# Online A Big vs ARSA PREVIEW

The clearest difference is in-app purchases: ARSA PREVIEW at none against Online A Big's 8. ARSA PREVIEW also leads on update cadence (every 3 days vs every 4 weeks) and iOS requirement (12.0 vs 15.1). On price, ads and device support there is nothing between them.

Both are free to download. Online A Big sells 5 one-off in-app purchases. ARSA PREVIEW asks for nothing beyond the download.

Online A Big ships an update every 4 weeks, ARSA PREVIEW every 3 days. The most recent releases landed on October 25, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | Online A Big | ARSA PREVIEW |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/arsa-preview/id6505142392/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 4 weeks | **Every 3 days** |
| Monetization | — | Free |
| Size | 31 MB | 30 MB |
| Requires iOS | 15.1 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [COURSE SQUARE COMPANY LIMITED](https://appshunter.io/developer/1131668582) | [Arsa Tangchitsomkit](https://appshunter.io/developer/908885655) |

## What reviewers say

### Online A Big

[App page](https://appshunter.io/ios/app/online-a-big/id1493494981)

**Features:** macOS Compatibility

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ตะลุยโจทย์เคมี 9 วิชาสามัญ | $84.99 | one-time |
| ตะลุยโจทย์เคมี PAT2 | $84.99 | one-time |
| ตะลุยโจทย์เคมี 9 วิชาสามัญ | $89.99 | one-time |
| Org. Chem 1 เคมีมหาวิทยาลัย | $199.99 | one-time |
| Org. Chem 2 เคมีมหาวิทยาลัย | $199.99 | one-time |


### ARSA PREVIEW

[App page](https://appshunter.io/ios/app/arsa-preview/id6505142392)

This app allows artists, developers, and designers to preview PSD files directly on their mobile devices. Simply export your PSD from a compatible program and share it to see your design results immediately.

**Highlights:** Direct PSD file preview on mobile, Seamless file sharing from other apps, Immediate design result visualization, Supports exported PSD assets

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Online A Big free?

Online A Big is free to download, with in-app purchases available.

### Is ARSA PREVIEW free?

ARSA PREVIEW is free to download, with no in-app purchases.

### Do Online A Big or ARSA PREVIEW have ads?

Neither Online A Big nor ARSA PREVIEW shows ads.

### Which is updated more often, Online A Big or ARSA PREVIEW?

Online A Big ships an update every 4 weeks, and ARSA PREVIEW every 3 days. Most recently, Online A Big was updated on October 25, 2026 and ARSA PREVIEW on October 27, 2026.

---

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