CLEARSY
The CLEARSY company
CLEARSY was founded on January 1, 2001 by the team of engineers responsible for the industrialisation of the formal modelling tool called Atelier B, used in the railway sector to produce safety software.
CLEARSY: safety systems engineering
We are a French SME, specialised in the realisation of safety systems and software from level SIL1 to SIL4. We develop complex systems by ensuring their design, their validation, verification and safety study, right up to their commissioning.
CLEARSY produces safe systems and software in the railway, automotive, military, space and nuclear fields.
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News
Training: CLEARSY has once again been awarded Qualiopi certification
5 February 2026 | Company
The Qualiopi quality certification has been awarded by AFNOR to CLEARSY for the following category: Training activities. This recognition enables […]
CLEARSY supervises smoke extraction for the new Line C of the Toulouse Metro.
3 February 2026 | Fire safety
CLEARSY is developing the smoke extraction supervision system for the new Line C of the Toulouse metro. CLEARSY supplies EIFFAGE […]
How can Artificial Intelligence and railway safety be reconciled?
30 January 2026 | R&D
Software safety analyses require knowledge of their algorithms, while Machine Learning (ML) models remain software ‘black boxes’. However, there is […]
CLEARSY secures the ECOTRAIN with its free track detection system
27 January 2026 | ERTMS
Several light rail projects, such as ECOTRAIN unveiled at the end of 2025, are emerging. In this context, CLEARSY is […]
SIL2 safety development of the temporary signalling server (GEST) for ARGOS RBC, obtaining SIL2 certification
21 January 2026 | ERTMS
CLEARSY carried out the safety development with a SIL2 requirement level for the temporary signalling server for Compagnie des signaux […]
CLEARSY is once again equipping line 13 of the French Parisian metro with its platform door control system
15 January 2026 | Metro (CBTC)
As part of the project to automate line 13 of the Paris Metro, RATP has once again commissioned CLEARSY to […]
Safety software and systems
All our security systems and software available below. If you have a specific problem, contact us.
operational systems
