AlternativeTo requirements
A verified email address on the account
Product name and official URL
A short description, one sentence
A full description
Pricing: free, freemium, free for personal use or commercial
Tags, from their own closed vocabulary
Platforms, where a web app is "Online"
A company or author record, which you can create inline
A square icon, 128x128 or larger
Screenshots with captionsoptional
Purchase and subscription prices, which they say make the app easier to findoptional
$5 for priority reviewoptional
Gotchas
Their decline list explicitly names directories, collections of online tools, review and comparison websites and guides and tutorials. If your product is one of those, months of queue end in a decline nobody explains.
The free queue is not slow, it is unbounded: their own form says a new app usually sits for at least a few months, and My submissions repeats it as "expect a few months".
Google signup is turned off at the moment. Existing Google logins still work, but a new account has to come from GitHub, Apple, or an email and password.
Alternatives are the whole game. Their own warning is that an app without them is almost invisible in search, and the prompt only appears after you have submitted.
The outbound link on an app page is rel="nofollow noopener", so the case for the wait is their search traffic and nothing else.
A declined app just vanishes from My submissions. There is no rejection state to read, so an empty list means either approved or refused.