Communication & Synthesis
AI writing assistant for grammar, tone, and clarity across browser, desktop, and mobile apps.
From $12 / mo
Visit WebsiteProductivity Engines
AI writing and summarisation built directly into Notion's all-in-one workspace.
From $10 / mo
Visit Website4-P Sovereignty Matrix
Lumen Trust Notes
Grammarly
Text is sent to Grammarly's cloud for analysis; enterprise plans add stronger admin and data controls, but standard use is not local-first (Privacy Low). Free tier plus accessible Premium pricing support Medium parity. Purpose is High—clear productivity value without dark-pattern lock-in for basic writing help. Provenance Low due to closed models. Fine for everyday writing; disable or avoid on highly confidential documents unless enterprise terms and settings meet your bar.
Notion AI
Notion AI processes data on Notion's cloud infrastructure via third-party model providers (OpenAI, Anthropic); there is no self-hosted or local option. Its add-on pricing model is reasonable and its deep integration with existing workflows provides genuine productivity value without dark patterns. Ideal for teams already on Notion, but review Notion's sub-processor data agreements before storing sensitive client information.
Pricing
Grammarly
From $12 / month
Notion AI
From $10 / month
Disclaimer
Scores are based on publicly available information and Lumen's auditing criteria at the time of assessment. They may not reflect recent changes.
This comparison is not a legal or security audit. Read our full disclaimer.