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To sync your checkboxes across all devices, you need a free JSONBin account. Takes 2 minutes — do this once.
Go to jsonbin.io → Sign Up (free, no credit card)
Click "Create Bin" → paste {} as content → Save. Copy the Bin ID from the URL (looks like 64abc123...)
Go to Account → API Keys → Copy your Master Key
Could not connect — check your Bin ID and API Key and try again.