# OTP Conductor vs Si4Keyboard

The clearest difference is price: OTP Conductor at Free against Si4Keyboard's $0.99. On update cadence, ads, in-app purchases and device support there is nothing between them.

OTP Conductor is free to download; Si4Keyboard costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

OTP Conductor ships an update every 9 days, Si4Keyboard fortnightly. The most recent releases landed on October 29, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | OTP Conductor | Si4Keyboard |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 9 days** | Fortnightly |
| Size | 2 MB | 14 MB |
| Requires iOS | **16.0** | 17.6 |
| Devices | **iPhone, iPad, Apple Watch** | iPhone, iPad |
| Age rating | 4+ | 17+ |
| Developer | [Wenhuan Li](https://appshunter.io/developer/1243152342) | [文焕 陈](https://appshunter.io/developer/1810161184) |

## What reviewers say

### OTP Conductor

[App page](https://appshunter.io/ios/app/otp-conductor/id1404947090)

**Features:** Apple Watch app, Vision Pro support

**In-app purchases:** none


### Si4Keyboard

[App page](https://appshunter.io/ios/app/si4keyboard/id6745263713)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is OTP Conductor free?

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

### Is Si4Keyboard free?

Si4Keyboard costs $0.99, with no in-app purchases.

### Do OTP Conductor or Si4Keyboard have ads?

Neither OTP Conductor nor Si4Keyboard shows ads.

### Which is updated more often, OTP Conductor or Si4Keyboard?

OTP Conductor ships an update every 9 days, and Si4Keyboard fortnightly. Most recently, OTP Conductor was updated on October 29, 2026 and Si4Keyboard on October 25, 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.*