# HCC2D Decoder — Decoding HCC2D and QR codes.

> Decoding HCC2D and QR codes. (iPhone/iPad app by Marco Querini.)

- Source: https://appshunter.io/ios/app/hcc2d-decoder/id6762202762 (this page in markdown: same URL + `.md`)
- Developer: [Marco Querini](https://appshunter.io/developer/1893348109)
- Category: Utilities
- Price: Free
- Age rating: 4+
- Requires: iOS 17.0 · 8 MB
- Languages: American English, Italian, Japanese, Chinese (Simplified, China), European Spanish
- Released: 2026-04-15
- Data updated: 2026-09-03
- User reviews in markdown: https://appshunter.io/ios/app/hcc2d-decoder/id6762202762/reviews.md

## What is HCC2D Decoder?

This app allows you to scan and decode HCC2D and QR code symbols using your mobile camera. It is based on advanced research in high-capacity barcode technologies and provides reliable decoding.

Key features:

* Decode HCC2D color codes.
* Full support for standard QR codes.
* Real-time scanning using the camera.
* Robust detection and error correction.
* No ads and no registration required.

HCC2D is a color two-dimensional code format that increases data capacity compared to traditional QR codes while preserving their structure. By using multiple colors, each module can encode more information, enabling higher data density in a compact symbol.

The app captures images, detects barcode regions, corrects perspective distortions, and analyzes color or intensity patterns to reconstruct the encoded data.

To transfer files from a desktop computer to your smartphone via a stream of HCC2D codes, use HCC2D Decoder together with the HCC2D Streamer desktop companion app.

Notes:

HCC2D codes can be created using the official online generator at hcc2d.com, the HCC2D Encoder application, the open-source CLI encoder, or the Debian/Ubuntu packages provided through the official HCC2D APT repository.

* Low-quality color printing may reduce decoding performance
* Best results are achieved with screen-displayed or high-quality printed codes and a high-resolution autofocus camera.
* One-dimensional barcodes are intentionally not supported.

References:
* Querini, M. (2010). Analisi e progettazione di codici bidimensionali ad alta capacità. Sviluppo del lettore per gli ambienti desktop e mobile. Master's Thesis. https://librarysearch.uniroma2.it/discovery/fulldisplay?vid=39RM_2DUE:39RM2_VIEW&docid=alma990002339160402652&lang=en
* Querini, M. (2010-2026). HCC2D Code Specification  — Version 0.9.0. The specification is available on the official HCC2D website. Licensed under the Creative Commons Attribution-NoDerivatives 4.0 International License (CC BY-ND 4.0).
* Querini, M. and Italiano, G. F. (2014). Reliability and Data Density in High Capacity Color Barcodes. Computer Science and Information Systems, 11(4), 1595-1615.
* Querini, M., Grillo, A., Lentini, A., and Italiano, G. F. (2011). 2D Color Barcodes for Mobile Phones. IJCSA, 8(1), 136-155.

Notice:
This application is an independent personal project and is not affiliated with any organization or institution.


## Version history (last 5 releases)

### 1.2.5 — 2026-08-30

• Improved stability and compatibility across supported OS versions.
• Improved color classification and sampling after geometry refinement.

### 1.2.3 — 2026-06-20

• Added support for multi-symbol streaming transfer with HCC2DST (HCC2D Streaming Transfer Protocol): the decoder reconstructs files transmitted as a sequence of HCC2D symbols even when some symbols are missing.
• Improved the HCC2D sampling and decoding algorithm, especially for printed codes.

### 1.2.2 — 2026-05-26

• The HCC2D sampling and decoding algorithm has been improved, especially for printed codes.
• The Terms of Service have been updated.

### 1.2.1 — 2026-05-07

• You can now search your scan history.
• The color sampling algorithm has been improved for more accurate decoding.
• You can now decode from an image in addition to the live camera.
• HCC2D code decoding is now even more reliable.

### 1.1.16 — 2026-04-27

• Now users who deny or revoke camera permission can continue to use the app by accessing the Scan History and More sections.
• Enhanced privacy policy for greater transparency.
• Privacy policy acceptance is now required at first launch to reinforce a privacy-first experience.

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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 2026-09-03.*