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Feature checklists make every tool look equivalent. This table leads with the three things that actually differ — what it costs you before it works, whether your files leave your device, and where the free version stops.
| Slidoslido.com | Mentimetermentimeter.com | Cal.comcal.com | Calendlycalendly.com | |
|---|---|---|---|---|
| What it does | Collects audience questions and upvotes them so the best ones rise | Live polls and word clouds that build on screen as people answer | Open-source scheduling links you can run on your own server | Send a link and let people book a slot your calendar says is free |
| What it costs you | Free tierA genuinely usable free tier with paid plans for volume or team features. | Free tierA genuinely usable free tier with paid plans for volume or team features. | Free tierA genuinely usable free tier with paid plans for volume or team features. | Free tierA genuinely usable free tier with paid plans for volume or team features. |
| Your files | Runs on their server | Runs on their server | Runs on their server | Runs on their server |
| Where it stops | Free events allow 100 participants and three polls, and results cannot be downloaded afterwards. | Free accounts can engage only 50 participants per rolling month before presenting is cut off. | Team scheduling, routing forms and white-labelling are paid — only the individual booking page is free. | One active event type on the free plan, and the booking page carries Calendly branding. |
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| Category | Collaboration & Meetings | Collaboration & Meetings | Collaboration & Meetings | Collaboration & Meetings |
| Last checked | 2026-07-29 | 2026-07-29 | 2026-07-29 | 2026-07-29 |
| Open the site | Open | Open | Open | Open |
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