AvantGo was a technology company focused on bringing a full W3C-compliant browser experience to intermittently-connected mobile devices such as the personal digital assistants (PDAs) and extremely early smartphones of that time period.

Their browser could work with a live internet connection, but their core technology was the ability to sync web pages (including forms and Javascript) to the device, allow the user to interact with them even while off-line, and then forward any results (primarily HTTP POST messages) the next time the device synced.

Despite this, the company is primarily remembered for their proof-of-technology demo service, which allowed users to set up a free account and subscribe to web pages and "content channels", which they could then view offline.

While the free service was quite popular, it was not successful in marketing the technology to the intended customers.

On Dec 12, 2002, the company was sold to Sybase for $38 million, only a bit more than the cash it had on hand.