# AtomC vs PaperBrain AI

The clearest difference is iOS requirement: AtomC at 15.1 against PaperBrain AI's 17.6. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. AtomC sells 8 in-app purchases, starting at $29.99 per month and PaperBrain AI sells 3 in-app purchases, starting at $7.99 per month. Whichever you choose, the download price is not the number that matters.

AtomC ships an update every 10 days, PaperBrain AI every 2 weeks. The most recent releases landed on October 18, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | AtomC | PaperBrain AI |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 10 days** | Every 2 weeks |
| Size | 43 MB | 27 MB |
| Requires iOS | **15.1** | 17.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Age rating | 12+ | 17+ |
| Developer | [Brandon Moore](https://appshunter.io/developer/1057050766) | [Bowen Craft](https://appshunter.io/developer/900161450) |

## What reviewers say

### AtomC

[App page](https://appshunter.io/ios/app/atomc/id6757501330)

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $29.99 | per month |
| Max Monthly | $79.99 | per month |
| Pro Yearly | $299.99 | per year |
| Max Yealy | $799.99 | per year |
| Starter Credit Pack | $9.99 | one-time |
| Growth Credit Pack | $45.00 | one-time |
| Business Credit Pack | $120.99 | one-time |
| Enterprise Credit Pack | $350.00 | one-time |


### PaperBrain AI

[App page](https://appshunter.io/ios/app/paperbrain-ai/id6771600487)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PaperBrain Standard Monthly | $7.99 | per month |
| PaperBrain Pro Monthly | $9.99 | per month |
| PaperBrain Max Monthly | $19.99 | per month |


## Frequently asked questions

### Is AtomC free?

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

### Is PaperBrain AI free?

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

### Do AtomC or PaperBrain AI have ads?

Neither AtomC nor PaperBrain AI shows ads.

### Which is updated more often, AtomC or PaperBrain AI?

AtomC ships an update every 10 days, and PaperBrain AI every 2 weeks. Most recently, AtomC was updated on October 18, 2026 and PaperBrain AI on October 14, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*