# Operational Amplifiers Guide vs 3DCraftNexus

The clearest difference is in-app purchases: Operational Amplifiers Guide at none against 3DCraftNexus's 7. 3DCraftNexus's advantage is ads (none vs shown) and update cadence (every 3 weeks vs every 2 months). On price, device support and iOS requirement there is nothing between them.

Both are free to download. 3DCraftNexus sells 7 one-off in-app purchases. Operational Amplifiers Guide asks for nothing beyond the download.

Operational Amplifiers Guide ships an update every 2 months, 3DCraftNexus every 3 weeks. The most recent releases landed on October 1, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Operational Amplifiers Guide | 3DCraftNexus |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 2 months | **Every 3 weeks** |
| Size | 17 MB | 59 MB |
| Requires iOS | 16.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [ALG Software Lab](https://appshunter.io/developer/1650561236) | [Youmina (Beijing) Technology Co., Ltd](https://appshunter.io/developer/1694321052) |

## What reviewers say

### Operational Amplifiers Guide

[App page](https://appshunter.io/ios/app/operational-amplifiers-guide/id6467499897)

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

**In-app purchases:** none


### 3DCraftNexus

[App page](https://appshunter.io/ios/app/3dcraftnexus/id6755817578)

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| image_to_25D_1K | $0.99 | one-time |
| image to 3D | $1.99 | one-time |
| image to 2.5D | $2.99 | one-time |
| images_to_2.5D_2K | $2.99 | one-time |
| benefit_card_25D_svip | $9.99 | one-time |
| image_to_25D_4K | $9.99 | one-time |
| SVIP 2.5D生图月度权益卡 | $44.99 | one-time |


## Frequently asked questions

### Is Operational Amplifiers Guide free?

Operational Amplifiers Guide is free to download, with no in-app purchases.

### Is 3DCraftNexus free?

3DCraftNexus is free to download, with in-app purchases available.

### Do Operational Amplifiers Guide or 3DCraftNexus have ads?

Operational Amplifiers Guide shows ads; 3DCraftNexus does not.

### Which is updated more often, Operational Amplifiers Guide or 3DCraftNexus?

Operational Amplifiers Guide ships an update every 2 months, and 3DCraftNexus every 3 weeks. Most recently, Operational Amplifiers Guide was updated on October 1, 2026 and 3DCraftNexus 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.*