# 先生 vs PROTOCOL

The clearest difference is in-app purchases: 先生 at none against PROTOCOL's 10. 先生 also leads on ads (none vs shown) and iOS requirement (6.0 vs 15.0). PROTOCOL's advantage is update cadence (every 3 days vs every 43 months). On price and device support there is nothing between them.

Both are free to download. PROTOCOL sells 10 one-off in-app purchases. 先生 asks for nothing beyond the download.

先生 ships an update every 43 months, PROTOCOL every 3 days. The most recent releases landed on October 24, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | 先生 | PROTOCOL |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 90.9% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 43 months | **Every 3 days** |
| Size | 23 MB | 259 MB |
| Requires iOS | **6.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 9+ | 9+ |
| Developer | [m7kenji](https://appshunter.io/developer/423804891) | [SungGwon Han](https://appshunter.io/developer/1117887913) |

## What reviewers say

### 先生

[App page](https://appshunter.io/ios/app/id853166104)

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

**In-app purchases:** none


### PROTOCOL

[App page](https://appshunter.io/ios/app/protocol-zero-rift/id6740158945)

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

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Beginner Package 1 | $0.99 | one-time |
| Sale Package 3 | $1.99 | one-time |
| Sale Package 1 | $2.99 | one-time |
| Sale Package 2 | $4.99 | one-time |
| Beginner Package 2 | $4.99 | one-time |
| Remove Ad | $5.99 | one-time |
| Daily Special Mission Ticket | $7.99 | one-time |
| Mission Energy Booster (30 Days) | $9.99 | one-time |
| Stage Pass | $9.99 | one-time |
| Beginner Package 3 | $14.99 | one-time |


## Frequently asked questions

### Is 先生 free?

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

### Is PROTOCOL free?

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

### Do 先生 or PROTOCOL have ads?

PROTOCOL shows ads; 先生 does not.

### Which is updated more often, 先生 or PROTOCOL?

先生 ships an update every 43 months, and PROTOCOL every 3 days. Most recently, 先生 was updated on October 24, 2026 and PROTOCOL on October 30, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*