# Preface.ai vs Knight Mathematics

The clearest difference is update cadence: Preface.ai at every 3 weeks against Knight Mathematics's every 3 months. On price, ads, in-app purchases and device support there is nothing between them.

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

Preface.ai ships an update every 3 weeks, Knight Mathematics every 3 months. Both last shipped on October 30, 2026.

## The numbers

| Metric | Preface.ai | Knight Mathematics |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 3 months |
| Size | 64 MB | 13 MB |
| Requires iOS | **15.1** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Preface Coding](https://appshunter.io/developer/1567531648) | [Dreamware Limited](https://appshunter.io/developer/892413586) |

## What reviewers say

### Preface.ai

[App page](https://appshunter.io/ios/app/prefaceai/id6541761017)

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

**In-app purchases:** none


### Knight Mathematics

[App page](https://appshunter.io/ios/app/knight-mathematics/id6738960557)

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

**In-app purchases:** none


## Frequently asked questions

### Is Preface.ai free?

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

### Is Knight Mathematics free?

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

### Do Preface.ai or Knight Mathematics have ads?

Neither Preface.ai nor Knight Mathematics shows ads.

### Which is updated more often, Preface.ai or Knight Mathematics?

Preface.ai ships an update every 3 weeks, and Knight Mathematics every 3 months. Most recently, Preface.ai was updated on October 30, 2026 and Knight Mathematics on October 30, 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.*