# Fish Identifier vs Quantum Mechanics Notes

Fish Identifier and Quantum Mechanics Notes are too close to call on the numbers: across 5 compared parameters — price, ads, in-app purchases and device support among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. Fish Identifier sells 3 in-app purchases, starting at $4.99 per 7 days 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 | Fish Identifier | Quantum Mechanics Notes |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | — | Daily |
| Size | 10 MB | 32 MB |
| Requires iOS | **16.0** | 17.0 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [LEAN ASIA CO., LTD](https://appshunter.io/developer/1815050814) | [际 郭](https://appshunter.io/developer/6797282134) |

## What reviewers say

### Fish Identifier

[App page](https://appshunter.io/ios/app/fish-identifier-photo-id-app/id6763857764)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Marine Scanner Weekly | $4.99 | per 7 days |
| Angler Journal Yearly | $24.99 | per year |
| Saltwater Fishing Lifetime | $49.99 | 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 Fish Identifier free?

Fish Identifier 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 Fish Identifier or Quantum Mechanics Notes have ads?

Neither Fish Identifier 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.*