# Unconfined Test

> Automated unconfined compression testing and data analysis for geotechnical engineering. (iPhone/iPad app by Geotechnical Consulting and Testing Systems.)

- Source: https://appshunter.io/ios/app/unconfined-test/id1026074798 (this page in markdown: same URL + `.md`)
- Developer: [Geotechnical Consulting and Testing Systems](https://appshunter.io/developer/539767606)
- Category: Productivity
- Price: Free
- Rating: 5.00/5 from 3 App Store ratings
- Age rating: 4+
- Requires: iOS 8.0 · 4 MB
- Languages: American English
- Released: 2015-08-10
- Data updated: 2026-06-10
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/unconfined-test/id1026074798/reviews.md

## What is Unconfined Test?

The Unconfined Compression Test Application was designed to be used in conjunction with a GCTS Wireless Point Load Testing System equipped with Unconfined Compression Test Platens. This application allows the user to easily perform and record data for an unconfined compression test by connecting wirelessly with the GCTS Point Load Testing System through Bluetooth.
All steps of test preparation can be easily read and transmitted to the application for ease-of-use. The operator can place a calibrated specimen in the Point Load Testing System for calibration of the crosshead position. The application uses a two-point calibration for the crosshead position.
By simply placing the specimen in the apparatus and applying a small load, the height of the specimen can be automatically measured. The user can continue to apply a load to the specimen, as the application will automatically begin the test once the height has been measured at the threshold load. 
The application automatically records the load and the height of the specimen during the test and creates a graph of the data in real-time. The unconfined compressive strength of the specimen will be automatically calculated and displayed at the end of the test. The application calculates and records the stress and strain on the specimen during testing, and a graph of this data can also be viewed in real-time. It also automatically calculates the Tangent Modulus at 50% strength. A real time display of the loading rate helps the user apply loads at the appropriate rate.
After performing the test, the data can be emailed direction from the application as a CSV spreadsheet. Test results are also saved in the application for later viewing.
This application also makes automatic corrections to the data to account for the frame deformation compliance. This correction gives the frame a “Virtual Infinite Stiffness” and all results are presented with this correction already performed. This means that the results given are extremely accurate.
This application must connect once to a GCTS Wireless Point Load Testing System before it can be used. Once it has connected to a system, the application may be opened and data may be viewed from any location.

## Key features

- Wireless connection to GCTS Point Load Testing System
- Automatic specimen height measurement
- Real-time load and height data recording
- Automatic calculation of compressive strength
- Real-time stress and strain graphing
- Email results as CSV spreadsheets
- Data saved for later viewing


## Frequently asked questions about Unconfined Test

### What is Unconfined Test used for?

Unconfined Test is used to perform and record data for unconfined compression tests on soil or rock specimens. It works in conjunction with a GCTS Wireless Point Load Testing System to automate measurements and calculations.

### How does Unconfined Test measure specimen height?

After placing a calibrated specimen in the apparatus, the application automatically measures the specimen's height once a small threshold load is applied. This height measurement is crucial for the subsequent test calculations.

### What calculations does Unconfined Test perform?

The application automatically calculates the unconfined compressive strength, stress, and strain of the specimen during the test. It also calculates the Tangent Modulus at 50% strength and provides a real-time display of the loading rate.

### Can I export my test results from Unconfined Test?

Yes, after performing a test, you can easily email the data directly from the application as a CSV spreadsheet. This allows for convenient sharing and further analysis of your results.

### Does Unconfined Test require a GCTS Wireless Point Load Testing System?

Yes, Unconfined Test must connect once to a GCTS Wireless Point Load Testing System via Bluetooth before it can be used. This connection is essential for the application to function and record test data.

### How accurate are the results from Unconfined Test?

The application makes automatic corrections for frame deformation compliance, giving the frame a "Virtual Infinite Stiffness." This ensures that all presented results are extremely accurate.

### What devices is Unconfined Test available on?

Unconfined Test is available for iPhone and iPod devices. It requires a Bluetooth connection to the GCTS Wireless Point Load Testing System to operate.

### How often is Unconfined Test updated?

The last update for Unconfined Test was on December 5, 2019, with version 1.32. The application was initially released on August 10, 2015.

## Version history (last 5 releases)

### 1.32 — 2019-12-05

- Fixed issues with gap 2-point calibration when using English units
- Fixed crash on main screen when connection times out
- Added more information to factor export from calibration hub

### 1.31 — 2019-10-31

- Fixed issue where app would crash when trying to export a project without an image
- Added new required privacy descriptor

### 1.3 — 2019-08-06

- Fixed issues with unlocking mechanism when connecting to the PLT-2W.
- Updated some libraries to work better with newer iOS versions.

### 1.2 — 2017-01-25

Updates
•Calibration factors are now stored in the PLT device, allowing the user to change iOS devices and get the factors automatically*
•Added more connection status checks to improve reliability

*May require a firmware update

Minor Bug Fixes
•Fixed a bug where an alert message popped up repeatedly in the measurements screen
•Resolved issues with privacy settings and graphing library after iOS 10 update
•Various crashes are now handled appropriately
•Fixed scaling issues
•Changed the format of values being displayed
•Reorganized layout for better usability

### 1.1 — 2016-02-11

Updates
•Added compatibility with the GCTS ULT-2 system for ultrasonic measurements
•Added ULT settings in settings screen
•Included 2-point calibration option for the ULT-2
•Revamped test screen UI for a cleaner look and inclusion of P-Wave velocity and load rate
•Updated graphing library for improved performance

Minor Bug Fixes
•Fixed a bug where the confirmation dialog for measurements would enter a loop in some instances
• Software now correctly displays sensor voltage range as 0 – 5V
•The information for performing a calibration of the displacement sensor has been updated
•In some rare cases, scaling for the graph during a test reacted poorly, this has been fixed
•Miscellaneous code optimization for better performance

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All apps by Geotechnical Consulting and Testing Systems: https://appshunter.io/developer/539767606

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-10.*