# Stress Concentration Factors 2 vs Physics AI

The clearest difference is price: Physics AI at Free against Stress Concentration Factors 2's $5.99. Physics AI also leads on rating (4.5 vs 3.0) and update cadence (fortnightly vs every 38 months). Stress Concentration Factors 2's advantage is in-app purchases (none vs 2) and ads (none vs shown). On device support there is nothing between them.

Physics AI is free to download; Stress Concentration Factors 2 costs $5.99 up front. Physics AI sells 2 in-app purchases, starting at $5.99 per 7 days. Stress Concentration Factors 2 asks for nothing beyond the download.

Physics AI holds the better App Store score, 4.5 against 3.0. That said, the two scores are not equally well evidenced: Physics AI has 289 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 0% of Stress Concentration Factors 2's written reviews are positive against 25% of Physics AI's.

Stress Concentration Factors 2 ships an update every 38 months, Physics AI fortnightly. The most recent releases landed on November 3, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Stress Concentration Factors 2 | Physics AI |
| --- | --- | --- |
| Price | $5.99 | **Free** |
| Rating | [3.0 (1 ratings)](https://appshunter.io/ios/app/stress-concentration-factors-2/id1296693579/reviews) | **[4.5 (289 ratings)](https://appshunter.io/ios/app/physics-ai-problem-solver/id6474350204/reviews)** |
| Number of ratings | 1 | **289** |
| Positive reviews | 0.0% of reviews | **25.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 38 months | **Fortnightly** |
| Monetization | **Paid** | Subscription |
| Size | 11 MB | 16 MB |
| Requires iOS | **12.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [J.R.Hobbs](https://appshunter.io/developer/395110523) | [Renaissance Apps LLC](https://appshunter.io/developer/1220536592) |

## What reviewers say

### Stress Concentration Factors 2

[App page](https://appshunter.io/ios/app/stress-concentration-factors-2/id1296693579)

This application calculates stress concentration factors for various geometric discontinuities in engineering. It provides nominal and peak stress values, displays relevant equations, and allows users to easily share results via email or print them.

**Highlights:** Calculates Stress Concentration Factor, Metric and English Units, Nominal and Peak Stress Calculation, Displays Equations, Email/Print Results, 26 Geometric Solutions

**Features:** Vision Pro support

**In-app purchases:** none


### Physics AI

[App page](https://appshunter.io/ios/app/physics-ai-problem-solver/id6474350204)

This app acts as a physics problem solver, offering step-by-step solutions for various physics questions. Users can upload or photograph problems, including diagrams and handwritten notes, to receive detailed mathematical explanations. It covers a wide range of physics topics for students at all levels.

**Highlights:** Photo upload for physics problems, Step-by-step mathematical solutions, Covers high school to doctoral research, Copy and share solutions, Handles multiple choice, word-based, and diagram problems

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Physics AI Weekly Sub | $5.99 | per 7 days |
| Physics AI - Yearly Sub | $34.99 | per year |

**What reviewers like**

- 👍 Helps with physics class
- 👍 Answers most physics questions correctly
- 👍 Useful for passing online classes
- 👍 Can answer many questions easily
- 👍 Helps understand physics concepts

**What reviewers complain about**

- 🐛 Incorrect answers provided
- 🐛 App shows same question repeatedly
- 🐛 Subscription issues (advertised as free)
- 🐛 Cannot cancel subscription
- 🐛 App keeps loading, doesn't solve

**Reported bugs**

- App shows same question repeatedly
- App not letting user cancel subscription
- App keeps loading instead of solving equations
- App keeps prompting for subscription when advertised as free

**Requested features**

- Ability to talk to AI model for better photo input
- Improvement in AI interaction for photo questions


## Frequently asked questions

### Is Stress Concentration Factors 2 free?

Stress Concentration Factors 2 costs $5.99, with no in-app purchases.

### Is Physics AI free?

Physics AI is free to download, with in-app purchases available.

### Which has better reviews, Stress Concentration Factors 2 or Physics AI?

Physics AI is rated higher. Stress Concentration Factors 2 averages 3.0 out of 5 from 1 ratings, while Physics AI averages 4.5 from 289 ratings.

### Do Stress Concentration Factors 2 or Physics AI have ads?

Physics AI shows ads; Stress Concentration Factors 2 does not.

### Which is updated more often, Stress Concentration Factors 2 or Physics AI?

Stress Concentration Factors 2 ships an update every 38 months, and Physics AI fortnightly. Most recently, Stress Concentration Factors 2 was updated on November 3, 2026 and Physics AI on October 30, 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.*