"Japanese toilets" in the US market generally refers to TOTO Neorest and Inax models — integrated smart toilets with built-in Washlet bidet seats that originated in Japanese residential plumbing in the 1980s and became ubiquitous across Japan by 2000. The defining features: heated seat, integrated bidet with adjustable water temperature/position/pressure, auto-flush sensors, auto-open/close lids, deodorizer fans, and (in the premium tier) UV sanitization between flushes.
TOTO is the dominant Japanese brand in US distribution with full warranty service. Inax (also Japanese, owned by LIXIL Group which also owns American Standard) has limited US presence and parts availability — for US installation, TOTO is the safer brand choice. Panasonic and other Japanese brands occasionally appear in US specifications but generally lack established service networks.
The cost reality for Japanese smart toilets: TOTO Neorest 700H is $3,999, Neorest 750H is $5,999, and the top-tier Neorest NX1/NX2 reach $8,000–$10,000+. Adding the Washlet to an existing toilet (TOTO Washlet S550e bidet seat, $1,099–$1,499) gets you 70% of the Japanese toilet experience for one-third the cost — the toilet bowl itself doesn't need to be Japanese, just the seat.
For first-time buyers wanting the authentic Japanese toilet experience without committing $5,000+, our recommended approach is: install a quality comfort-height toilet (TOTO Drake or Kohler Cimarron, $329–$499) and add a TOTO Washlet S550e bidet seat ($1,499). Total cost: $1,800–$2,000 for 80% of the Neorest experience. If you decide you love it, upgrading to a full Neorest later costs you the price of an additional toilet but you already know the Washlet half is worth it.