These two get shortlisted together because both are cheap, both are narrow, and both promise a site finished in an afternoon. They are less alike than that suggests, and the difference is how many pages you end up with.
How much site you actually get
Carrd builds one page. That is the product, not a limitation of a tier — a single scrolling page, a handful of sections, and almost nothing to configure. For a business whose website needs to state what it does, where it is and how to get in touch, that is a complete answer at a few dollars a year.
Umso looks like a one-page tool only because its free plan is limited to a homepage. Its first paid tier publishes up to ten pages and the tier above removes the limit, and the vendor's own announcement frames the single-page cap as a restriction it removed. It is a small-site builder, not a one-page one.
That changes who each suits. A trades business needs Carrd. A startup with a product page, a pricing page and a careers page needs the other.
What each costs to run
Carrd is priced per account and is among the least expensive things in this directory. Umso is priced per site, which is inexpensive for one project and multiplies immediately for anyone running several — an agency or a founder with three ideas pays three times.
Documentation is where Umso is weaker. Its pricing page, features page and help centre all returned too little to read, so several of its capabilities are recorded here as absent from a marketing list rather than as confirmed absences. Carrd's limits are at least fully published.
Which should you choose?
Choose Carrd if the site is genuinely one page and you want the cheapest credible way to put it on your own domain, with nothing to maintain afterwards.
Choose Umso if you need a small handful of pages with a consistent look and are running one project rather than several. Check the current feature list against your own requirements first, because the vendor publishes less of it than most.
Carrd
One page, a few dollars a year, and nothing at all to configure.

Umso
Keeps the editor deliberately narrow so a startup site takes an afternoon.
Specs
Ratings
Ease for a beginner
Design and templates
Room to grow
Help when you are stuck
Value for money
Features
Pricing
Carrd
Umso
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