# ONBU vs Flashcards 3D

The clearest difference is in-app purchases: ONBU at none against Flashcards 3D's 7. ONBU also leads on device support (3 vs 1) and iOS requirement (13.0 vs 18). Flashcards 3D's advantage is update cadence (every 6 days vs fortnightly). On price and ads there is nothing between them.

Both are free to download. Flashcards 3D sells 7 in-app purchases, starting at $5.99 per month. ONBU asks for nothing beyond the download.

ONBU ships an update fortnightly, Flashcards 3D every 6 days. The most recent releases landed on September 30, 2026 and October 18, 2026 respectively.

## The numbers

| Metric | ONBU | Flashcards 3D |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 6 days** |
| Size | 105 MB | 57 MB |
| Requires iOS | **13.0** | 18 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [DOTB SOFTWARE COMPANY LIMITED](https://appshunter.io/developer/1475488444) | [Nhut Huynh](https://appshunter.io/developer/6786500127) |

## What reviewers say

### ONBU

[App page](https://appshunter.io/ios/app/onbu/id6502806120)

**Features:** macOS Compatibility

**In-app purchases:** none


### Flashcards 3D

[App page](https://appshunter.io/ios/app/flashcards-3d/id6642654598)

**Features:** Family Sharing

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Flashy Monthly | $5.99 | per month |
| Monthly Package | $6.99 | per month |
| Flashy 3 Months | $12.99 | per 3 months |
| Flashy Yearly | $34.99 | per year |
| Yearly Package | $59.99 | per year |
| Daily Usage Reset | $1.99 | one-time |
| AI Boost Pack | $1.99 | one-time |


## Frequently asked questions

### Is ONBU free?

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

### Is Flashcards 3D free?

Flashcards 3D is free to download, with in-app purchases available.

### Do ONBU or Flashcards 3D have ads?

Neither ONBU nor Flashcards 3D shows ads.

### Which is updated more often, ONBU or Flashcards 3D?

ONBU ships an update fortnightly, and Flashcards 3D every 6 days. Most recently, ONBU was updated on September 30, 2026 and Flashcards 3D on October 18, 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.*