Steelkilt is available for macOS and iOS.
Steelkilt Projects can be created, edited and shared by both versions of the app.
Support for Project content — such as Book structure, Book metadata, EPUB compilation settings, text and code — is identical in both versions of the app. Consequently, you have full control of your Project content wherever you choose to work.
Generally, features available in the iOS version of the app mirror those found in the macOS version — except where:
- The feature is not compatible with the iOS user interface
- Certain elements of the feature are not compatible with iOS services
Below is a table that lists the functional differences between the macOS and iOS versions of Steelkilt:
| Feature | macOS | iOS |
| Multiple Books per Project |  | |
| Open multiple Books | | – |
| Project Navigator | | |
| Project Navigator drag and drop | | – |
| Settings for Books, Parts, Documents and Chapters | | |
| Markdown processing in Text Editor | | |
| Markdown commands (Text Menu) | | – |
| Autocompletion menu in Text Editor | | – |
| Text Editor themes | | |
| Custom fonts allowed in Text Editor themes | | – |
| Import plain text files | | |
| Keywords and Tags for Documents and Chapters | | |
| Annotations View | | |
| Annotations in Text Editor | | |
| Search Tool | | |
| Search Text, Tags and Keywords | | |
| Replace Text in one or more files | | |
| Search multiple Books | | – |
| EPUB Code Generator | | |
| Code Navigator | | |
| Code Editor | | |
| Code Editor themes | | |
| Syntax highlighting in Code Editor | | |
| Autocompletion menu in Code Editor | | – |
| Code commands (Code Menu) | | – |
| Settings for Resources | | |
| Import Resources | | |
| Regenerate and revert commands | | |
| EPUB Error Scanner (and EPUB Content Problem repair) | | |
| EPUB export | | |
| PDF export | | |
| Text export | | |
| RTF export | | |
| HTML export | | – |