# CORE Calculator App vs Stud Finder®

The clearest difference is review sentiment: CORE Calculator App at 100% against Stud Finder®'s 8%. CORE Calculator App also leads on rating (5.0 vs 4.4). Stud Finder®'s advantage is ratings volume (23K vs 11) and update cadence (every 5 weeks vs every 3 months). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. CORE Calculator App sells 3 in-app purchases, starting at $4.99 per month and Stud Finder® sells 2 in-app purchases, starting at $1.99 per 7 days. Whichever you choose, the download price is not the number that matters.

CORE Calculator App holds the better App Store score, 5.0 against 4.4. That said, the two scores are not equally well evidenced: Stud Finder® has 23K ratings behind it against 11, so its average is the more settled of the two. Written reviews point the same way: 100% of CORE Calculator App's written reviews are positive against 8% of Stud Finder®'s.

CORE Calculator App ships an update every 3 months, Stud Finder® every 5 weeks. The most recent releases landed on October 17, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | CORE Calculator App | Stud Finder® |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (11 ratings)](https://appshunter.io/ios/app/core-calculator-app/id1447118499/reviews)** | [4.4 (23K ratings)](https://appshunter.io/ios/app/stud-finder/id1484289588/reviews) |
| Number of ratings | 11 | **23K** |
| Positive reviews | **100.0% of reviews** | 7.8% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 5 weeks** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 148 MB | 24 MB |
| Requires iOS | **14.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [AsInt Inc.](https://appshunter.io/developer/1438397626) | [Tue Nguyen Minh](https://appshunter.io/developer/434811167) |

## What reviewers say

### CORE Calculator App

[App page](https://appshunter.io/ios/app/core-calculator-app/id1447118499)

This app provides inspectors in the oil and gas industry with essential calculations for asset integrity. It offers tools for determining Tmin, MAWP, corrosion rates, and remaining life based on industry standards.

**Highlights:** Tmin calculations, MAWP calculations, Corrosion rate calculations, Remaining life determination, Construction material information, Damage mechanism identification

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Materials Lookup | $4.99 | per month |
| Damage Mech Screener | $9.99 | per month |
| Materials Lookup | $5.99 | one-time |


### Stud Finder®

[App page](https://appshunter.io/ios/app/stud-finder/id1484289588)

This utility app uses your iPhone's magnetometer to detect metal studs behind walls. Simply hold your device near the wall and observe the indicator for changes in the magnetic field. For best results, remove any external case from your phone.

**Highlights:** Detect metal studs, Uses magnetometer, Measures magnetic field, Indicator for metal proximity, Instructions for accuracy

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Stud Finder Pro (Weekly) | $1.99 | per 7 days |
| Pro Features | $1.99 | one-time |

**What reviewers like**

- 🚀 Accurately detects metal objects
- 💡 Innovative use of phone sensors
- 👍 Helpful for specific use cases

**What reviewers complain about**

- 🔒 Aggressive monetization with constant upgrade prompts
- 🐛 Inconsistent and unreliable performance
- 👎 Limited functionality in free version
- 🕰️ Extremely short usage time before lockout

**Reported bugs**

- Fails to detect known metal objects
- Erratic behavior and constant beeping
- Upgrade issues even after purchase

**Requested features**

- Ability to detect wooden studs
- Longer free trial period
- More intuitive user interface


## Frequently asked questions

### Is CORE Calculator App free?

CORE Calculator App is free to download, with in-app purchases available.

### Is Stud Finder® free?

Stud Finder® is free to download, with in-app purchases available.

### Which has better reviews, CORE Calculator App or Stud Finder®?

CORE Calculator App is rated higher. CORE Calculator App averages 5.0 out of 5 from 11 ratings, while Stud Finder® averages 4.4 from 23K ratings.

### Do CORE Calculator App or Stud Finder® have ads?

Neither CORE Calculator App nor Stud Finder® shows ads.

### Which is updated more often, CORE Calculator App or Stud Finder®?

CORE Calculator App ships an update every 3 months, and Stud Finder® every 5 weeks. Most recently, CORE Calculator App was updated on October 17, 2026 and Stud Finder® on October 24, 2026.

---

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