Grammarly
Vannus records that this vendor states it uses a proprietary model (unnamed). Every finding below is quoted to the vendor’s own document, or marked not disclosed where the vendor publishes nothing.
Writing assistant focused on clarity, grammar and tone
Uses AI; provider not disclosed. Grammarly's generative features demonstrably run on third-party models, and Anthropic, Azure and OpenAI appear in a sub-processor table — but on superhuman.com, a different brand in the same corporate family, not on grammarly.com. We checked and found no first-party page naming it, so the criterion is excluded from the grade rather than counted against Grammarly. grammarly.com ↗
Applies to: Enterprise-tier accounts, Grammarly Pro and Grammarly Business purchased through Sales, Grammarly for Education — but NOT multi-user accounts bought self-serve on the website
From the vendor support-centre article (Product Improvement and Training Control): “For all Enterprise-tier accounts, Grammarly Pro and Grammarly Business purchased through our Sales team, and all Grammarly for Education accounts, Product Improvement and Training is off by default, meaning we are not using these organizations' content to train our models” support.grammarly.com ↗
Training and retention posture varies by plan. The default-plan row above describes the vendor’s free or standard tier; the paid-plan row is quoted from the document linked beside it. A negotiated contract can override either. Check your own agreement before relying on this.
This is a separate question from the grade above. The grade measures resilience — whether the tool endures and whether you could leave it. This describes who controls the vendor. A tool can score modestly on one and strongly on the other, and many do.
On U.S. CLOUD Act reach specifically: the statute reaches a provider subject to U.S. jurisdiction over data in its possession, custody or control. Corporate control is a strong indicator of that and it is what we can evidence from published documents — but it is not the whole test. A company founded outside the U.S. can still contract through a U.S. entity or run substantial U.S. operations. Treat this as a starting point for your own review, not a legal determination, and take advice on anything that matters.
Taken from the vendor’s own published material. Vannus does not hold these reports and has not reviewed their scope or dates — ask the vendor for the current report before relying on any of them.
Vannus publishes a nine-dimension trust framework — data sovereignty, training privacy, compliance posture, operational resilience, exit portability, and more. The heaviest criterion asks whether the tool builds its own AI or resells someone else's model; where the vendor discloses it, the grade cites the vendor's own documentation. No paid placements — scoring is walled off from affiliate revenue. See the methodology →