Observed arrival · 2026-11-05
TANKA turns bulk-buy prices into per-use comparisons
A Japanese comparison site converts Rakuten product prices into costs per use, sheet, weight, or book across everyday shopping categories.
○Open
⊠Login
$Paid
†Ads
✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
- For
- Japanese shoppers comparing bulk household purchases
- Worth noticing
- The page discloses Rakuten affiliate links and says it refreshes automatically at 6 a.m.; it lists 87 categories and 1,570 products.
Field notes
The homepage separates price drops from a ranking of categories where the lowest listed price is below the displayed average. Product costs are normalized using different units, including per-use, per-sheet, per-100-gram, and per-book prices. One visible example lists baby wipes at 1.3 yen per sheet against a 12.6-yen average; the page says the underlying comparisons refresh automatically each morning.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
$PaidCommerce or pricing visible
†AdsAdvertising visible
✦PrettyNotable craft visible
◎NicheUnusually specific use
One card from the complete issue