# 나크21 vs 바이로그인

The clearest difference is review sentiment: 나크21 at 67% against 바이로그인's 0%. 바이로그인's advantage is iOS requirement (10.0 vs 12.0). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Both ship on a similar rhythm, roughly every 3 months. The most recent releases landed on November 1, 2026 and November 11, 2026 respectively.

## The numbers

| Metric | 나크21 | 바이로그인 |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | **66.7% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | Every 3 months |
| Monetization | Free | Free |
| Size | 16 MB | 21 MB |
| Requires iOS | 12.0 | **10.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [N.K CO.,Ltd](https://appshunter.io/developer/1495613793) | [Lylon. co. ltd](https://appshunter.io/developer/1509370027) |

## What reviewers say

### 나크21

[App page](https://appshunter.io/ios/app/21-nak21/id1027691542)

Receive real-time sale and event notifications, enjoy easy login, and invite friends for rewards. Track your deliveries with a single tap and easily write reviews for purchased items.

**Highlights:** Real-time push notifications for sales and events, Simplified login and easy member registration, Friend invitation system with rewards, One-touch delivery status tracking, Convenient auto-generated review prompts

**Features:** macOS Compatibility

**In-app purchases:** none


### 바이로그인

[App page](https://appshunter.io/ios/app/bylogin/id1089419668)

Receive real-time notifications for sales and events. Enjoy a simplified login process and easy access to benefits. Invite friends for rewards and track your deliveries with a single tap. Write reviews effortlessly for purchased items.

**Highlights:** Real-time push notifications for sales and events, Simplified login and member registration, Friend invitation system with rewards, One-touch delivery tracking, Easy review writing for purchased items

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is 나크21 free?

나크21 is free to download, with no in-app purchases.

### Is 바이로그인 free?

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

### Do 나크21 or 바이로그인 have ads?

Neither 나크21 nor 바이로그인 shows ads.

### Which is updated more often, 나크21 or 바이로그인?

나크21 ships an update every 3 months, and 바이로그인 every 3 months. Most recently, 나크21 was updated on November 1, 2026 and 바이로그인 on November 11, 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.*