What is the difference between OEKO-TEX Standard 100 and bluesign?

OEKO-TEX Standard 100 is a product certification; bluesign is a production-system certification.

Standard 100 tests each finished article — fabric, thread, buttons, prints — against a limit-value catalogue for harmful substances, and is issued per product class (Class I for baby articles is the strictest). bluesign audits the entire manufacturing chain: which chemicals go in, how water, energy and emissions are managed at the facility level. In practice, a buyer sourcing waterproof jackets should ask for Standard 100 test certificates on the actual bulk fabric lot, and treat bluesign (or similar chemical-management systems) as evidence that the mill's input chemistry is controlled. One does not replace the other.