AutoSMS is a Chrome extension developed by David Luu that allows users to send SMS text messages for free without the need for registration. Built against the free AutoSMS API, this extension provides a convenient way to send messages without any limitations on the number of messages sent.

One limitation of this extension is that SMS support is limited to carriers listed within the extension. If no carriers are listed, it may indicate that the SMS service is currently down. Additionally, the extension does not offer the option to supply a reply number or address for recipients to reply to, although this information can be included in the SMS message if needed.