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

About the company

The core activity of CELSI AG is the development and implementation of software solutions with a focus on security, particularly in the areas of Smart Grid, Smart Metering and payment solutions. This also includes specific solutions such as ep2 eft/pos, CEPTEST and CelsiGuard. The company offers its customers comprehensive services, from needs analysis to the implementation of software projects, and positions itself as a software partner for companies in the energy sector and other industries that require secure connections and solutions.

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Offering

Products & services

Industry:Software Development
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Celsi AG

✓ Offered9
Software development
Software solutions for Smart Grid, Smart Metering and payment solutions; complete software development projects with requirements analysis, design, prototyping and implementation.
Smart Grid / Smart Metering software solutions
Software solutions for Smart Grid and Smart Metering; configuration, administration and operation of smart meter gateways, secure communication, key and certificate management, reporting.
Payment solutions
Integration of payment solutions with ep2 eft/pos; test and monitoring tools, ep2 communication library, server monitoring, invoicing with credit card payments.
CEPTEST ep2 developer test tool
Test tool for creating, analyzing and displaying ep2 message structures and messages; simulates components and communication protocols with and without security headers.
Celsi ep2 monitor
Browser-based monitor for ep2 data streams; shows authorisations, reversals, runtimes, success and error cases, as well as performance data.
CELSI ep2 Starter Kit
ep2 Java communication library for client and server projects; handles encoding, encryption, header information and message exchange.
CELSI ep2 watchdog
Monitoring of ep2 servers with alerting in case of malfunctions; can be used as a standalone solution or integrated into Nagios.
CELSI SIP
Invoicing software with credit card payments; creates quotations, delivery notes and invoices, and supports Secure Internet Payment.
CelsiGuard
Java framework for secure communication between client and server; encryption and decryption of messages and documents using RSA and Triple-DES.
Trust & reputation

ranQ Trust Score of Celsi 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.

Celsi 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%
Celsi AG scores 89.3 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.70.07%
Celsi AG 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%
Celsi AG scores 8.6 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 35.8.64%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Celsi 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.

Knowledge

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Location

Bäckerweg 2
9240 Uzwil
Opening hours
Mon
08:00 - 18:00
Tue
08:00 - 18:00
Wed
08:00 - 18:00
Thu
08:00 - 18:00
Fri
08:00 - 18:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-108.157.717
Founded
1983 · 43 years
Last commercial register change
May 17, 2022
Employees
11 to 20
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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