# phase estimation algorithm vs Physics Constants Library

The clearest difference is in-app purchases: phase estimation algorithm at none against Physics Constants Library's 1. phase estimation algorithm also leads on ads (none vs shown) and update cadence (monthly vs every 7 months). On price and device support there is nothing between them.

Both are free to download. Physics Constants Library sells 1 one-off in-app purchase. phase estimation algorithm asks for nothing beyond the download.

phase estimation algorithm ships an update monthly, Physics Constants Library every 7 months. The most recent releases landed on September 15, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | phase estimation algorithm | Physics Constants Library |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Monthly** | Every 7 months |
| Size | 12 MB | 10 MB |
| Requires iOS | **16.0** | 18.4 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Sungjun Kim](https://appshunter.io/developer/1602461985) | [ChatStick Company Limited](https://appshunter.io/developer/1165816085) |

## What reviewers say

### phase estimation algorithm

[App page](https://appshunter.io/ios/app/phase-estimation-algorithm/id6469448415)

**Features:** macOS Compatibility

**In-app purchases:** none


### Physics Constants Library

[App page](https://appshunter.io/ios/app/physics-constants-library/id6751224343)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock All Features | $2.99 | one-time |


## Frequently asked questions

### Is phase estimation algorithm free?

phase estimation algorithm is free to download, with no in-app purchases.

### Is Physics Constants Library free?

Physics Constants Library is free to download, with in-app purchases available.

### Do phase estimation algorithm or Physics Constants Library have ads?

Physics Constants Library shows ads; phase estimation algorithm does not.

### Which is updated more often, phase estimation algorithm or Physics Constants Library?

phase estimation algorithm ships an update monthly, and Physics Constants Library every 7 months. Most recently, phase estimation algorithm was updated on September 15, 2026 and Physics Constants Library on September 20, 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.*