Observed arrival · 2026-11-14
Shelfie: the book-cover thumbnail test
A browser-based tool for previewing a book cover beside up to 11 competitors at approximate store-thumbnail sizes.
○Open
⊠Login
$Paid
†Ads
✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
- For
- Independent book-cover designers and self-publishing authors
- Worth noticing
- The store-size presets are approximate; users can adjust the height slider to match their own screen.
Field notes
Shelfie’s controls separate the cover being tested from up to 11 comparison covers, with store-light and store-dark views plus grayscale and squint modes. Its interface describes contrast, title-legibility, and stand-out scores as quick pixel heuristics, and cautions that store-size presets are approximate. The page says files remain in the browser tab; its lineup export includes competitors’ covers, while the share card excludes them.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
$PaidCommerce or pricing visible
✦PrettyNotable craft visible
●ProPolished or operationally mature
◎NicheUnusually specific use
One card from the complete issue