Stack Overflow and the wider Stack Exchange network on iPhone and iPad
OctostackRead, search and join the discussion.
A native app for Stack Exchange's questions and answers. Browse without an account, and vote, answer and comment for free when you sign in.
Free to download and use. On the App Store since August 2025.
A look inside
Free for everyone
You don't need Ultra to take part: voting, answering and commenting are free on every site.
Vote, answer and comment
Sign in to take part on any community. What you can do depends on that community's own permissions.
Browse without an account
Read questions and answers across Stack Overflow and the wider Stack Exchange network, straight away.
Search
Find questions, users and tags.
Code that reads well
Syntax highlighting and clear formatting for code in posts.
Switch communities
Move between Stack Exchange communities whenever you like.
Light and dark
Octostack follows light and dark mode, with your choice of theme and tint colour.
Octostack Ultra
Ultra is an optional subscription that supports independent development. Everything above stays free without it.
Goldie
An alternate app icon, just for Ultra.
What's next
Early access to upcoming premium features.
The App Store and the app show the price before you buy.
Secure sign-in
You log in on Stack Exchange's own page, so Octostack never sees your password. Your access token is kept in your device's Keychain. You don't need an account to browse: sign in only when you want to take part.
Get Octostack
Octostack is an independent, unofficial client. It is not affiliated with or endorsed by Stack Exchange, Inc. Stack Overflow and Stack Exchange are trademarks of Stack Exchange, Inc. Octostack is made by Late Lunch, an independent app studio from Spain.