# O vs Zen SmartLearn

O and Zen SmartLearn 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. Neither carries in-app purchases, so what you see is what you pay.

O ships an update every 5 months, Zen SmartLearn every 8 months. Both last shipped on September 17, 2026.

## The numbers

| Metric | O | Zen SmartLearn |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 months** | Every 8 months |
| Size | 9 MB | 138 MB |
| Requires iOS | **12.1** | 13.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [teerapat supamitsatian](https://appshunter.io/developer/1504648563) | [CONICLE COMPANY LIMITED](https://appshunter.io/developer/979282578) |

## What reviewers say

### O

[App page](https://appshunter.io/ios/app/o-plus-online/id1504677992)

**Features:** macOS Compatibility

**In-app purchases:** none


### Zen SmartLearn

[App page](https://appshunter.io/ios/app/zen-smartlearn/id1560077496)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is O free?

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

### Is Zen SmartLearn free?

Zen SmartLearn is free to download, with no in-app purchases.

### Do O or Zen SmartLearn have ads?

Neither O nor Zen SmartLearn shows ads.

### Which is updated more often, O or Zen SmartLearn?

O ships an update every 5 months, and Zen SmartLearn every 8 months. Most recently, O was updated on September 17, 2026 and Zen SmartLearn on September 17, 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.*