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Porthole
Finally see what AI made.
Every time an AI hands you amd orhtml file, you need somewhere to open it. Porthole is that app. Lightweight viewer + editor for Markdown and HTML — GitHub-flavored rendering, syntax highlighting, live split-view preview. Set it as your default and AI-generated files route there automatically. Free, open source. macOS + Windows. Note: macOS will show a security prompt on first launch — right-click and select Open.
Top comment
Hey PH - I'm Kuran, I built this. It started as a personal project because every AI tool I use generates markdown or HTML files and there was no great default app to open them on macOS or Windows. Happy to answer questions and also very open to feedback on what's missing — file history, export to PDF, and a URI scheme handler (porthole://) are already on the roadmap.
About Porthole on Product Hunt
“Finally see what AI made.”
Porthole was submitted on Product Hunt and earned 0 upvotes and 1 comments, placing #47 on the daily leaderboard. Every time an AI hands you amd orhtml file, you need somewhere to open it. Porthole is that app. Lightweight viewer + editor for Markdown and HTML — GitHub-flavored rendering, syntax highlighting, live split-view preview. Set it as your default and AI-generated files route there automatically. Free, open source. macOS + Windows. Note: macOS will show a security prompt on first launch — right-click and select Open.
On the analytics side, Porthole competes within Productivity, Open Source and Developer Tools — topics that collectively have 1.2M followers on Product Hunt. The dashboard above tracks how Porthole performed against the three products that launched closest to it on the same day.
Who hunted Porthole?
Porthole was hunted by kuran malhotra. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of Porthole including community comment highlights and product details, visit the product overview.