Guardio has a good data management policy, though it isn’t exactly no-logs. Before recommending Guardio, I combed through its privacy policy to make sure it had responsible policies.
Guardio won’t sell your information to any third-party sources, but it will collect data that it deems important to provide its services and metadata for how users found the product. Guardio can also send you marketing materials, but you can opt out of that at any time. Overall, it’s not a perfect data management policy, but it’s fully GDPR-compliant and your data won’t be sold to a third party.