Confluence is the cheapest verified alternative to Superhuman Docs: Confluence Standard costs $80.40 a year against the $144 Superhuman Docs Pro costs, so $63.60 stays in your account. 7 options below, ranked by yearly cost, each with its own verified cancellation guide.
Superhuman Docs Superhuman Docs Pro Ranked by yearly cost, cheapest first. Each one links to our own verified guide, so you can see how hard it is to leave later.
Confluence Confluence Standard plan $6.70 / user / month 
Notion Notion Plus plan $10 / member / month Why this one - Flexible documents and databases
Airtable Airtable Team plan $24 / collaborator / month Why this one - Database-first team workflows
GitBook GitBook Premium plan $65 / site / month, billed annually 
Fern Fern Team plan $150 / month 
ReadMe ReadMe Pro plan $250 / month, billed annually No one pays for a spot here - the cheapest option simply goes first, the Switch button goes straight to the provider, and every card links to our own verified guide.
Every price and cancellation route on this page is checked against the provider's own pricing page, terms and support documentation - then dated, so you can see how fresh it is.