Which is the better buy? Side-by-side on rating, price, strengths, and watch-outs — with the published ratings we averaged to get there.
TOTO Washlet S5 comes out ahead by a clear margin (4.4 vs 4.8). The gap is mostly about households committed to a full bidet upgrade with multiple users — read the strengths below before deciding.
The SimpleSpa Thinline is the entry-level pick — Brondell's bare-bones cold-water attachment at $35. Best for first-time bidet shoppers testing the concept.
The Washlet S5 is the best-overall pick — TOTO's flagship with tankless warm water and 4 user presets.
Cheapest pick. Aggressive spray. Cold only.
Best overall. Most premium. Tankless heat unique here.
| Spec | Brondell SimpleSpa Thinline | TOTO Washlet S5 |
|---|---|---|
| Type | Under-seat attachment | Replacement seat |
| Power | None | — |
| Install | 5 minutes | — |
| Spray | Cold water | — |
| Warm Water | — | Tankless instant |
| Presets | — | 4 user |
| Heat + Dry | — | Yes |