# Greyswift vs C3 Data

The clearest difference is rating: Greyswift at 5.0 against C3 Data's 4.6. C3 Data's advantage is update cadence (every 5 weeks vs every 3 months) and ratings volume (8 vs 2). On price, ads, in-app purchases and monetization model there is nothing between them.

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

Greyswift holds the better App Store score, 5.0 against 4.6. Both are backed by a comparable volume of ratings — 2 and 8 respectively.

Greyswift ships an update every 3 months, C3 Data every 5 weeks. The most recent releases landed on July 22, 2026 and August 23, 2026 respectively.

## The numbers

| Metric | Greyswift | C3 Data |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/greyswift/id907241291/reviews)** | [4.6 (8 ratings)](https://appshunter.io/ios/app/c3-data/id1145515518/reviews) |
| Number of ratings | 2 | **8** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 5 weeks** |
| Monetization | Free | Free |
| Size | 90 MB | 40 MB |
| Requires iOS | **15.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Avadine](https://appshunter.io/developer/907241294) | [C3 Data](https://appshunter.io/developer/1145515517) |

## What reviewers say

### Greyswift

[App page](https://appshunter.io/ios/app/greyswift/id907241291)

This mobile application facilitates real-time or offline operational data collection, asset management, and maintenance workflows for field teams. It supports configurable forms, task management, and asset-based processes to enhance organizational efficiency.

**Highlights:** Configurable forms for field data collection, Asset and equipment tracking, Task management with statuses and notifications, Offline data entry with automatic sync, GPS-based location services, Secure data synchronization

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

**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 Greyswift free?

Greyswift 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, Greyswift or C3 Data?

Greyswift is rated higher. Greyswift averages 5.0 out of 5 from 2 ratings, while C3 Data averages 4.6 from 8 ratings.

### Do Greyswift or C3 Data have ads?

Neither Greyswift nor C3 Data shows ads.

### Which is updated more often, Greyswift or C3 Data?

Greyswift ships an update every 3 months, and C3 Data every 5 weeks. Most recently, Greyswift was updated on July 22, 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.*