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>It does not require a subscription/login, instead it stores progress through the HTML5 web storage API I wish more websites did this.

• codingdave 3y ago
  It is awesome for short-term usage, but has a 5 MB limit, doesn't transfer across browsers or devices, and can simply go away if you clear it, reinstall browsers, etc. So it is not reliable in the long run.
  • grondilu 3y ago
    It's not always going to remain limited to 5MB, which is probably much enough for an opening repertoire anyway. Also it shouldn't be too hard to create an export/import button. I'd argue it's more reliable than having your progress stored on a server that can close anytime, as memchess did.
  • lxgr 3y ago
    On Safari, it’s also cleared after 7 consecutive days of not visiting a website, I believe.