# 在家画画HD vs Filter Calculator

The clearest difference is ads: 在家画画HD at none against Filter Calculator's shown. 在家画画HD also leads on update cadence (every 6 weeks vs every 5 months) and iOS requirement (8.0 vs 15.0). Filter Calculator's advantage is device support (3 vs 1). On price and in-app purchases there is nothing between them.

Both are free to download. 在家画画HD sells 3 one-off in-app purchases and Filter Calculator sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

在家画画HD ships an update every 6 weeks, Filter Calculator every 5 months. The most recent releases landed on October 9, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | 在家画画HD | Filter Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 6 weeks** | Every 5 months |
| Monetization | — | Free with in-app purchases |
| Size | 33 MB | 53 MB |
| Requires iOS | **8.0** | 15.0 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [北京绘本原创教育科技有限公司](https://appshunter.io/developer/963046355) | [Anas Abubakar](https://appshunter.io/developer/1581534101) |

## What reviewers say

### 在家画画HD

[App page](https://appshunter.io/ios/app/hd/id1118870574)

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 12绘画币 | $1.99 | one-time |
| 30绘画币 | $4.99 | one-time |
| 108绘画币 | $15.99 | one-time |


### Filter Calculator

[App page](https://appshunter.io/ios/app/filter-calculator-electronics/id6754560517)

Design various types of electronic filters, including RC, RL, RLC, and passive crossovers, with customizable orders and alignments. Instantly obtain component values and Bode insights for lab, classroom, or audio projects. Ideal for engineers, hobbyists, and students.

**Highlights:** Design RC, RL, and RLC filters (2nd-7th order), Butterworth & Chebyshev alignments, Passive crossover calculations, Twin-T notch filter design, Instant component values, Bode insights, Offline-friendly dark mode UI

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Upgrade to Pro | $2.99 | one-time |


## Frequently asked questions

### Is 在家画画HD free?

在家画画HD is free to download, with in-app purchases available.

### Is Filter Calculator free?

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

### Do 在家画画HD or Filter Calculator have ads?

Filter Calculator shows ads; 在家画画HD does not.

### Which is updated more often, 在家画画HD or Filter Calculator?

在家画画HD ships an update every 6 weeks, and Filter Calculator every 5 months. Most recently, 在家画画HD was updated on October 9, 2026 and Filter Calculator on October 13, 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.*