Why Clank comes first
We make Clank and prefer its approach. Our recommendations give the most weight to free software, the MIT license, ordinary NFC tags, and app blocking that runs on the iPhone. That makes Clank our editorial number one. It is not an independent award or a claim that Clank is the best option for every reader.
Someone who needs an Android app, a desktop blocker, team collaboration, or a download they can install today may be better served by another product. We include those differences in each comparison.
How we research
We compare competitors using their official websites, documentation, and store listings. For Clank, we use the app's implementation and project documentation. Sources are linked alongside claims and collected at the end of each article.
These are comparisons of documented features. We do not claim to have run a hands-on test unless an article describes the test and its evidence. We do not invent ratings, testimonials, screen-time reductions, or productivity results.
There are no paid placements or affiliate links in these articles. Product prices and availability can change. The review date is shown on every article.
Clank's current availability
As of 9 September 2026, Clank is in pre-release for iPhone with iOS 17 or later. The project uses the MIT license, but the repository is currently private. There is no public source release, App Store download, or TestFlight link yet.
The app is built around ordinary compatible NFC stickers, cards, and keychains. It does not require branded hardware. Once public source access is available, building the iPhone app will require a Mac, Xcode, and Apple development setup. Any Apple development costs are separate from Clank.
Check the release status on the home page before buying a tag specifically for Clank.
Corrections
To report a factual error, use the contact details for DCTR s.r.o. and include the article URL, the claim, and a primary source showing the correction.