# 틈틈잇 vs 산안기

The clearest difference is review sentiment: 틈틈잇 at 92% against 산안기's 0%. 틈틈잇 also leads on in-app purchases (none vs 3) and ads (none vs shown). 산안기's advantage is device support (3 vs 1) and iOS requirement (15.1 vs 18.0). On price there is nothing between them.

Both are free to download. 산안기 sells 3 in-app purchases, starting at $1.99 per month. 틈틈잇 asks for nothing beyond the download.

틈틈잇 ships an update weekly, 산안기 every 3 weeks. The most recent releases landed on October 10, 2026 and October 18, 2026 respectively.

## The numbers

| Metric | 틈틈잇 | 산안기 |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | **91.7% of reviews** | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Weekly** | Every 3 weeks |
| Monetization | **Free** | Free with in-app purchases |
| Size | 29 MB | 91 MB |
| Requires iOS | 18.0 | **15.1** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [JaeHyeon Lim](https://appshunter.io/developer/1680730749) | [dasong sim](https://appshunter.io/developer/1883683802) |

## What reviewers say

### 틈틈잇

[App page](https://appshunter.io/ios/app/ai/id6757255726)

Transform idle moments into productive learning with personalized AI-generated quizzes. Daily "knowledge snacks" are delivered to your home screen, offering a fun, 5-minute way to absorb and test new information. Stay motivated with smart reminders and visual progress tracking.

**Highlights:** AI-generated personalized quizzes, Daily "knowledge snacks" on home screen, 5-minute learning sessions, Smart reminders for learning routines, Visual progress tracking and rewards, Revisit completed quizzes

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

**In-app purchases:** none


### 산안기

[App page](https://appshunter.io/ios/app/id6765879972)

This app focuses on effective review and understanding of concepts for the Industrial Safety Engineer exam. It uses an AI-powered algorithm to schedule personalized reviews, identifies your weaknesses, and provides detailed explanations and practice tests. Study efficiently even with limited time.

**Highlights:** AI-powered spaced repetition for optimal review, Concept-based learning with detailed explanations, Personalized weakness analysis and targeted practice, Full-range practice tests simulating the actual exam, Built-in scientific calculator, Offline study support, Progress tracking and study reports

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 프리미엄 월간 | $1.99 | per month |
| 프리미엄 3개월 | $3.99 | per 3 months |
| 프리미엄 평생 | $5.99 | one-time |


## Frequently asked questions

### Is 틈틈잇 free?

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

### Is 산안기 free?

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

### Do 틈틈잇 or 산안기 have ads?

산안기 shows ads; 틈틈잇 does not.

### Which is updated more often, 틈틈잇 or 산안기?

틈틈잇 ships an update weekly, and 산안기 every 3 weeks. Most recently, 틈틈잇 was updated on October 10, 2026 and 산안기 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.*