The best alternatives to Do It Later are Boomerang for Gmail, Buffer, and Buffer for Mac. If these 3 options don't work for you, we've listed a few more alternatives below.
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Auth. is a 2FA and OTP management tool for everyone. Works with all Apple personal devices using iCloud Keychain. Scan the QR Code and Done! Or you may add your account manually from your provider. Safari extension is also available for auto-fill-in.