Grammarly AI Detector Review: Features, Limits and Alternatives
Explore Grammarly AI Detector for AI checking within an editing ecosystem. See what it offers, what to verify and when TextUnbot is an alternative.
Quick answer
Grammarly documents AI checking in several editing surfaces, with access depending on plan and environment. Its support guide describes a percentage estimate and warns against treating it as a definitive result. Grammarly’s user guide says the detector does not explain why text was flagged. Do not assume every highlighted passage includes a causal explanation or a safe rewrite.
Overview
What is Grammarly AI Detector?
A correction, a generated rewrite and a record of how text entered a document are different kinds of assistance and evidence. Decide which question you are asking before opening a detector. If the goal is transparency about your process, preserve that process instead of trying to obtain a preferred percentage.
Sources reviewed September 27, 2026: Grammarly: AI Detector user guide. Grammarly: Introducing Authorship.
Product tour
Key Grammarly AI Detector features
Integrated access
Availability varies by plan and surface.
Percentage estimate
A screening result rather than proof.
Separate authorship tools
Process tracking and detector predictions are different functions.
Side-by-side
Grammarly AI Detector vs. TextUnbot
Both products can be useful, but they optimize for different jobs. Written by TextUnbot, this is a publisher-authored workflow comparison, not an independent accuracy benchmark. Features may change after the source review date.
Before comparing results, read how to evaluate AI detector accuracy and what detector scores actually mean. For the complete review workflow, see our AI detection guide.
| Capability | TextUnbot | Grammarly AI Detector | Decision criterion |
|---|---|---|---|
| Main workflow | Dedicated writing-tool pages | Checking inside supported editing surfaces | Verify access |
| Humanization | Dedicated tool | Generative rewriting also exists in the ecosystem | Follow applicable rules |
| Interpretation | Contextual review required | Contextual review required | No guaranteed cross-detector result |
What to test before choosing Grammarly AI Detector
Check the exact surface you use—such as a supported document editor—before subscribing for detection. If your concern is an academic rule, distinguish grammar corrections from generative rewriting and read the applicable policy. Preserve the original before making changes. A different detector may produce a different result on the same submission.
Suggested evaluation, not a test we performed. Use our humanizer comparison rubric or detector evaluation checklist to record your results.
Plan limits, cost and privacy: what to verify
Confirm the current plan’s input length, usage allowance and whether repeated scans or rewrites consume more credits. A free test is not evidence that your full workload is included.
Check renewal terms, cancellation, billing period and the features included in the exact plan. We do not quote a price here because promotions, regions and product bundles can change.
Before uploading private material, review the provider’s retention, training-use and deletion policies. A feature review is not a privacy or security audit.
Decision guide
Which tool should you choose?
Choose Grammarly AI Detector when…
You already work in a supported Grammarly editing surface and have verified detector access.
Choose TextUnbot when…
Your main task is rewriting an existing draft, and you prefer direct access to TextUnbot’s humanizer, detector, essay writer and citation pages. This is a workflow preference, not a claim of superior accuracy or guaranteed savings.
Try TextUnbot freeBottom line
Final verdict
Consider Grammarly if checking inside your existing editor is useful. Consider TextUnbot if you prefer a separate, dedicated humanization workflow. Neither tool’s rewrite should be treated as evidence that a disputed original was human-written.
Common questions
Grammarly AI Detector FAQ
Does Grammarly explain why every passage is flagged?
Its AI Detector user guide says it does not explain why text may be flagged. Highlights and percentage estimates should not be mistaken for a verified account of how a passage was written.
Is this a hands-on performance test?
No. This is a TextUnbot-authored review of official product information and workflow fit. We have not run a controlled accuracy, rewrite-quality or speed benchmark for this comparison.
What should I compare before paying?
Use the same permitted sample and record the plan, mode, input limit, manual corrections and total attempts needed. Review privacy and renewal terms separately.
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