# PsyTimer Stopwatch 2 vs Power Units Converter

The clearest difference is update cadence: PsyTimer Stopwatch 2 at weekly against Power Units Converter's every 44 months. Power Units Converter's advantage is price ($1.99 vs $4.99) and chart position (#193 vs unranked). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

PsyTimer Stopwatch 2 costs $4.99 and Power Units Converter $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

PsyTimer Stopwatch 2 ships an update weekly, Power Units Converter every 44 months. The most recent releases landed on September 24, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | PsyTimer Stopwatch 2 | Power Units Converter |
| --- | --- | --- |
| Price | $4.99 | **$1.99** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Weekly** | Every 44 months |
| Best chart rank | — | **#193** |
| Size | 6 MB | 0 MB |
| Requires iOS | **15.5** | 15.6 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Cognisoft ApS](https://appshunter.io/developer/355312035) | [Kei Suefuji](https://appshunter.io/developer/1388335881) |

## What reviewers say

### PsyTimer Stopwatch 2

[App page](https://appshunter.io/ios/app/psytimer-stopwatch-2/id1243082504)

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

**In-app purchases:** none


### Power Units Converter

[App page](https://appshunter.io/ios/app/power-units-converter/id1441186871)

**Currently charting:** #193 Top Paid · Utilities (US App Store)

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

**In-app purchases:** none


## Frequently asked questions

### Is PsyTimer Stopwatch 2 free?

PsyTimer Stopwatch 2 costs $4.99, with no in-app purchases.

### Is Power Units Converter free?

Power Units Converter costs $1.99, with no in-app purchases.

### Do PsyTimer Stopwatch 2 or Power Units Converter have ads?

Neither PsyTimer Stopwatch 2 nor Power Units Converter shows ads.

### Which is updated more often, PsyTimer Stopwatch 2 or Power Units Converter?

PsyTimer Stopwatch 2 ships an update weekly, and Power Units Converter every 44 months. Most recently, PsyTimer Stopwatch 2 was updated on September 24, 2026 and Power Units Converter on September 9, 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.*