# The Syntopi.com vs Underscore

The clearest difference is in-app purchases: The Syntopi.com at none against Underscore's 3. The Syntopi.com also leads on update cadence (every 3 weeks vs every 2 months). Underscore's advantage is ads (none vs shown). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Underscore sells 3 in-app purchases, starting at $4.99 per month. The Syntopi.com asks for nothing beyond the download.

The Syntopi.com ships an update every 3 weeks, Underscore every 2 months. The most recent releases landed on November 5, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | The Syntopi.com | Underscore |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/the-syntopicom/id6764733944/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 3 weeks** | Every 2 months |
| Monetization | Ad-supported | — |
| Size | 13 MB | 15 MB |
| Requires iOS | **17.0** | 18.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 12+ |
| Developer | [THOMAS ROBERT COHEN](https://appshunter.io/developer/1895897476) | [GOEKHAN IBRIKCI](https://appshunter.io/developer/6797988137) |

## What reviewers say

### The Syntopi.com

[App page](https://appshunter.io/ios/app/the-syntopicom/id6764733944)

Access a free liberal arts education with digital versions of Great Books. Explore ideas, authors, and thinkers through interactive visualizations and AI-powered tutors. Listen to narrated passages, generate quizzes, and compare arguments.

**Highlights:** AI-powered tutors, 3D Galaxy of Ideas visualization, Side-by-side thinker argument comparison, Audio narration and offline playback, Auto-generated quizzes, Curated reading paths

**Features:** macOS Compatibility

**In-app purchases:** none


### Underscore

[App page](https://appshunter.io/ios/app/underscore-one-line-a-day/id6797988135)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Plus Monthly | $4.99 | per month |
| Plus Yearly | $24.99 | per year |
| Plus Lifetime | $59.99 | one-time |


## Frequently asked questions

### Is The Syntopi.com free?

The Syntopi.com is free to download, with no in-app purchases.

### Is Underscore free?

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

### Do The Syntopi.com or Underscore have ads?

The Syntopi.com shows ads; Underscore does not.

### Which is updated more often, The Syntopi.com or Underscore?

The Syntopi.com ships an update every 3 weeks, and Underscore every 2 months. Most recently, The Syntopi.com was updated on November 5, 2026 and Underscore 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.*