GramProofReview accuracy
Compare factual sentences with retrieved evidence and see the reasoning behind each assessment.
GRAMPROOF WRITING TOOLS
Fact Checker
Follow the evidence behind your writing. Review factual claims, explore source links, and prepare citations in one focused workspace.
Web-backed analysis · Clear explanations · Sources you can review
TXT / DOCX · up to 5 MB
0 / 1,000 words0 / 40 sentences
EVIDENCE OVERVIEW
Check the claims. See the sources.
—Supported / resolved
Potentially FalsePotentially True
Your evidence review starts here
Checking availability…
Checking sends your text to OpenRouter and its model and search providers. Avoid confidential material.
More confidence in every draft
Explore GramProof’s writing toolkit and existing plan previews.
AI-assisted fact checking can miss context or misinterpret evidence. Review the linked sources and use human judgment before relying on a result.
ONE WORKSPACE, MORE PERSPECTIVES
A Complete Suite of Writing Tools
Move from checking claims to refining the way you communicate them.
LOOK BEYOND A CONVINCING SENTENCE
Why Fact Checking Matters
A polished paragraph can still contain an outdated statistic, a misplaced quotation, or a claim that leaves out important context.
GramProof helps you slow down at the right moments: inspect the evidence, understand what remains uncertain, and give readers a path back to the source.
Review your next draftA claim worth checking
What is being asserted? What evidence would establish it?
Trace the source
Compare the wording, date, location, and scope.
Keep the context
Resolve what you can. Leave uncertainty visible.
MORE THAN A TRUE-OR-FALSE LABEL
Make evidence part of your writing process
Reduce misinformation
Pause at contradictions, missing context, and unresolved claims before you share a draft.
Verify the source
Follow original links, inspect excerpts, and decide whether the evidence is relevant and credible.
Prepare citations
Turn retrieved sources into editable citation drafts in four familiar styles.
FROM CLAIM TO CITATION
How GramProof Fact Checker Works
An evidence trail you can inspect at every step.
01
Input Content
Paste a passage or extract text from a TXT or DOCX document.
02
Scan
Run a web-assisted review. Claims without enough evidence remain uncertain.
03
Review Sources
Select a sentence to inspect explanations, source excerpts, and links.
04
Export Citations
Choose a style, copy or download the drafts, then complete any missing details.
BUILT FOR CAREFUL COMMUNICATION
A second look for every kind of writer
Writers & Publishers
Check factual passages before publication, follow primary sources, and keep uncertainty visible to editors.
Teachers & Students
Practice evaluating evidence, discuss the limits of a source, and prepare references for further review.
Agencies & Enterprise
Bring an evidence review to client content and internal communication. Keep confidential material out of public scans.
FIT YOUR WORKFLOW
Review writing where your work begins
The browser workspace is available now. The connections below are planned, not live integrations.
Chrome Extension
Planned integration
Moodle
Planned integration
API
Planned integration
Google Classroom
Planned integration
YOUR NEXT DRAFT, IN THREE STEPS
How to use GramProof
STEP 1
Add your writing
Paste or upload a focused passage. Include enough context to make each claim understandable.
STEP 2
Check Facts
Start your review and wait for the evidence report. You can cancel or edit your text at any time.
STEP 3
Review and refine
Read the explanations, open sources, revise your claims, and export citation drafts.
FLEXIBLE PRICING
Bring more clarity to your writing workflow.
Start with the available fact-check preview and explore GramProof’s existing plan options for your broader toolkit.
A thoughtful check before you publish
Sentence-level evidence review
Source links and explanations
Four citation draft formats
A clear view of unresolved claims
Plan previews only. Upgrading does not currently increase scan limits.STORIES ABOUT THOUGHTFUL WRITING
Confidence starts with a closer look
Illustrative testimonials with placeholder names, not verified customer endorsements.
“I want to see where a claim comes from before I decide it belongs in a published article.”
NE
Nora Ellis
Content editor · placeholder
“Discussing why a source supports a statement is more useful than accepting a label without question.”
MR
Marcus Reed
Educator · placeholder
“Keeping source links beside a draft would make our review conversations easier to follow.”
LM
Leah Morgan
Team writer · placeholder
KNOW WHAT A RESULT CAN TELL YOU
Frequently Asked Questions
Understand the evidence, the limits, and your next step.