# PP+ Simple Harmonic Motion vs AP Physics C, 2e

The clearest difference is price: AP Physics C, 2e at Free against PP+ Simple Harmonic Motion's $1.99. AP Physics C, 2e also leads on update cadence (every 7 months vs every 29 months) and device support (3 vs 1). PP+ Simple Harmonic Motion's advantage is in-app purchases (none vs 5). On ads there is nothing between them.

AP Physics C, 2e is free to download; PP+ Simple Harmonic Motion costs $1.99 up front. AP Physics C, 2e sells 5 in-app purchases, starting at $5.99 per 7 days. PP+ Simple Harmonic Motion asks for nothing beyond the download.

PP+ Simple Harmonic Motion ships an update every 29 months, AP Physics C, 2e every 7 months. The most recent releases landed on June 8, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | PP+ Simple Harmonic Motion | AP Physics C, 2e |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 29 months | **Every 7 months** |
| Monetization | Paid | — |
| Size | 115 MB | 57 MB |
| Requires iOS | 18.0 | **15.6** |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Polyhedron Learning Media, Inc.](https://appshunter.io/developer/458882328) | [Expanded Apps](https://appshunter.io/developer/313709778) |

## What reviewers say

### PP+ Simple Harmonic Motion

[App page](https://appshunter.io/ios/app/pp-plus-simple-harmonic-motion/id599165859)

Explore the principles of simple harmonic motion with a virtual spring-mass system. This educational tool provides realistic 3D simulations, data analysis tools, and comprehensive learning materials for students.

**Highlights:** 3D spring-mass simulation, Realistic data with errors, Data analysis and reporting tools, Introductory videos and background theory, Pre-lab quiz and post-lab questions, Teacher support materials

**Features:** macOS Compatibility

**In-app purchases:** none


### AP Physics C, 2e

[App page](https://appshunter.io/ios/app/ap-physics-c-2e-test-prep/id1578353209)

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 Week | $5.99 | per 7 days |
| 1 Week | $6.99 | per 7 days |
| 1 Month | $17.99 | per month |
| 1 Year | $69.99 | per year |
| AP Physics C, 2e - Test Prep | $15.99 | one-time |


## Frequently asked questions

### Is PP+ Simple Harmonic Motion free?

PP+ Simple Harmonic Motion costs $1.99, with no in-app purchases.

### Is AP Physics C, 2e free?

AP Physics C, 2e is free to download, with in-app purchases available.

### Do PP+ Simple Harmonic Motion or AP Physics C, 2e have ads?

Neither PP+ Simple Harmonic Motion nor AP Physics C, 2e shows ads.

### Which is updated more often, PP+ Simple Harmonic Motion or AP Physics C, 2e?

PP+ Simple Harmonic Motion ships an update every 29 months, and AP Physics C, 2e every 7 months. Most recently, PP+ Simple Harmonic Motion was updated on June 8, 2026 and AP Physics C, 2e on September 17, 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.*