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Slido vs Claper: catalog facts
Slido	Claper
Freemium A free plan is available, with paid plans for more features.	Free Open source under AGPL-3.0 and free to self-host.
Web	Web, Self-hosted
Anonymous questions with upvoting Polls, quizzes, surveys and word clouds in one tool	Live polls and audience questions during a talk Participants join from their own devices
Hosted service that needs an internet connection Participant data is stored on the provider's servers	Self-hosting requires running an Elixir application Research does not detail hosted plans or pricing
Web application, Hosted service	Self-hosted
Closed source	Open source
License not stated	License: AGPL-3.0
Not stated if an account is needed	Not stated if an account is needed
Needs internet	Needs internet
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.