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ProductGapRadar
Find US App Store hits not yet available in Japan.
Discover apps gaining traction in the US that haven't been localized or released in Japan yet. An information hub for indie developers hunting their next opportunity.
Hi PH! 👋 I'm an indie developer based in Japan.
I kept noticing the same thing: apps blowing up in the US App Store that simply don't exist in Japan yet — no localization, no release, nothing. Every one of those felt like an open opportunity just sitting there, but tracking them by hand was painful.
So I built ProductGapRadar. Every day it surfaces US apps gaining traction that haven't landed in Japan yet — a running list of market gaps for indie devs looking for their next thing to build.
I'd love to hear: if you're a builder, what's the last "why doesn't this exist here yet?" moment you had? And for anyone who's localized an app across markets — what worked, what didn't?
Happy to answer any questions 🙏
How do you actually determine traction in the US market, like is it based on downloads, revenue, or some blend of metrics you track?
The US-to-Japan angle is genuinely useful and not something I've seen covered elsewhere. Spent a few minutes browsing and the filter by category helped me spot two apps I'd missed.
Finally a focused lens on the US-to-Japan gap. Scrolling through trending apps that skipped localization gave me three solid leads in under five minutes.
How does it actually flag traction in the US though, just download rank jumps or something deeper like retention or revenue signals?
How do you actually source the traction data, and is it updated daily or more like a weekly snapshot?
How often is the data refreshed, and what sources do you pull from to confirm an app is actually gaining traction rather than just getting a brief spike?
How often does the data refresh, and is it pulling from app store rankings directly or some third-party source? Curious how reliable the traction signals actually are.
About ProductGapRadar on Product Hunt
“Find US App Store hits not yet available in Japan.”
ProductGapRadar was submitted on Product Hunt and earned 4 upvotes and 15 comments, placing #80 on the daily leaderboard. Discover apps gaining traction in the US that haven't been localized or released in Japan yet. An information hub for indie developers hunting their next opportunity.
ProductGapRadar was featured in Web App (122.8k followers), Developer Tools (515.4k followers) and Artificial Intelligence (473.1k followers) on Product Hunt. Together, these topics include over 216.3k products, making this a competitive space to launch in.
Who hunted ProductGapRadar?
ProductGapRadar was hunted by Ont4Mqz WorkBase. 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.
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