# Spider Identifier | Bug Finder vs Quantum Mechanics Notes

The clearest difference is iOS requirement: Spider Identifier | Bug Finder at 15.0 against Quantum Mechanics Notes's 17.0. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Spider Identifier | Bug Finder sells 2 in-app purchases, starting at $39.99 per year and Quantum Mechanics Notes sells 4 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | Spider Identifier | Bug Finder | Quantum Mechanics Notes |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | — | Daily |
| Size | 65 MB | 32 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [DIDEM URAS](https://appshunter.io/developer/1896691187) | [际 郭](https://appshunter.io/developer/6797282134) |

## What reviewers say

### Spider Identifier | Bug Finder

[App page](https://appshunter.io/ios/app/spider-identifier-bug-finder/id6781483413)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Yearly Plan | $39.99 | per year |
| Lifetime Plan | $79.99 | one-time |


### Quantum Mechanics Notes

[App page](https://appshunter.io/ios/app/quantum-mechanics-notes/id6808079339)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 支持作者 ¥6 | $0.99 | one-time |
| 支持作者 ¥1 | $0.99 | one-time |
| 支持作者 ¥8 | $0.99 | one-time |
| 支持作者 ¥28 | $3.99 | one-time |


## Frequently asked questions

### Is Spider Identifier | Bug Finder free?

Spider Identifier | Bug Finder is free to download, with in-app purchases available.

### Is Quantum Mechanics Notes free?

Quantum Mechanics Notes is free to download, with in-app purchases available.

### Do Spider Identifier | Bug Finder or Quantum Mechanics Notes have ads?

Neither Spider Identifier | Bug Finder nor Quantum Mechanics Notes shows ads.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*