PDFOutline

We could not find recent public information about PDFOutline — the search results returned no matches, and the app appears to have minimal web presence. Given that you are running this app on your Intel Mac today, it is important to find out whether Root Rise Technologies is still actively maintaining it and whether a native Apple Silicon build is planned. Contact the developer directly at your earliest opportunity to ask: (1) Is PDFOutline still being developed? (2) Is there a native Apple Silicon (Universal Binary) build available, or is one planned? (3) If not, when do you expect native support to ship? Without clarity, you face a hard deadline: Rosetta 2 will be removed in macOS 28 in September 2028, at which point any Intel-only build simply will not launch. If the developer confirms the app is abandoned or that no native version is coming, you should begin researching alternative PDF outline and bookmarking tools — apps like Preview (built into macOS and natively Apple Silicon), PDFKit-based utilities, or professional PDF editors such as PDF Expert or Adobe Acrobat, depending on your specific workflow needs.