The latest versions of the Mac and iOS versions of OmniFocus, OmniGraffle, OmniOutliner and OmniPlan offer localizations in many languages! With the exception of OmniOutliner 5 for Mac (see below), our currently-shipping apps are available in English, Dutch, French, German, Italian, Japanese, Russian, Simplified Chinese, and Spanish. OmniFocus 2 for Mac and OmniPlan 3 for Mac and iOS are also available in Brazilian Portuguese and Korean.
There’s only one download for each app, and the interface will automatically change based upon your macOS and iOS language settings. Our apps look to your language preferences in System Preferences ▸ Language & Region (Mac), or Settings.app ▸ General ▸ Language & Region (iOS). If you have multiple preferred languages, you can set the order of preference in that section by dragging to rearrange the languages in your preferred order.
Note: The initial release of OmniOutliner 5 for Mac is only available in English for the time being, but we are currently working on localizations for the new version. Please keep an eye on our Release Notes page to be notified when OmniOutliner 5 localizations are available!