# Requirements

1Password supports the following systems, web browsers, and applications.

### Operating Systems

- Mac OS X 10.6 (Snow Leopard)
- Mac OS X 10.5 (Leopard)
- Mac OS X 10.4 (Tiger) 1Password 2 only. See Using 1Password 2 on Tiger for details.

### Supported Web Browsers and Applications

These browsers and applications are fully supported and have 1Password’s functionality integrated directly into them via our plugins:

- Safari 4
- Firefox 3
- Camino 2
- Flock 2
- OmniWeb 5
- Fluid
- iCab 4
- WebKit
- NetNewsWire 3
- DEVONagent 2
- Google Chrome: Support for this browser is in progress. You can get a little 1Password in Chrome now with the Logins Bookmarklet feature, or, if you are feeling more adventurous, you can try an early alpha version of 1Password Chrome extension by joining us in the Chrome support forum.

The following browsers do not provide direct 1Password integration:

- Opera: Opera is a great browser and we would love to support it. Unfortunately, at this time, Opera does not provide the extension mechanism required for 1Password. In February, 2009, we again discussed this with Opera’s Mac developers and were informed that the necessary code changes cannot be made for the 10.x versions. We very much appreciate the interest in this collaboration and hope that we will be able to support Opera in the future.
- Netscape: Netscape officially dropped support for this browser as of March 1, 2008. Please try Firefox or Flock instead. Both are fully supported by 1Password.
- Internet Explorer: Microsoft officially dropped support for this browser as of December 31, 2005. Please try Safari instead.
- Shiira: The future of this browser is uncertain as of this writing, and no efforts are currently being made to add Shiira support to 1Password.
- Cruz (formerly “Mecca”): Support for this browser is being considered.

## 1Password for iOS Requirements

1Password for iPhone and 1Password Pro can be installed on any iPhone or iPod touch running iOS 3.1.3 or later. 1Password for iPad and 1Password Pro can be installed on any iPad running iOS 3.2 or later.

## 1Password for Palm Requirements

Palm handheld or Treo smartphone running Palm OS 4 or higher with 150KB of free space. Additional space is required for the 1Password data file, which depends on the number of items you have. Each 1Password item requires about 3KB, so 1,000 1Password items will require approximately 3MB of space.

## Next: Installation and Setup