# Si4Keyboard vs SMIME Toolkit

The clearest difference is update cadence: SMIME Toolkit at weekly against Si4Keyboard's fortnightly. Si4Keyboard's advantage is price ($0.99 vs $2.99). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

Si4Keyboard costs $0.99 and SMIME Toolkit $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Si4Keyboard ships an update fortnightly, SMIME Toolkit weekly. The most recent releases landed on October 17, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Si4Keyboard | SMIME Toolkit |
| --- | --- | --- |
| Price | **$0.99** | $2.99 |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/smime-toolkit-smime-setup/id6758324323/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Fortnightly | **Weekly** |
| Monetization | — | Paid |
| Size | 14 MB | 3 MB |
| Requires iOS | 17.6 | **16.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [文焕 陈](https://appshunter.io/developer/1810161184) | [Seth Farrington18896201822](https://appshunter.io/developer/1803242963) |

## What reviewers say

### Si4Keyboard

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

**Features:** macOS Compatibility

**In-app purchases:** none


### SMIME Toolkit

[App page](https://appshunter.io/ios/app/smime-toolkit-smime-setup/id6758324323)

This app simplifies the process of setting up S/MIME for secure email on your iPhone and iPad. It guides you through generating keys, requesting certificates, and exporting your identity for manual installation in Apple Mail.

**Highlights:** On-device key generation, Standards-compliant CSR creation, Secure certificate requests, PKCS#12 (.p12) identity export, Face ID/Touch ID protection, Manual installation guidance

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

**In-app purchases:** none


## Frequently asked questions

### Is Si4Keyboard free?

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

### Is SMIME Toolkit free?

SMIME Toolkit costs $2.99, with no in-app purchases.

### Do Si4Keyboard or SMIME Toolkit have ads?

Neither Si4Keyboard nor SMIME Toolkit shows ads.

### Which is updated more often, Si4Keyboard or SMIME Toolkit?

Si4Keyboard ships an update fortnightly, and SMIME Toolkit weekly. Most recently, Si4Keyboard was updated on October 17, 2026 and SMIME Toolkit 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.*