Sorted by what you pay, with the thing that makes cheap tools expensive stated up front: per-channel pricing. A $5 tool is $40 by the eighth account, and the eighth account is where most people end up.
Worth knowing: Entry price from each vendor's own site, with per-channel pricing called out. Tools that only send you a reminder to post manually are excluded — every one here publishes natively.
$5 a month for one account on Professional, then $4 per extra. Cheapest entry here, and the free tier of three accounts may be all you need. Every tenth account is free.
$5 a month per channel on Essentials, with the rate dropping past ten channels. Same shape as Publer: cheap to start, not cheap to grow.
€9.99 a month for eight channels, flat. More expensive than the two above at one channel, cheaper than both from about the third, and the price stops moving after that.
From €20 a month, and you are buying the analytics as much as the scheduling. The free tier covers one brand at 20 posts a month.
$29 a month for five profiles. Not the cheapest, but the evergreen recycling means fewer posts to write, which is its own kind of saving.
Free if you self-host, $29 a month for five channels if you do not. The cheapest possible option and the most expensive in hours.
Around the third or fourth channel. At $4-5 each, eight channels is $32-40 a month, which is more than most flat-rate plans covering the same eight.
Because X charges for API posting and a link post costs more than a plain one. Tools either exclude it from cheap tiers, as Publer and Planable do, or meter it — Eurekuh gives each paid plan a posting allowance and shows the cost before you schedule.
Connect your accounts, upload a video, and publish. Takes less than a minute. Free to start — see plans.