What a uk.app name is, and what it is not
uk.app sells names of the form yourname.uk.app for a website, a home server, or a side project; it is a name under uk.app's own domain, not a domain from the United Kingdom's national registry. A standard name costs £4.99 a year and renews automatically, and every name comes with managed DNS, dynamic DNS, and REST API access.
If you are starting your own site about access, availability, or anything else, you need a name for it before anything else. uk.app is one option, and it is worth being precise about what it actually sells.
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What a uk.app name actually is
uk.app sells names in the form yourname.uk.app, a name under the uk.app domain itself, not an address from the United Kingdom's national domain registry. If your project needs a name from that national registry for legal or branding reasons, this is not that; if a short, working address is what you need, it is a direct way to get one.
Price and renewal
A standard name costs £4.99 a year. Premium names, which are typically shorter or more generic, are priced separately and shown when you search for them. Every name renews automatically each year at that rate unless you cancel it, so budget for the ongoing cost rather than treating the first year's price as a one-time fee.
What comes with the name
Every yourname.uk.app name includes managed DNS, so you can point it at your hosting without running your own name servers. It also includes dynamic DNS, useful if you are hosting from a home server whose address changes, and REST API access for managing the name programmatically instead of through the site's interface by hand.
Checking availability
Availability and current price are checked live on the uk.app site itself rather than published as a fixed list, since premium names are priced individually. There is also a WHOIS lookup on the site if you want to see who currently holds a name. Search the exact name you want before assuming it is free.
Getting your project live
Search your desired name, confirm the price shown, and register it. Point the managed DNS at wherever you are hosting the actual site or server. If the project runs from a home connection rather than a hosting provider, set up the included dynamic DNS so the name keeps following the connection's current address instead of going stale.
Managing the name by API
Because REST API access is included with every name, you can check a record, update the dynamic DNS entry, or script a renewal reminder without opening the site's dashboard each time. That matters more for a home server or a small side project than for a one-off page, since those are the cases where you are likely to touch the DNS settings again after the initial setup.