# phase estimation algorithm vs Terminal Drill

The clearest difference is in-app purchases: phase estimation algorithm at none against Terminal Drill's 1. On price, update cadence, ads and device support there is nothing between them.

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

phase estimation algorithm ships an update monthly, Terminal Drill every 5 weeks. The most recent releases landed on September 15, 2026 and September 5, 2026 respectively.

## The numbers

| Metric | phase estimation algorithm | Terminal Drill |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Monthly** | Every 5 weeks |
| Size | 12 MB | 7 MB |
| Requires iOS | **16.0** | 17.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Sungjun Kim](https://appshunter.io/developer/1602461985) | [Richard Ziolkowski](https://appshunter.io/developer/1895455279) |

## What reviewers say

### phase estimation algorithm

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

**Features:** macOS Compatibility

**In-app purchases:** none


### Terminal Drill

[App page](https://appshunter.io/ios/app/terminal-drill/id6763718668)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Terminal Drill - Full Access | $3.99 | one-time |


## Frequently asked questions

### Is phase estimation algorithm free?

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

### Is Terminal Drill free?

Terminal Drill is free to download, with in-app purchases available.

### Do phase estimation algorithm or Terminal Drill have ads?

Neither phase estimation algorithm nor Terminal Drill shows ads.

### Which is updated more often, phase estimation algorithm or Terminal Drill?

phase estimation algorithm ships an update monthly, and Terminal Drill every 5 weeks. Most recently, phase estimation algorithm was updated on September 15, 2026 and Terminal Drill on September 5, 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.*