Which mind mapping app should I use?

Xmind, for most people mapping on their own: it runs on Windows, Mac, iPad and phones, the free plan does classic mind maps, and Pro is US$4.92 a month billed yearly. MindMeister is the one to map with a team in the browser, free for 3 maps, then Personal at $3.50 and Pro at $5.50 a user a month. Miro suits a mind map that is one part of a bigger workshop board, free for 3 editable boards and $8 a member a month on Starter billed yearly. Whimsical mixes mind maps, flowcharts and wireframes, free to try and $10 an editor a month on Pro. For no subscription at all, Freeplane is a free, open-source desktop app. Rule: if you map alone, pick Xmind; if you map in meetings, pick MindMeister or Miro.