# Online A Big vs DifferSheet

Online A Big and DifferSheet are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. Online A Big sells 5 one-off in-app purchases and DifferSheet sells 9 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Online A Big ships an update every 4 weeks, DifferSheet every 5 weeks. The most recent releases landed on September 30, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Online A Big | DifferSheet |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 4 weeks** | Every 5 weeks |
| Size | 31 MB | 37 MB |
| Requires iOS | 15.1 | **14.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [COURSE SQUARE COMPANY LIMITED](https://appshunter.io/developer/1131668582) | [Thakornkrid Thanatharapokin](https://appshunter.io/developer/1622203193) |

## 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 |


### DifferSheet

[App page](https://appshunter.io/ios/app/differsheet/id1633300617)

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

**In-app purchases (9)**

| Purchase | Price | Billing |
| --- | --- | --- |
| สตาร์เจม 30 ดวง | $0.99 | one-time |
| สตาร์เจม 95 ดวง | $2.99 | one-time |
| Stargem 230 ดวง | $5.99 | one-time |
| สตาร์เจม 539 ดวง | $12.99 | one-time |
| สตาร์เจม 689 ดวง | $16.99 | one-time |
| สตาร์เจม 779 ดวง | $18.99 | one-time |
| สตาร์เจม 1049 ดวง | $24.99 | one-time |
| สตาร์เจม 919 ดวง | $24.99 | one-time |
| stargem_1299 | $26.99 | one-time |


## Frequently asked questions

### Is Online A Big free?

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

### Is DifferSheet free?

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

### Do Online A Big or DifferSheet have ads?

Neither Online A Big nor DifferSheet shows ads.

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

Online A Big ships an update every 4 weeks, and DifferSheet every 5 weeks. Most recently, Online A Big was updated on September 30, 2026 and DifferSheet on October 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.*