ScanGap
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// about

Built by builders who shipped into closed niches — one too many times.

ScanGap is the fifteen-minute check we wish we’d run before three months of nights and weekends. We built it so you never have to learn that lesson the expensive way.

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// the story

We picked the wrong niche. The build was never the problem.

The first app took three months of nights and weekends. The code was clean, the onboarding was smooth, the landing page converted. Then it launched — into a niche that five tools already owned. Not a niche with room; a niche where every function a new user would search for was already covered, rated, and reviewed by an incumbent.

The painful part wasn’t the work. It was realizing that fifteen minutes of honest looking — before line one of code — would have told us the column was already red. We’d optimized the build and skipped the one decision that mattered more than all of it: which niche to build in at all.

So we started doing that look by hand for every idea: crawl the whole marketplace, list every app, and ask of each function — is anyone winning this, or is it still open? Tedious, but it kept killing dead ideas before they cost us a quarter. ScanGap is that check, made fast and repeatable. It exists for one reason: so a builder picks the open column on purpose, not by accident.

Picking the niche matters more than executing on it. ScanGap makes that one decision something you can get right in 60 seconds.

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Free · no credit card · first niche in 60s
// what we believe

Four principles we won’t bend on

ScanGap only works if you can trust it. These are the rules that keep it honest.

Evidence over opinion

A niche isn’t open because it feels open. Every call comes from real, crawled data — app counts, ratings, review volume, momentum — not a hunch on a podcast.

Judgment, not raw data

A spreadsheet of 240 apps isn’t an answer. We do the reading and hand you a decision: this column is open, that one is taken. Three conclusions, not a data dump.

Honesty, even when it stings

If your niche is closed, we’ll tell you it’s closed. We’d rather lose the signup than send you into three months of work behind five tools that already won.

Show our work

Every verdict links to the actual apps behind it. You never have to trust us — open the listings and check the call yourself. A score you can’t verify is just an opinion.

// how it’s built

A crawler and a formula you can audit

There’s no analyst behind a curtain. ScanGap is a pipeline — boring, repeatable, and inspectable end to end.

01

A crawler maps the whole marketplace

It walks every public app listing in a niche — install counts, ratings, review volume, pricing, last-updated — and re-runs weekly. Nothing sampled, nothing hand-picked.

02

One transparent formula scores each function

Market concentration × rating quality × momentum → Won, Contested or Open. The same explicit calculation runs on every niche. No black box, no vibes.

03

Every cell points back at the evidence

Each verdict links to the real apps behind it, so you can open the listings and check the call. The score is a starting point for your judgment, not a substitute for it.

scangap · scoring 
# every function, same formula
score = concentration × rating × momentum

Open       score < 0.34   → build here
Contested  0.34–0.66      → no clear leader
Won        score > 0.66   → already taken
re-crawled weekly · every cell links to the apps
SG

We’re indie builders ourselves — we still ship side projects, and we still run every one of them through ScanGap first. If it ever tells you a niche is closed, believe it. That honesty is the whole point.

— the ScanGap team
Indie builders, for indie builders

Is your niche still open?

See your niche’s full function matrix in 60 seconds — and find the column nobody’s built yet.

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Free · no credit card · first niche in 60s

60 seconds now, or three months on the wrong build.