Describe your layout
Enter breakpoints defined, fixed-width components, longest unwrapped text, and nested layout depth.
RESPONSIVE RISK
Responsive Gap
Detects components and layouts likely to break between common screen widths.
- Uses your inputs in a transparent calculation
- Instant result with practical next steps
- No signup required
Planning guidance only. Validate important decisions with customer evidence and your delivery team.
YOUR INPUTS
Build your result
Complete every field. The result updates only when you choose Calculate.
How it works
Get a responsive-gap score
Responsive Gap weighs breakpoint coverage, fixed sizing, text overflow risk, and layout nesting depth.
Fix and re-test
Add breakpoints, switch to fluid sizing, and test in-between widths, then re-check.
Continue learning: Who should approve MVP requirements?
Frequently asked questions
Why test in-between widths, not just breakpoints?
Most layout bugs appear at the widths between your defined breakpoints, not exactly at them — a 3-breakpoint design can still break at 850px.
How many breakpoints do I actually need?
3 (mobile, tablet, desktop) covers most MVPs; add more only where content genuinely needs a different layout at an in-between width.
What counts as a fixed-width component?
Any element sized in hardcoded pixels rather than percentage, flex, or grid units — these are the most common source of horizontal scroll and overflow bugs.
How We Compare
| Feature | MVPHub | Chrome DevTools responsive mode | BrowserStack |
|---|---|---|---|
| Structured breakage-risk scoring | Included | Not included | Not included |
| No setup required | Included | Included | Not included |
| Live cross-device rendering | Not included | Included | Included |
| Free | Included | Included | Not included |
DevTools responsive mode and BrowserStack both show real rendering across devices. Responsive Gap gives a fast structural risk score from your layout's known fragility factors before you have a testable build.
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