Kage: Website Offline Archiver

Shadow any website into a single downloadable binary for offline viewing. Useful for archiving knowledge, working without internet, or preserving content. Target: researchers, offline-first developers, and knowledge workers.

HTTrack and wget --mirror have solved the core technical problem for decades, and the Wayback Machine handles preservation for most archiving use cases, so the differentiation here has to come entirely from UX and the "single binary" packaging angle. With growing interest in local-first software and offline-first workflows — driven partly by AI tooling that runs on-device — there's a real but niche audience who would pay for a polished, no-dependency solution. The $300–1.5k/mo revenue band is honest: this is a one-time-purchase or low-ticket tool at best, and subscription justification is hard when free CLI alternatives exist. The most likely failure mode is that the target users are technical enough to just use the free tools, leaving too small a wedge of non-technical buyers to sustain even modest revenue.