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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,701 companies indexed · Last updated: today
DirectoryIT & CommunicationSoftware DevelopmentArlesheim4-check AG
4-check AG Logo
Verified· 2 sourcesTrust Score
Summary

About the company

4-check AG carries out hygiene inspections and technical air‑handling checks according to VDI 6022 and SWKI/VA 104, including measurements and microbiological laboratory analyses via partner labs. The company also provides digital VDI 6022 training (categories A and B) and engineering consulting for the operation and maintenance of HVAC systems. Inspection results and documentation are delivered in digital formats.

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Products & services

Industry:Software Development
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4.1/5

4-check AG

✓ Offered3
Hygiene inspections
Hygiene inspections according to VDI 6022 and SWKI VA 104 for air handling unit (RLT) systems; preliminary discussion, on-site inspection, measurement-based testing, laboratory investigations, evaluation, report, and repeat inspections.
Training courses
Digital hygiene training courses VDI 6022 for categories A and B, including an online learning platform, final exam, certificate, downloads, as well as refresher and multilingual training.
Engineering consulting
Engineering consulting for sustainable, CO₂-neutral and digitised projects; design sprints, rapid prototyping, plant and real-estate analysis, master plans, and modernisation of facility-management concepts.
Trust & reputation

ranQ Trust Score of 4-check AG: 4.1 out of 5.0

Trust Score4.1/ 5.0

High

x

Data basis 54% · As of October 2026

Without public customer reviews the score stays capped.

4-check AG 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%
4-check AG scores 78.3 out of 100 points in the Substance area of the ranQ Trust Score. This area carries 28% of the weighting.
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CriterionValueWeight
  • Establishment: Years since founding or brand launch, logarithmic. The maximum is reached at 15 years.83.012%
  • 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%
4-check AG 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%
4-check AG scores 100.0 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: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

4-check AG 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 54%, 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.

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Location

Bodenweg 12
4144 Arlesheim
Opening hours
Mon
08:00 - 17:00
Tue
08:00 - 17:00
Wed
08:00 - 17:00
Thu
08:00 - 17:00
Fri
08:00 - 17:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-254.185.120
Founded
2017 · 9 years
Last commercial register change
August 5, 2026
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.
100.0
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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