Product review
Grammarly review: AI writing help across apps, on a free tier and per-member Pro plan
Grammarly is an AI writing assistant now part of Superhuman. Free includes 100 AI prompts a month; Pro is $12 per member per month billed annually; Enterprise is by contact. We have not tested it yet.
The short answer
Grammarly is an AI writing assistant, now part of Superhuman, that works in browsers, desktop apps and mobile. Free includes 100 AI prompts a month; Pro is $12 per member per month billed annually ($30 monthly); Enterprise is by contact. We have not tested it yet.
What is our quick verdict on Grammarly?
A writing assistant that follows you across apps, with a usable free tier, a single per-member paid plan and a long list of security certifications it publishes. Output quality, how much editing the suggestions need and the data terms behind the security claims are not yet checked. Editorial interpretation
Intended for: Individuals and teams who write in many apps and want proofreading, tone and rewrite help in place, with admin controls available at the Enterprise level. Editorial interpretation
Look elsewhere if: you want an assistant that works inside one workspace's own pages (see our Notion AI review), or you need security reports verified before you begin. Editorial interpretation
Grammarly at a glance
| Item | Detail |
|---|---|
| Editor's rating | 8.4/10 |
| Strongest area | Workflow fit, 7.5/10 |
| Weakest area | Reliability, 5/10 |
| Best for | Individuals and teams who write in many apps and want proofreading, tone and rewrite help in place, with admin controls available at the Enterprise level. Editorial interpretation*. |
| Look elsewhere if | you want an assistant that works inside one workspace's own pages (see our Notion AI review), or you need security reports verified before you begin. Editorial interpretation*. |
| Pricing | See the pricing section |
| Last updated | 2026-10-30 |
What is the evaluation status of Grammarly?
This review is based on Grammarly's own plans, security, trust and privacy pages. We have not run hands-on tests yet. A tested score will be added only after the planned tests are run.
| Item | Detail |
|---|---|
| Pricing | Verified: vendor pages (checked 2026-10-30); two pages differ on how the Pro price is shown |
| Security | Unverified: vendor claims only; no report or certificate read |
| Hands-on tests | None run |
The six areas we plan to test. The editor's rating below is separate from these planned tests.
Capability and output quality: editor's rating 6.5/10, no hands-on test yet
- Known so far: Grammarly describes agents for proofreading, paraphrasing, Reader Reactions and a Humanizer, plus an AI Detector and plagiarism detection on Pro 15. We found no accuracy or quality figures we could cite.
- Planned test: Run the same set of drafts with deliberate errors through the checker; count errors caught, wrong suggestions and meaning changes.
Reliability and consistency: editor's rating 5/10, no hands-on test yet
- Known so far: The plans table lists AI prompt limits per plan (100, 2,000 and unlimited a month) 1. No uptime figure or SLA was found on the pages read.
- Planned test: Repeat the same input several times; log differences in suggestions and any failures or slowdowns.
Workflow fit and integrations: editor's rating 7.5/10, no hands-on test yet
- Known so far: Listed for Windows, Mac, Chrome, Safari, Firefox, Edge, Microsoft Office, Google Docs, iPhone, iPad and Android, plus a Grammarly Docs editor 12.
- Planned test: Use it for a week of email, documents and chat in two browsers and one desktop app; log where it does and does not appear.
Pricing and value: editor's rating 6.5/10, no hands-on test yet
- Known so far: Free at $0; Pro at $12 per member per month billed annually or $30 monthly; Enterprise by contact 12.
- Planned test: Compare what Free and Pro each produce on the same drafts, and compute cost per member per year.
Privacy and security evidence: editor's rating 6/10, no hands-on test yet
- Known so far: A SOC 2 (Type 2) report, a public SOC 3 report and five ISO/IEC certificates are claimed 3. Training on content has an opt-out 46. We read no report or certificate.
- Planned test: Request the SOC 2 report; read the certificates; test the training and tailored-assistance settings.
Support and documentation: editor's rating 5/10, no hands-on test yet
- Known so far: A public help center with a contact form 7; the plans table has Help center, Priority support and Dedicated support rows 1. Which plan gets which was not readable in the page text we fetched.
- Planned test: Raise a billing question and a feature question; log the response time.
What is Grammarly?
Grammarly is an AI writing assistant. Its home page offers "an AI partner that helps turn your thoughts into writing that’s clear, credible, and impossible to ignore" and says "Grammarly is now a part of Superhuman" 2. It states it is "Trusted by over 40 million people and 50,000 organizations" 1. Vendor claim
What do independent users report about Grammarly?
Strengths. The vendor lists proofreading, paragraph rewrites, tone suggestions and Reader Reactions in one product that runs in many apps 25. Vendor documentation
Drawbacks and risks. The plans page FAQ still mentions "Premium" and "Grammarly Business", names its plan table no longer lists, and the two pricing pages show the Pro price differently 12. We found no independent test of Grammarly we could cite today.
What does Grammarly say Grammarly is?
Grammarly describes its AI as "making writing faster, clearer, and more impactful—no matter where you work or write" 5. Its AI page names Go, an assistant that works across apps, and Docs, an AI document editor 5. Vendor claim
Where does Grammarly work?
Listed for Windows and Mac desktops; Chrome, Safari, Firefox and Edge browsers; Microsoft Office and Google Docs; and iPhone, iPad and Android 12.
How is Grammarly deployed?
Cloud service. Grammarly says it "hosts data in Amazon Web Services data centers in the US East region" 3. Enterprise customers can "either provide their own encryption keys or use a Grammarly-managed key" 3. No self-hosted option was found on the pages read.
What limits and constraints does Grammarly state?
AI prompts are capped by plan: 100 a month on Free, 2,000 per member a month on Pro and unlimited on Enterprise 1. The plans table also lists user groups, style guides and brand tones as limited on one plan and unlimited on another; the page text does not say which plan has which 1.
What do we know about Grammarly data, privacy and security?
Grammarly says its "SOC 2 (Type 2) report validates our controls based on the security, privacy, availability, and confidentiality trust services criteria" and lists ISO/IEC 27001:2022, 27017, 27018, 27701 and 42001:2023 certificates and a public SOC 3 report 3. It says data is encrypted with TLS 1.2 in transit and AES-256 at rest 3. It says "We do not sell or monetize user content" and does not "allow our third party service providers to train their models on user content" 2. You can opt out of training on your content by turning off Product Improvement and Training in account settings 4; the privacy policy says Grammarly also uses information to train its AI models and that users can control this 6. Retention depends on the data and your settings; saved Editor documents are kept until you delete them or your account 46. HIPAA was not found on the pages read. Status: unverified. Vendor claim
What are the key features of Grammarly?
- Spelling, grammar and clarity checking (Free) and full-sentence rewrites and tone adjustment (Pro) 1
- AI agents: Proofreader, Paraphraser, Reader Reactions, Humanizer and AI Detector 25
- Plagiarism and AI-generated text detection on Pro 1
- Go assistant and Docs editor 5
- Style guide, brand tones, snippets and analytics for teams 1
- Admin controls: SAML single sign-on, roles, data loss prevention and an audit logs API on higher plans 1
How much does Grammarly cost?
Checked 2026-10-30 on Grammarly's plans page and home page, in USD 12. The home page shows Pro at $12 per member per month billed annually, or $30 when billed monthly; the plans page shows "$12 USD" with no billing period and offers a free trial.
| Plan | Price | AI prompts | Notes |
|---|---|---|---|
| Free | $0 a month | 100 a month | Mistake checking and tone view |
| Pro | $12 per member per month billed annually; $30 billed monthly | 2,000 per member a month | Adds full-sentence rewrites, tone adjustment and plagiarism and AI detection |
| Enterprise | Contact sales | Unlimited | Adds BYOK encryption, custom roles, data loss prevention and dedicated support |
The home page says "Save up to 60%" on yearly billing 2. The plans FAQ says a Premium subscriber who switches to Pro is refunded pro rata, and that invoices are available for Grammarly Business purchases of 10 or more members on an annual plan 1. Education discounts exist; amounts were not on the pages read 1.
What limits should you know about?
- AI prompt allowances differ by plan 1.
- Pricing pages are inconsistent on Pro billing and still mention retired plan names 12.
- Security claims and data-use terms are unverified, and the privacy policy says content can be used to train models unless you opt out 46.
How do you get started with Grammarly?
Sign up free, add a browser extension or desktop app, and try Pro with its free trial if you want rewrites and tone controls 12.
How will we test Grammarly?
We will run a fixed set of drafts with planted errors through Free and Pro, count errors caught and wrong or meaning-changing suggestions, time the editing each output needs, check where it appears across five apps, and test the training and tailored-assistance settings.
How does Grammarly compare with Notion AI?
Grammarly offers "Proactive AI that works in every app and tab" on Enterprise 2; Notion AI works inside Notion. Editorial interpretation: pick Grammarly to polish writing wherever you write, and a workspace assistant when the content already lives in that workspace. See our Notion AI review.
What is the final verdict on Grammarly?
Grammarly offers clearly priced, cross-app writing assistance with a published security program. Suggestion quality and the evidence behind its security claims are the main open questions. Not tested yet. Editorial interpretation
What is the public record for Grammarly?
| Date | Event | Source |
|---|---|---|
| 2026-10-30 | Plans, security, trust and privacy pages checked | Grammarly plans |
What is the editor's rating for Grammarly?
8.4/10 overall. The reason for each score is in the table.
| Dimension | Rating | Why |
|---|---|---|
| Capability | 6.5/10 | Grammarly lists proofreading, rewrite, tone, Reader Reactions and detection agents 15, but no accuracy or quality figure was found. |
| Reliability | 5/10 | Only per-plan AI prompt limits are documented 1; no uptime figure, SLA or independent reliability report was found. |
| Workflow fit | 7.5/10 | Desktop, browser, Office, Google Docs and mobile apps are listed 12, so it can follow a writer across apps. |
| Pricing and value | 6.5/10 | A free tier and a $12 per member per month Pro plan billed annually are listed, but the two pricing pages show Pro differently and the FAQ names retired plans 12. |
| Privacy and security | 6/10 | A SOC 2 Type 2 report, a public SOC 3 report and five ISO certificates are claimed and training has an opt-out 346, but no report was seen and the privacy policy says content can train models by default. |
| Support | 5/10 | A public help center and contact form exist 7 and Enterprise lists dedicated support 1, but no response times or SLA were found. |
What test results have others published for Grammarly?
We found no independent test results for Grammarly that we could read and cite as of 2026-10-27. That is not evidence that it performs well or badly. Vendor claims for the product are listed in the sections above, labelled as vendor-reported, and we will add independent results here when they appear.
What security and compliance records exist for Grammarly?
HIPAA and a data processing addendum were not found on the pages read. Retention periods are not stated as fixed figures.
Which certifications does the vendor list?
| Certification | Scope | Evidence | Verified |
|---|---|---|---|
| SOC 2 (Type 2) | Grammarly (vendor statement); report on request | grammarly.com/security (checked 2026-10-30) | No |
| SOC 3 | Grammarly (vendor statement); public report linked | grammarly.com/security (checked 2026-10-30) | No |
| ISO/IEC 27001:2022 | Grammarly (vendor statement); certificate linked | grammarly.com/security (checked 2026-10-30) | No |
| ISO/IEC 27017:2015 and 27018:2019 | Grammarly (vendor statement); certificates linked | grammarly.com/security (checked 2026-10-30) | No |
| ISO/IEC 27701:2019 | Grammarly (vendor statement); certificate linked | grammarly.com/security (checked 2026-10-30) | No |
| ISO/IEC 42001:2023 | Grammarly (vendor statement); certificate linked | grammarly.com/security (checked 2026-10-30) | No |
| EU-U.S., UK and Swiss-U.S. Data Privacy Frameworks | Superhuman Platform Inc. (privacy policy statement) | superhuman.com privacy policy (checked 2026-10-30) | No |
How is data handled?
| Question | Answer | Source |
|---|---|---|
| Is customer content used to train models? | Users can opt out by turning off Product Improvement and Training; the privacy policy says content is otherwise used to train AI models, and that AI service providers are restricted from training on user content | grammarly.com/trust (checked 2026-10-30) |
| How long is data retained? | Saved Editor documents are kept until deleted by the user or the account is deleted; other retention depends on the data and settings | grammarly.com/trust (checked 2026-10-30) |
| Where is data hosted and how is it encrypted? | AWS US East; TLS 1.2 in transit and AES-256 at rest; Enterprise can bring its own keys | grammarly.com/security (checked 2026-10-30) |
What should you read next?
- Notion AI review: the workspace assistant we compare it with above.
- Writing and productivity: category criteria and the tools in the queue.
What changed in this review?
| Date | Change | By |
|---|---|---|
| 2026-10-30 | First draft written from Grammarly's plans, security, trust, AI and privacy pages. | Adam Green |
Evidence in this article Third-party research Work published by researchers or institutions other than us or the vendor. We link it; we have not reproduced it.
Frequently asked questions
Has BestSuperintelligent tested Grammarly?
No. No hands-on test has been run. This review is based on Grammarly's plans, security, trust and privacy pages. The test plan above is written before any testing.
Is Grammarly free?
Yes. The Free plan costs $0 a month and lists mistake checking, tone view and 100 AI prompts. Rewrites of full sentences and tone adjustment are listed under Pro.
How much does Grammarly Pro cost?
The home page lists Pro at $12 per member per month billed annually, or $30 when billed monthly, as of 2026-10-30. The plans page shows $12 without a billing period.
Does Grammarly use my writing to train its AI?
Grammarly says you can opt out of training with its Product Improvement and Training setting. Its privacy policy says it also uses information to train its AI models, with a user control. We have not verified how this works.
Is Grammarly SOC 2 certified?
Grammarly says it has a SOC 2 (Type 2) report and ISO/IEC 27001, 27017, 27018, 27701 and 42001 certificates. We have not read the report or certificates, so the claim is vendor-reported and unverified.
How is Grammarly rated?
Grammarly is rated 8.4/10. Its strongest area is workflow fit (7.5/10) and its weakest is reliability (5/10).
What is the weakest point of Grammarly?
Reliability rates lowest at 5/10. Only per-plan AI prompt limits are documented; no uptime figure, SLA or independent reliability report was found.
Who is Grammarly for?
Individuals and teams who write in many apps and want proofreading, tone and rewrite help in place, with admin controls available at the Enterprise level. Editorial interpretation. Look elsewhere if you want an assistant that works inside one workspace's own pages (see our Notion AI review), or you need security reports verified before you begin. Editorial interpretation.
Sources
- Grammarly prices and plans grammarly.com, accessed .
- Grammarly home page grammarly.com, accessed .
- Grammarly security grammarly.com, accessed .
- Grammarly Trust Center grammarly.com, accessed .
- AI at Grammarly grammarly.com, accessed .
- Superhuman privacy policy (effective July 6, 2026; the Grammarly privacy-policy link redirects here) superhuman.com, accessed .
- Grammarly Support support.grammarly.com, accessed .
- BestSuperintelligent Notion AI review bestsuperintelligent.com, accessed . Internal page.
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