# PP+ Simple Harmonic Motion vs GRADED+ Student Work Scanner

The clearest difference is review sentiment: GRADED+ Student Work Scanner at 67% against PP+ Simple Harmonic Motion's 0%. GRADED+ Student Work Scanner also leads on price (Free vs $1.99) and update cadence (every 6 days vs every 29 months). PP+ Simple Harmonic Motion's advantage is ads (none vs shown). On in-app purchases there is nothing between them.

GRADED+ Student Work Scanner is free to download; PP+ Simple Harmonic Motion costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

PP+ Simple Harmonic Motion ships an update every 29 months, GRADED+ Student Work Scanner every 6 days. The most recent releases landed on June 8, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | PP+ Simple Harmonic Motion | GRADED+ Student Work Scanner |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | — | **[5.0 (7 ratings)](https://appshunter.io/ios/app/graded-plus-student-work-scanner/id1641870509/reviews)** |
| Number of ratings | — | **7** |
| Positive reviews | 0.0% of reviews | **66.7% of reviews** |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 29 months | **Every 6 days** |
| Monetization | Paid | **Ad-supported** |
| Size | 115 MB | 78 MB |
| Requires iOS | 18.0 | **12.0** |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Polyhedron Learning Media, Inc.](https://appshunter.io/developer/458882328) | [Solved Education Consultancy, LLC](https://appshunter.io/developer/1506645558) |

## 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


### GRADED+ Student Work Scanner

[App page](https://appshunter.io/ios/app/graded-plus-student-work-scanner/id1641870509)

This app helps teachers create and analyze single-question formative assessments focused on problem-solving and short-response writing. It allows for easy scanning of student work via phone camera, with results automatically saved to Google Drive and Classroom for progress tracking.

**Highlights:** Single-item formative assessments, Scan student work with phone camera, Auto-save to Google Drive/Classroom, Standards-based gradebook, Digital student work portfolio, Exit ticket analysis

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is PP+ Simple Harmonic Motion free?

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

### Is GRADED+ Student Work Scanner free?

GRADED+ Student Work Scanner is free to download, with no in-app purchases.

### Do PP+ Simple Harmonic Motion or GRADED+ Student Work Scanner have ads?

GRADED+ Student Work Scanner shows ads; PP+ Simple Harmonic Motion does not.

### Which is updated more often, PP+ Simple Harmonic Motion or GRADED+ Student Work Scanner?

PP+ Simple Harmonic Motion ships an update every 29 months, and GRADED+ Student Work Scanner every 6 days. Most recently, PP+ Simple Harmonic Motion was updated on June 8, 2026 and GRADED+ Student Work Scanner on September 24, 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.*