What it costs
Nothing. Here is the long version.
Free, and not the trial kind
Every page, every city, the converter, the meeting planner and the dashboard. No account, no card, no trial clock running down, and nothing held back for a tier that does not exist.
No sign-up, ever, for personalization
Renaming places and arranging them in your own order need no account here, and the share link carries both.
How it will be paid for
Eventually, one modest advertisement below the clock on place pages: never above it, never between you and the answer, and never on the meeting planner. If a paid ad-free option appears it will cost a few dollars a year, and the free version will not get worse to make room.
Why say this at all
Because the incumbents made it a fair question. One charges $49 a year as the entry price for its API with no free tier. One hides its subscription price entirely. One sells an ad-free upgrade that has been closed to new buyers for months with a note about a payment problem. And the consumer app stores are full of one-star reviews about being asked to pay thirty seconds after install.
None of that is happening here. If it ever changes, this page changes with it.