App Store Screenshot Grader
Paste any App Store link. In ~30 seconds you get a 0–100 score for the listing's screenshot design, each line with a concrete fix, benchmarked against the app's own category.
✓
Screenshot count
8 iPhone screenshots
Good — you use the slots Apple gives you.
17/20
✓
Captions
Caption block laid over a full-bleed screen
Overlay pills work (Duolingo does this), but they cover part of the UI and can clash with it — keep the block to one line and a solid brand colour.
16/20
✓
Visual consistency
One background across the set
Reads as one poster when the shots sit side by side.
15/15
✓
Accent colour
Accent #FC840C
A recognisable brand colour repeats across the set — good for recall.
15/15
✗
Accent / background contrast
2.4:1
Below 3:1 the accent disappears in the search-result thumbnail. Darken or lighten the background, or pick a stronger accent.
3/10
✓
iPad screenshots
8 iPad screenshots
iPad users see a set designed for them.
10/10
!
Caption length
Not measured yet
Caption text is read in the browser on the app's showcase page; open it once and come back for this line.
7/10
Against Education (3653 listings analysed): 50% light theme, 31% captions above the phone, 6.1 screenshots on average. Full benchmark →
What gets scored
Seven checks, 100 points, all measured from the public screenshots — no opinions, no AI guesswork:
- Screenshot count (20) — Apple allows 10; most listings stop at 5–6.
- Captions (20) — is there a text band, and is it above the phone where the search crop shows it?
- Visual consistency (15) — one background colour across the set, or a jumble of themes?
- Accent colour (15) — a saturated brand colour that repeats.
- Contrast (10) — WCAG ratio between accent and background, so highlights survive at thumbnail size.
- iPad set (10) — real iPad screenshots instead of stretched phone shots.
- Caption length (10) — 3–6 words read in the thumbnail; longer doesn't.
Every measurement and its limits are documented on the methodology page. Fix anything in the free editor — the "Fix it" button opens it with your listing's own colours already applied.