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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,629 companies indexed · Last updated: today
DirectoryBusiness & Technical ServicesRental of Consumer GoodsBirmensdorf ZhContrena GmbH
Contrena GmbH Logo
Verified· 3 sourcesTrust Score
Summary

About the company

The core activity of Contrena GmbH is the rental and sale of video and data technology, particularly projectors, screens, displays, audio and microphone technology, as well as the implementation of professional installations and consultations for presentation technology.

AI-generated
Offering

Products & services

Industry:Rental of Consumer GoodsRetail - Electronic Devices
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Contrena GmbH

✓ Offered6
Rental of projectors, projection screens and video technology
Rental for events, presentations, trainings and seminars with projectors, screens, displays, webcam/dokucam/ohp as well as audio and video technology.
Rental of sound equipment and PA systems
Rental of microphone systems, amplifier systems, loudspeakers, mixing consoles and other audio components for events and presentations.
Sale of video and data technology
Sale of projectors, displays, projection screens, projection trolleys, ceiling mounts, projection accessories, projector lamps and microphone technology in the OnlineShop and on request.
Professional installations
Consulting, delivery and installation of projectors, screens and PA systems for meeting rooms, seminar rooms, classrooms as well as municipal and church rooms.
Sale of demo devices
Sale of demo devices from rental inventory or customer returns, as a separate product category next to the OnlineShop.
Gift vouchers
Gift vouchers for purchasing products or services from Contrena.
Trust & reputation

ranQ Trust Score of Contrena GmbH: 4.3 out of 5.0

Trust Score4.3/ 5.0

Very high

x

Data basis 96% · As of October 2026

Contrena GmbH scores 77.0 out of 100 points in the Reputation area of the ranQ Trust Score. This area carries 42% of the weighting.
x
CriterionValueWeight
  • Review quality: The average rating across all connected sources, smoothed against the industry mean. So 5.0 stars from three reviews do not outrank 4.7 from three hundred.73.524%
  • Review volume: The number of reviews across all sources. The scale is logarithmic: the first reviews count the most, and the maximum is reached at 50 reviews.67.110%
  • Review recency: The age of the most recent review. Two-year-old reviews deliberately sit in the middle, because that is normal for Swiss SMEs. Only after three years without a new voice does the value drop markedly.100.08%
Contrena GmbH scores 83.0 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.55.07%
Contrena GmbH scores 83.3 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).83.322%
Contrena GmbH scores 68.6 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 35.68.64%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Contrena GmbH reaches a ranQ Trust Score of 4.3 out of 5.0 — rated «Very high». The rating draws, among other things, on 4.6 out of 5 stars from 13 customer reviews. The data basis is 96%, 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.

Reviews

Aggregated rating

Aggregated rating
4.6
of 5

Aggregated from 13 reviews across all connected sources

Sources
GGoogle4.613
★TrustpilotSoon
PProvenExpertSoon

Further sources are added continuously and factored into the ranQ Rating.

Knowledge

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Location

Breitestrasse 28
8903 Birmensdorf Zh
Opening hours
Mon
13:30 - 17:00
Tue
13:30 - 17:00
Wed
13:30 - 17:00
Thu
13:30 - 17:00
Fri
13:30 - 16:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Limited Liability Company
UID
CHE-111.753.185
Founded
2004 · 22 years
Last commercial register change
January 21, 2009
Employees
1 to 10
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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