An oo3 file extension is related to the OmniOutliner, a program for organizing information.

Detailed description

Software that open oo3 file

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OO3 file extension - OmniOutliner data

What is oo3 file? How to open oo3 files?

File type specification:

Various data file type icon Various data file type

The oo3 file extension is associated with the OmniOutliner, an information organizer for Apple Mac computers, developed by The Omni Group.

The oo3 file contains information, texts, spreadsheets and others.

The default software associated to open oo3 file:

OmniOutliner icon

The Omni Group logoOmniOutliner  Apple macOS / Mac OS X software

Company or developer:
The Omni Group

OmniOutliner is an amazingly flexible program for creating, collecting, and organizing information. Use OmniOutliner's document structure to brainstorm new ideas, drill out specifics, and line up the steps needed to get everything done.

Help how to open:

Use OmniOutliner to open *.oo3 files.

How to convert:

Can be exported to *.key, *.docx, *.rtf, *.tex, *.opml and *.html files.

List of software applications associated to the .oo3 file extension

Recommended software programs are sorted by OS platform (Windows, macOS, Linux, iOS, Android etc.)
and possible program actions that can be done with the file: like open oo3 file, edit oo3 file, convert oo3 file, view oo3 file, play oo3 file etc. (if exist software for corresponding action in's database).

Click on the tab below to simply browse between the application actions, to quickly get a list of recommended software, which is able to perform the specified software action, such as opening, editing or converting oo3 files.

Software that open oo3 file - OmniOutliner data

Programs supporting the exension oo3 on the main platforms Windows, Mac, Linux or mobile. Click on the link to get more information about OmniOutliner for open oo3 file action.

Apple macOS / Mac OS X:

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