# DR.Osci.HD vs Pendulum Lab

The clearest difference is price: DR.Osci.HD at Free against Pendulum Lab's $0.99. DR.Osci.HD also leads on in-app purchases (none vs 1) and iOS requirement (9.1 vs 15.0). Pendulum Lab's advantage is update cadence (every 5 weeks vs every 12 months). On ads and device support there is nothing between them.

DR.Osci.HD is free to download; Pendulum Lab costs $0.99 up front. Pendulum Lab sells 1 one-off in-app purchase. DR.Osci.HD asks for nothing beyond the download.

DR.Osci.HD ships an update every 12 months, Pendulum Lab every 5 weeks. The most recent releases landed on October 1, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | DR.Osci.HD | Pendulum Lab |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 12 months | **Every 5 weeks** |
| Monetization | Free | — |
| Size | 2 MB | 4 MB |
| Requires iOS | **9.1** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Daniel Roth](https://appshunter.io/developer/356650850) | [hyeonsu jeong](https://appshunter.io/developer/1628268684) |

## What reviewers say

### DR.Osci.HD

[App page](https://appshunter.io/ios/app/droscihd/id1003071526)

Explore physics concepts with a spring pendulum simulation. Manipulate parameters like damping, spring flexibility, and mass to observe oscillations. Record and export displacement graphs for deeper analysis.

**Highlights:** Spring pendulum simulation, Adjustable damping, spring flexibility, and mass, Gravity simulation, Record displacement over time, Export graphs to photo library

**Features:** macOS Compatibility

**In-app purchases:** none


### Pendulum Lab

[App page](https://appshunter.io/ios/app/pendulum-lab/id6661026555)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Triple Pendulum Unlock | $0.99 | one-time |


## Frequently asked questions

### Is DR.Osci.HD free?

DR.Osci.HD is free to download, with no in-app purchases.

### Is Pendulum Lab free?

Pendulum Lab costs $0.99, and also offers in-app purchases.

### Do DR.Osci.HD or Pendulum Lab have ads?

Neither DR.Osci.HD nor Pendulum Lab shows ads.

### Which is updated more often, DR.Osci.HD or Pendulum Lab?

DR.Osci.HD ships an update every 12 months, and Pendulum Lab every 5 weeks. Most recently, DR.Osci.HD was updated on October 1, 2026 and Pendulum Lab on October 4, 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.*