We are proud to offer a range of software for Go players, for the iPhone as well as the desktop.

SmartGo (iPhone)
Play Go against your iPhone or iPod touch. SmartGo automatically adjusts the handicap to keep the game interesting. Start with 9x9, and unlock 11x11 and 13x13 as you get stronger.
SmartGo Pro (iPhone)
Carry more than 12,000 professional Go games in your pocket, and take advantage of your spare minutes or hours to study Go. SmartGo Pro makes it easy to find hundreds of games by your favorite players, including Honinbo Shusaku, Go Seigen, Takemiya Masaki, and Yi Ch'ang-ho.
With over 2,000 Go problems at all levels of difficulty, you'll be able to practice your Go skills on the go.
SmartGo Pro includes all the features of SmartGo while allowing computer play up to 19x19. Click to compare SmartGo and SmartGo Pro.
SmartGo Pro was rated 4½ mice (out of 5) by Macworld.
SmartGo (Windows)
SmartGo for Windows is the complete tool for Go players, with a database of more than 45,000 professional games. Compared to other Go programs, SmartGo is more powerful and easier to use. It's a tool to play, record, replay, analyze, annotate, and print Go games. If you ever deal with SGF files, you want SmartGo.
SmartGo (Macintosh)
We're working on a version of SmartGo for the Apple Macintosh, and will announce further details when appropriate.