# StemFox Scientific Calculator vs SEC Heat Transfer

The clearest difference is in-app purchases: SEC Heat Transfer at none against StemFox Scientific Calculator's 6. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. StemFox Scientific Calculator sells 6 in-app purchases, starting at $2.99 per month. SEC Heat Transfer asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 3 months. The most recent releases landed on November 2, 2026 and November 7, 2026 respectively.

## The numbers

| Metric | StemFox Scientific Calculator | SEC Heat Transfer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (11 ratings)](https://appshunter.io/ios/app/stemfox-scientific-calculator/id1411592118/reviews)** | — |
| Number of ratings | **11** | — |
| Positive reviews | 90.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 months | Every 3 months |
| Monetization | Freemium | — |
| Size | 24 MB | 10 MB |
| Requires iOS | 15 | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Joshua Bryson](https://appshunter.io/developer/1367675392) | [S.E.C. Accessories Limited](https://appshunter.io/developer/1483746720) |

## What reviewers say

### StemFox Scientific Calculator

[App page](https://appshunter.io/ios/app/stemfox-scientific-calculator/id1411592118)

Streamline complex STEM calculations with a powerful calculator, textbook equation solver, and comprehensive unit converter. Designed for engineers, it reduces busywork and improves accuracy for homework and technical tasks.

**Highlights:** Advanced scientific calculator with 80+ functions, Textbook equation solver for any variable, Searchable equation database by chapter, Fast table lookup with linear interpolation, Comprehensive unit converter with 300+ conversions, Copy and paste functionality for values and equations

**Features:** Vision Pro support

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly - Unlimited | $2.99 | per month |
| Yearly - Unlimited | $9.99 | per year |
| Donut | $0.99 | one-time |
| Drink | $2.99 | one-time |
| Taco | $4.99 | one-time |
| Pizza | $9.99 | one-time |


### SEC Heat Transfer

[App page](https://appshunter.io/ios/app/sec-heat-transfer/id1483746721)

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

**In-app purchases:** none


## Frequently asked questions

### Is StemFox Scientific Calculator free?

StemFox Scientific Calculator is free to download, with in-app purchases available.

### Is SEC Heat Transfer free?

SEC Heat Transfer is free to download, with no in-app purchases.

### Do StemFox Scientific Calculator or SEC Heat Transfer have ads?

Neither StemFox Scientific Calculator nor SEC Heat Transfer shows ads.

### Which is updated more often, StemFox Scientific Calculator or SEC Heat Transfer?

StemFox Scientific Calculator ships an update every 3 months, and SEC Heat Transfer every 3 months. Most recently, StemFox Scientific Calculator was updated on November 2, 2026 and SEC Heat Transfer on November 7, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*