Incredible!
If you collect or sell doorknobs, this app is a MUST HAVE! Well designed, user friendly and, it WORKS! This will save me tons of time. Thanks so much!
Free
About
Identify antique doorknobs using your phone's camera and explore a vast archive of over 4,000 cataloged items. This app allows for offline identification and browsing, with options to contribute to improving the database. It's designed for collectors, dealers, and enthusiasts of ornamental hardware.
✓Identify doorknobs with camera
✓Offline archive access
✓Browse by name, ID, or manufacturer
✓Contribute to database improvements
✓Search by sight
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What's New in ADCA
1.2.0
October 7, 2026
Bug fixes
User reviews
Developer apps
FAQ
How does ADCA - Knobs identify doorknobs?
ADCA - Knobs uses your phone's camera to capture an image of a doorknob. The app then matches this image against its extensive archive of over 4,000 cataloged doorknobs.
Does ADCA - Knobs require an internet connection?
No, ADCA - Knobs does not require an internet connection. The entire catalog and the matching model are stored directly on your phone, allowing for offline identification and browsing.
Can I contribute to the ADCA - Knobs archive?
Yes, users can help improve the app by correcting identifications or submitting better photos of doorknobs. All contributions are reviewed by the Antique Doorknob Collectors of America before being accepted.
What information can I find about doorknobs in the archive?
The archive is organized by ADCA's classification system and allows you to search for doorknobs by name, ID, or manufacturer. Each entry contains details about the cataloged item.
Is ADCA - Knobs suitable for all ages?
ADCA - Knobs has an age rating of 4+, making it suitable for younger users. The app focuses on historical and collectible items, offering educational value for a broad audience.
How often is ADCA - Knobs updated?
The latest version of ADCA - Knobs is 1.2.0, which was last updated on October 7, 2026. Updates typically include improvements to the catalog and identification accuracy.
What devices does ADCA - Knobs support?
ADCA - Knobs is currently supported on iPhones. The app is designed to leverage the camera and processing capabilities of these devices for its identification features.
Does ADCA - Knobs have ads?
No, ADCA - Knobs does not contain advertisements. As a free application, it provides an uninterrupted experience for users exploring the antique doorknob archive.
