# Prime Arch Int. vs Schema

The clearest difference is in-app purchases: Prime Arch Int. at none against Schema's 2. Prime Arch Int. also leads on device support (3 vs 1) and iOS requirement (15.0 vs 18.0). Schema's advantage is ads (none vs shown) and update cadence (every 9 days vs every 4 months). On price there is nothing between them.

Both are free to download. Schema sells 2 in-app purchases, starting at $14.99 per month. Prime Arch Int. asks for nothing beyond the download.

Prime Arch Int. ships an update every 4 months, Schema every 9 days. The most recent releases landed on September 15, 2026 and September 7, 2026 respectively.

## The numbers

| Metric | Prime Arch Int. | Schema |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/schema-knowledge-compounding/id6747011799/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 4 months | **Every 9 days** |
| Monetization | — | Freemium |
| Size | 54 MB | 165 MB |
| Requires iOS | **15.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 17+ | 4+ |
| Developer | [aRway AB](https://appshunter.io/developer/1421779695) | [Infinity Labs AG](https://appshunter.io/developer/1818442467) |

## What reviewers say

### Prime Arch Int.

[App page](https://appshunter.io/ios/app/prime-arch-int/id1492454234)

**Features:** macOS Compatibility

**In-app purchases:** none


### Schema

[App page](https://appshunter.io/ios/app/schema-knowledge-compounding/id6747011799)

This AI-powered learning companion helps you capture, summarize, and retain important ideas. It uses smart review intervals to ensure knowledge sticks, fostering deeper understanding for lifelong learners. Turn consumed information into lasting comprehension.

**Highlights:** Capture and organize key ideas, AI summarization, Spaced repetition reviews, Smart practice for retention, Build compounding mental leverage

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Schema Pro Monthly | $14.99 | per month |
| Schema Pro Yearly | $149.99 | per year |


## Frequently asked questions

### Is Prime Arch Int. free?

Prime Arch Int. is free to download, with no in-app purchases.

### Is Schema free?

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

### Do Prime Arch Int. or Schema have ads?

Prime Arch Int. shows ads; Schema does not.

### Which is updated more often, Prime Arch Int. or Schema?

Prime Arch Int. ships an update every 4 months, and Schema every 9 days. Most recently, Prime Arch Int. was updated on September 15, 2026 and Schema on September 7, 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.*