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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,887 companies indexed · Last updated: today
DirectoryBusiness & Technical ServicesTechnical Consulting & EngineeringMarbach SgKonstruktionsbüro Sieber GmbH
Konstruktionsbüro Sieber GmbH Logo
Verified· 3 sourcesTrust Score
Summary

About the company

Konstruktionsbüro Sieber GmbH provides design and development services focused on injection-mould tooling, product development and FEM simulation. Its services include project planning, prototype procurement and evaluation, tool optimization and solutions for industries such as furniture, automotive, medical devices, food and construction.

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Products & services

Industry:Technical Consulting & Engineering
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3.8/5

Konstruktionsbüro Sieber GmbH

✓ Offered4
Injection mould tools
Injection mould tools for small series, multi-cavity and high-performance tools; complex multi-component tools with internal movements, core pulls and overmoulding of glass and metal, including tool optimisation.
Product development
Product development with variant studies, new component development, optimisation of existing products, procurement and evaluation of prototypes, rendering images and structural analyses with FEA.
Project planning
Project planning with requirements analysis, advice on key functions, work according to standards, coordination of interfaces and regular exchange.
FEA simulation
FEA simulations to model filling behaviour, trapped air, sink marks, packing and cooling times, distortion calculations, fibre orientation and gate balancing.
Trust & reputation

ranQ Trust Score of Konstruktionsbüro Sieber GmbH: 3.8 out of 5.0

Trust Score3.8/ 5.0

High

x

Data basis 96% · As of October 2026

Konstruktionsbüro Sieber GmbH scores 49.8 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.68.224%
  • 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.17.610%
  • 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.35.08%
Konstruktionsbüro Sieber 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%
Konstruktionsbüro Sieber GmbH scores 85.0 out of 100 points in the Identity area of the ranQ Trust Score. This area carries 22% of the weighting.
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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%
Konstruktionsbüro Sieber GmbH scores 3.4 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 35.3.44%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Konstruktionsbüro Sieber GmbH reaches a ranQ Trust Score of 3.8 out of 5.0 — rated «High». The rating draws, among other things, on 5.0 out of 5 stars from 1 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
5
of 5

Aggregated from 1 reviews across all connected sources

Sources
GGoogle51
★TrustpilotSoon
PProvenExpertSoon

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

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Location

Staatsstrasse 62a
9437 Marbach Sg

At a glance

Legal form
Limited Liability Company
UID
CHE-109.878.541
Founded
2003 · 23 years
Last commercial register change
August 15, 2022
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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