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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,765 companies indexed · Last updated: today
DirectoryArts, Culture & RecreationWellness & SPA FacilitiesZurichTonttu GmbH
Tonttu GmbH Logo
Verified· 3 sourcesTrust Score
Summary

About the company

The company Tonttu, GmbH, operates a lake bath with various offers in the areas of wellness, recreation and leisure. The core activities include: lake bathing operations, sauna offers, gastronomy, rental of rooms for events, wellness offers such as massage, hair and scalp care, natural cosmetics, sugaring, facial and Gua Sha treatments, as well as sports and fitness offers such as boot camp, swimming training, sup-yoga and yoga. Thus, the company offers a comprehensive range of services for recreation, wellness and leisure.

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Offering

Products & services

Industry:Wellness & SPA Facilities
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4.1/5

Tonttu GmbH

✓ Offered11
Bath
Mixed bathing area and women’s bath with direct lake access, outdoor flippers, swimming lanes, non-swimmer pool, diving board, and rental of bath towels, swimsuits and locker locks.
Sauna
Summer sauna with two mixed sauna cabins, relaxation room, open-air area with direct lake access, non-swimmer pool, cold-water shower, as well as kiosk, massage and energy work.
Massage
Massages daily from 11:00 to 19:00, and Thursdays until 20:00; bookable online, with various therapists and a range of massages including classic, sports, LomiLomi, foot reflexology areas and others.
Energy work
Energy work on Mondays from 11:00 to 20:00, bookable online or on site; 30- and 50-minute appointments with binding confirmation, paid in cash or via TWINT.
SUP / SUP yoga
Rental of SUP boards including paddle, leash and life jacket, plus SUP yoga classes and private lessons on the water, sometimes with set lesson times and group prices.
Yoga
Yoga classes during the summer season with Theresa Moser as well as Clive Radda & Friends, including morning and evening sessions, full moon yoga and subscription prices.
Swimming training
Guided swimming lessons in the lake for lake lovers and ambitious sportspeople, with a focus on technique, safety and conditioning, with group and private lessons.
Boot Camp
Intensive full-body workout at Seebad Enge with personal trainer Arne Ramholt, from April until the end of the season every Wednesday and Friday morning.
Gastronomy
Bar and self-service restaurant with breakfast, light summer kitchen, drinks and coffee; plus reservations for groups, moules et frites and aperitif offers.
Rental
Exclusive rental of the women’s side for occasions such as birthday parties, weddings and company celebrations; reservations and catering for groups and events.
Vouchers
Vouchers for all services and offers of the Seebad, available on site or orderable online, with postal delivery and payment via PayPal, credit card or Twint.
Trust & reputation

ranQ Trust Score of Tonttu GmbH: 4.1 out of 5.0

Trust Score4.1/ 5.0

High

x

Data basis 58% · As of October 2026

Without public customer reviews the score stays capped.

Tonttu GmbH has no value in the Reputation area of the ranQ Trust Score because no data is available. The area carries 42% of the weighting and drops out of the calculation for this profile; it does not lower the score, only the reported data basis.
x
CriterionValueWeight
  • Review quality: No data point — the criterion is taken out of the weighting and does not lower the score.—24%
  • Review volume: No data point — the criterion is taken out of the weighting and does not lower the score.—10%
  • Review recency: No data point — the criterion is taken out of the weighting and does not lower the score.—8%
Tonttu GmbH scores 89.7 out of 100 points in the Substance area of the ranQ Trust Score. This area carries 28% of the weighting.
x
CriterionValueWeight
  • Establishment: Years since founding or brand launch, logarithmic. The maximum is reached at 15 years.100.012%
  • Company size: The headcount band, researched by ranQ or stated by the company. It is scored in steps rather than by head count, because the data only provides bands.82.07%
Tonttu GmbH scores 85.0 out of 100 points in the Identity area of the ranQ Trust Score. This area carries 22% of the weighting.
x
CriterionValueWeight
  • Verification: Official register entry (commercial register with UID or professional-body record, 55 points), confirmed domain (20 points) and confirmed ranQ profile (up to 25 points, depending on completeness).85.022%
Tonttu GmbH scores 50.0 out of 100 points in the Visibility area of the ranQ Trust Score. This area carries 8% of the weighting.
x
CriterionValueWeight
  • Website authority: Ahrefs' Domain Rating measures, on a scale of 0 to 100, how strongly a website is linked from other websites. For Swiss SMEs the range up to 40 is typical; the maximum is reached at 35.100.04%
  • Media authority: Quality and number of editorial mentions, weighted by the importance of the source, plus the recency of the latest high-quality mention.0.04%
Qualifications+0.00

Tonttu GmbH reaches a ranQ Trust Score of 4.1 out of 5.0 — rated «High». No public customer reviews are available for this provider; the rating is based on the remaining criteria. The data basis is 58%, so the score is backed by part of the criteria. As of October 2026.

The Trust Score cannot be bought and is calculated from publicly verifiable data.

Press

Media

November 22, 2025Media
Neuer Wind in der Sauna am See in Uster
zo-online.ch

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Location

Mythenquai 9
8002 Zurich

At a glance

Legal form
Limited Liability Company
UID
CHE-103.232.731
Founded
2001 · 25 years
Last commercial register change
December 9, 2020
Employees
21 to 50
Legal form: Graded by liability and disclosure. The weight is kept small: a sole proprietorship is not a dubious company, it is just liable differently.
88.0
6%
  • Branch offices: Branch offices linked in the commercial register. Having none is normal and costs no points.70.03%
    • Full methodology

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