Alternatívák - Certopus

Credly

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Expiration Reminder

expirationreminder.net

TruScholar

truscholar.io

Sertifier

sertifier.com

Certifier

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Accredible

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CredSure

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Give My Certificate

givemycertificate.com

Virtualbadge

virtualbadge.io

Accredify

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NetCredential

netcredential.com