# 纯K训练助手 vs FormulaPad

The clearest difference is ads: FormulaPad at none against 纯K训练助手's shown. 纯K训练助手's advantage is update cadence (every 3 days vs every 2 months). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. 纯K训练助手 sells 2 one-off in-app purchases and FormulaPad sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

纯K训练助手 ships an update every 3 days, FormulaPad every 2 months. Both last shipped on October 31, 2026.

## The numbers

| Metric | 纯K训练助手 | FormulaPad |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 3 days** | Every 2 months |
| Monetization | — | Free with in-app purchases |
| Size | 7 MB | 3 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [忠杲 王](https://appshunter.io/developer/1896211214) | [小倩 徐](https://appshunter.io/developer/6771586178) |

## What reviewers say

### 纯K训练助手

[App page](https://appshunter.io/ios/app/k/id6766147411)

**Features:** macOS Compatibility, iPhone Duo support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 周会员 | $0.99 | one-time |
| 月度会员 | $2.99 | one-time |


### FormulaPad

[App page](https://appshunter.io/ios/app/formulapad/id6785820497)

A local-first math notebook calculator for iPhone. Type natural formulas, reuse variables, and save calculations as notes. Includes practical templates and unit conversions for everyday math needs.

**Highlights:** Natural formula input, Variable reuse, Calculation history, Math notes, Practical templates, Unit conversion, Function plotting

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| FormulaPad Pro | $0.99 | one-time |


## Frequently asked questions

### Is 纯K训练助手 free?

纯K训练助手 is free to download, with in-app purchases available.

### Is FormulaPad free?

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

### Do 纯K训练助手 or FormulaPad have ads?

纯K训练助手 shows ads; FormulaPad does not.

### Which is updated more often, 纯K训练助手 or FormulaPad?

纯K训练助手 ships an update every 3 days, and FormulaPad every 2 months. Most recently, 纯K训练助手 was updated on October 31, 2026 and FormulaPad on October 31, 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.*