F
FileRouter
A default handler for multiple file types that never opens anything itself, routing files to the right editor based on your rules.
macOS utilityOne-time purchase $19.997-day free trialAvailable on SetappMac App Store
Opportunity score
52/100
FileRouter is an elegant niche utility with low revenue ceiling but strong retention and easy solo development for the right founder.
Founder verdict
MAYBE
FileRouter is a well-built niche Mac utility whose success depends on creator distribution and Setapp, not scalable standalone economics.
What is FileRouter?
FileRouter is a native macOS utility that acts as a rule-based default file handler. Instead of opening files itself, it routes double-clicked files to user-defined apps based on file type, folder, or priority lists. It is built by well-known Mac automation developer Brett Terpstra, priced as a one-time $19.99 purchase after a 7-day trial, and distributed through the Mac App Store and Setapp. The product targets macOS power users who need different apps for the same file type depending on context, essentially bringing Velja/Choosy-style URL routing to files.
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The complete reverse-engineering — what to copy, what to avoid, and exactly what to build instead.
- Full opportunity score across 8 dimensions
- The real problem & why customers pay
- Why it's winning — with evidence
- Complete business reverse-engineering
- Competitive advantages & moat analysis
- Weaknesses, risks & what to avoid
- Clone strategy — what to build instead
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- Founder verdict & highest-leverage move