# Transparency Harm Reduction vs Fathom

The clearest difference is rating: Fathom at 4.8 against Transparency Harm Reduction's 3.7. Fathom also leads on ratings volume (508 vs 6) and update cadence (weekly vs every 3 weeks). Transparency Harm Reduction's advantage is in-app purchases (none vs 8) and ads (none vs shown). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Fathom sells 8 in-app purchases, starting at $6.99 per month. Transparency Harm Reduction asks for nothing beyond the download.

Fathom holds the better App Store score, 4.8 against 3.7. That said, the two scores are not equally well evidenced: Fathom has 508 ratings behind it against 6, so its average is the more settled of the two. Written reviews point the same way: 60% of Transparency Harm Reduction's written reviews are positive against 69% of Fathom's.

Transparency Harm Reduction ships an update every 3 weeks, Fathom weekly. The most recent releases landed on November 4, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Transparency Harm Reduction | Fathom |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.7 (6 ratings)](https://appshunter.io/ios/app/transparency-harm-reduction/id6504291757/reviews) | **[4.8 (508 ratings)](https://appshunter.io/ios/app/fathom-learn-philosophy/id6742149252/reviews)** |
| Number of ratings | 6 | **508** |
| Positive reviews | 60.0% of reviews | **69.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 3 weeks | **Weekly** |
| Monetization | **Free** | Subscription |
| Size | 3 MB | 191 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 17+ | 12+ |
| Developer | [Infinite Transparency](https://appshunter.io/developer/1751743572) | [Polywise, Inc.](https://appshunter.io/developer/1437286958) |

## What reviewers say

### Transparency Harm Reduction

[App page](https://appshunter.io/ios/app/transparency-harm-reduction/id6504291757)

This AI-powered app offers immediate guidance for substance testing, featuring a database of reaction videos and advice on kit usage. It aims to make substance testing accessible and easy with expert-backed information.

**Highlights:** AI-powered substance testing guidance, Database of over 1,100 lab-verified reaction videos, Instructions on how to test substances, Test kit recommendations, Access to testing guides and help, Direct links to purchase test kits

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

**In-app purchases:** none


### Fathom

[App page](https://appshunter.io/ios/app/fathom-learn-philosophy/id6742149252)

Explore great thinkers and philosophies with bite-sized lessons. Understand complex ideas with elegant visuals and build a daily habit of learning. Access over 50 learning paths on diverse philosophical topics.

**Highlights:** Daily philosophy habit building, Bite-sized lessons (under 2 minutes), Elegant visual explanations, 50+ learning paths, Save and review insights, Set learning goals

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

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Subscription | $6.99 | per month |
| Premium Monthly Subscription | $12.99 | per month |
| Yearly Subscription (no trial) | $49.99 | per year |
| Yearly Subscription | $49.99 | per year |
| Yearly Subscription (Premium) | $59.99 | per year |
| Yearly Access Premium No Trial | $59.99 | per year |
| Yearly Sub Premium No Trial | $69.99 | per year |
| Yearly Subscription Premium | $69.99 | per year |

**What reviewers like**

- 👍 Engaging and interactive lessons
- 🎨 Visually appealing and informative
- 🧠 Helps develop critical thinking skills
- 🔍 Broad range of philosophical topics covered

**What reviewers complain about**

- 💰 Subscription-based model with limited free trial
- 🤔 Some questions felt leading rather than open-ended
- 🕰️ Lack of flexibility to revisit initial philosopher selections

**Reported bugs**

- Unexpected charges during free trial period
- Potential issues with app functionality and compatibility

**Requested features**

- Option to customize or revisit philosopher selections
- More information about the app's algorithm and learning progression
- Ability to explore a wider range of philosophical perspectives


## Frequently asked questions

### Is Transparency Harm Reduction free?

Transparency Harm Reduction is free to download, with no in-app purchases.

### Is Fathom free?

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

### Which has better reviews, Transparency Harm Reduction or Fathom?

Fathom is rated higher. Transparency Harm Reduction averages 3.7 out of 5 from 6 ratings, while Fathom averages 4.8 from 508 ratings.

### Do Transparency Harm Reduction or Fathom have ads?

Fathom shows ads; Transparency Harm Reduction does not.

### Which is updated more often, Transparency Harm Reduction or Fathom?

Transparency Harm Reduction ships an update every 3 weeks, and Fathom weekly. Most recently, Transparency Harm Reduction was updated on November 4, 2026 and Fathom on October 30, 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.*