# 상식 한 줄 vs Revocal

The clearest difference is in-app purchases: Revocal at none against 상식 한 줄's 2. Revocal also leads on update cadence (every 3 days vs every 2 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. 상식 한 줄 sells 2 in-app purchases, starting at $1.99 per month. Revocal asks for nothing beyond the download.

상식 한 줄 ships an update every 2 weeks, Revocal every 3 days. The most recent releases landed on November 3, 2026 and November 9, 2026 respectively.

## The numbers

| Metric | 상식 한 줄 | Revocal |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/id6451434808/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 80.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 3 days** |
| Monetization | Freemium | — |
| Size | 57 MB | 135 MB |
| Requires iOS | 16.4 | **15.5** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 12+ | 4+ |
| Developer | [Sunghee Lee](https://appshunter.io/developer/1477689060) | [Braindeck Inc.](https://appshunter.io/developer/6789487313) |

## What reviewers say

### 상식 한 줄

[App page](https://appshunter.io/ios/app/id6451434808)

Access a daily line of general knowledge on your home screen without dedicated study time. Explore over 3,000 facts across 60 topics, test your knowledge with quizzes, and track your learning progress through levels and streaks. Save and search for facts to build a consistent learning habit.

**Highlights:** Daily knowledge facts via widgets, Over 3,000 facts across 60 topics, 4-choice quizzes for review, Leveling and streak tracking, Save and search for facts, Home and lock screen widgets

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1개월 Premium | $1.99 | per month |
| 1년 Premium | $14.99 | per year |


### Revocal

[App page](https://appshunter.io/ios/app/revocal/id6757140652)

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

**In-app purchases:** none


## Frequently asked questions

### Is 상식 한 줄 free?

상식 한 줄 is free to download, with in-app purchases available.

### Is Revocal free?

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

### Do 상식 한 줄 or Revocal have ads?

Neither 상식 한 줄 nor Revocal shows ads.

### Which is updated more often, 상식 한 줄 or Revocal?

상식 한 줄 ships an update every 2 weeks, and Revocal every 3 days. Most recently, 상식 한 줄 was updated on November 3, 2026 and Revocal on November 9, 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.*