyEmail every 2 months. Most recently, Technology Readiness Levels was updated on October 21, 2026 and SecureMyEmail on October 24, 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.*