Verdict
Head-to-head · Best Bidet Toilet Seat Attachments

Brondell SimpleSpa Thinline vs TOTO Washlet S5

Which is the better buy? Side-by-side on rating, price, strengths, and watch-outs — with the published ratings we averaged to get there.

The short answer

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.

Brondell SimpleSpa Thinline
Ranked #5 in Best Bidet Toilet Seat Attachments
Brondell SimpleSpa Thinline
$35

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.

Strengths
  • Cheapest pick by a wide margin
  • Easy single-control install
  • Quality Brondell brand
Watch-outs
  • More aggressive spray than other picks
  • Cold water only
  • Single nozzle
TOTO Washlet S5
Higher ratedRanked #1 in Best Bidet Toilet Seat Attachments
TOTO Washlet S5
$1,200

The Washlet S5 is the best-overall pick — TOTO's flagship with tankless warm water and 4 user presets.

Strengths
  • Tankless instant warm water — endless warmth
  • 4 user presets vs C5's 2
  • Self-cleaning wand + air dryer
Watch-outs
  • Premium price — most expensive pick
  • Replaces existing toilet seat
  • Electrical outlet near toilet required

How they stack up

Brondell SimpleSpa Thinline

Cheapest pick. Aggressive spray. Cold only.

TOTO Washlet S5

Best overall. Most premium. Tankless heat unique here.

Specs side-by-side

SpecBrondell SimpleSpa ThinlineTOTO Washlet S5
TypeUnder-seat attachmentReplacement seat
PowerNone
Install5 minutes
SprayCold water
Warm WaterTankless instant
Presets4 user
Heat + DryYes
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