# TEC Auto Test vs C3 Data

The clearest difference is update cadence: C3 Data at every 5 weeks against TEC Auto Test's every 3 months. TEC Auto Test's advantage is iOS requirement (12.0 vs 15.6). On price, rating, ratings volume and ads there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 4.5 for TEC Auto Test against 4.6 for C3 Data. Both are backed by a comparable volume of ratings — 4 and 8 respectively.

TEC Auto Test ships an update every 3 months, C3 Data every 5 weeks. The most recent releases landed on June 1, 2026 and August 23, 2026 respectively.

## The numbers

| Metric | TEC Auto Test | C3 Data |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (4 ratings)](https://appshunter.io/ios/app/tec-auto-test/id1123783405/reviews) | **[4.6 (8 ratings)](https://appshunter.io/ios/app/c3-data/id1145515518/reviews)** |
| Number of ratings | 4 | **8** |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 5 weeks** |
| Monetization | Free | Free |
| Size | 18 MB | 40 MB |
| Requires iOS | **12.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [The Energy Conservatory](https://appshunter.io/developer/504703668) | [C3 Data](https://appshunter.io/developer/1145515517) |

## What reviewers say

### TEC Auto Test

[App page](https://appshunter.io/ios/app/tec-auto-test/id1123783405)

This app automates building envelope and duct system airtightness testing by wirelessly connecting to specific pressure gauges. It collects test data, calculates results, and generates PDF reports, with features like wind assistance for improved accuracy.

**Highlights:** Automated building envelope and duct system testing, Wireless connection to DG-1000 and DG-700 gauges, PDF report generation and export, Geotagging and time stamping of projects, Wind Assistant for improved test accuracy, Support for multiple airtightness test standards

**In-app purchases:** none


### C3 Data

[App page](https://appshunter.io/ios/app/c3-data/id1145515518)

This application helps pyrometry laboratories and heat treat plants track compliance with industry standards. It provides instant visual feedback on test results against specified criteria, supporting various data collection needs for furnaces.

**Highlights:** Nadcap and CQI-9 compliance tracking, Calibration, SAT, and TUS data collection, Instant pass/fail visual indicators, Test and instrument management, On- and offline operation, Zebra Bluetooth printer support

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

**In-app purchases:** none


## Frequently asked questions

### Is TEC Auto Test free?

TEC Auto Test is free to download, with no in-app purchases.

### Is C3 Data free?

C3 Data is free to download, with no in-app purchases.

### Which has better reviews, TEC Auto Test or C3 Data?

C3 Data is rated higher. TEC Auto Test averages 4.5 out of 5 from 4 ratings, while C3 Data averages 4.6 from 8 ratings.

### Do TEC Auto Test or C3 Data have ads?

Neither TEC Auto Test nor C3 Data shows ads.

### Which is updated more often, TEC Auto Test or C3 Data?

TEC Auto Test ships an update every 3 months, and C3 Data every 5 weeks. Most recently, TEC Auto Test was updated on June 1, 2026 and C3 Data on August 23, 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.*