# OSSA App vs Deckbase

The clearest difference is in-app purchases: OSSA App at none against Deckbase's 7. OSSA App also leads on ads (none vs shown) and iOS requirement (15.1 vs 17.0). Deckbase's advantage is update cadence (weekly vs every 4 months). On price and device support there is nothing between them.

Both are free to download. Deckbase sells 7 in-app purchases, starting at $5.99 per month. OSSA App asks for nothing beyond the download.

OSSA App ships an update every 4 months, Deckbase weekly. The most recent releases landed on November 2, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | OSSA App | Deckbase |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 4 months | **Weekly** |
| Monetization | — | Free with in-app purchases |
| Size | 49 MB | 119 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 12+ | 4+ |
| Developer | [Purist Industries (PTY) LTD](https://appshunter.io/developer/1477331204) | [Yosuke Sakurai](https://appshunter.io/developer/1706591331) |

## What reviewers say

### OSSA App

[App page](https://appshunter.io/ios/app/ossa-app/id1450236721)

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

**In-app purchases:** none


### Deckbase

[App page](https://appshunter.io/ios/app/deckbase-ai-flashcard-maker/id6760248255)

Effortlessly create flashcards from PDFs, notes, or photos using AI. Study with spaced repetition, quizzes, and audio. Syncs across devices and supports Anki import/export.

**Highlights:** AI-generated flashcards from documents and photos, Spaced repetition study scheduler, Interactive quizzes, Audio playback for decks, Anki import and export, Cross-device syncing

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

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Basic Month | $5.99 | per month |
| Pro Month | $11.99 | per month |
| Basic Year | $59.00 | per year |
| Pro Year | $119.00 | per year |
| Starter Pack | $4.99 | one-time |
| Booster Pack | $9.99 | one-time |
| Mega Pack | $19.99 | one-time |


## Frequently asked questions

### Is OSSA App free?

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

### Is Deckbase free?

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

### Do OSSA App or Deckbase have ads?

Deckbase shows ads; OSSA App does not.

### Which is updated more often, OSSA App or Deckbase?

OSSA App ships an update every 4 months, and Deckbase weekly. Most recently, OSSA App was updated on November 2, 2026 and Deckbase on November 5, 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.*