Bring a source
Open Arbitir and sign in or create an account. Paste a passage or enter a public article URL. For a paper, PDF, or social post, copying the text is the simplest way to start.
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Arbitir · Cognitive science applied to critical reading
Spot cognitive bias.
Question weak reasoning.
Does the argument hold up? Arbitir helps you spot possible cognitive bias, misleading framing, and faulty logic in papers, articles, social posts, and AI answers. See what it flags and why—starting with your own text, free.
Free to use. Just sign up. Analyze up to 1,500 words per source, 3 times a day and up to 30 times a month. No credit card or paid plan required.
Try Arbitir without signing up
Bring a passage. See what it flags.
Paste a passage of at least 25 words. Get a real analysis, free—no account or card needed. You can keep using Arbitir with a free account whenever you are ready.
Try one:
Text to analyze
Free demo · No signup · No credit card
Review each finding in context. Report data and limited quotations are retained; Application privacy policy.
How it works
From a source to a closer read.
Before you submit it, cite it, publish it, or pass it on.
Check the reasoning
Select Analyze. Arbitir looks for patterns of cognitive bias, misleading framing, evidence distortion, and faulty logic in the text it can read.
Review, then decide
Read the summary and grouped findings. Check the quoted passages and explanations against the source, then decide what to revise, verify, or question.
A more useful second look
Good writing can still contain weak reasoning.
Arbitir helps you examine how a claim is made, so you can decide what deserves your confidence.
Find the leap in the argument
A confident conclusion can outrun its evidence. Look for cases where a single example becomes a sweeping claim, or a correlation is presented as a cause.
Notice how the wording steers you
Personal attacks, loaded framing, and appeals to popularity can make a claim feel stronger than it is. Get specific findings you can examine in context.
Know where to read more closely
Severity labels and plain-language explanations help you focus your next pass. The report gives you passages to inspect, rather than leaving you with an unexplained label.
Inside a report
See the claim.
See the problem.
In a live test, we submitted a 133-word fictional passage about a school committee considering a later start time. Arbitir returned nine findings across four groups. Here is one of them.
The example shows a result from that test, not a promise that every analysis will produce the same findings. Review the full context before accepting a flag.
Learn how to read your reportOne case to a sweeping conclusion
Group: Broken logic · Severity: Severe
“Three parents who support the change were interviewed, and all three said their children would learn more. The committee treats these interviews as proof that every family supports the proposal.”
Arbitir’s explanation: A conclusion about universal family support is drawn from a sample of only three pre-selected, supportive respondents, which is far too small and non-representative to support the broad claim.
Your next question: Would a broader, more representative sample support that conclusion?
What you get
A report you can interrogate.
Specific findings make it easier to check the analysis against the source.
- A summary assessmentThe report uses Trust, Caution, or Don’t Trust to summarize detected issues. These labels guide review; they do not certify truth.
- Findings grouped by issueExplore evidence distortion, omissions, framing, broken logic, personal attacks, and evasive or overly agreeable reasoning.
- Severity and explanationsSee why a passage was flagged and how serious the detected issue is judged to be.
- Quoted evidenceInspect the passage associated with a finding and decide whether the explanation fits its context.
- A visible analysis scopeCheck the words analyzed and the report’s count of tactics checked and findings returned.
- Text and public article linksUse the browser app from a computer or phone. Paste text when a source cannot be read from its URL.
Bring the writing you actually use
For the sources you read.
And the work you put your name on.
Student papers
Review a draft before submission. Does the conclusion follow from the evidence, or does it generalize from too few examples?
Use Arbitir for a paperResearch and journal articles
Check a discussion section or research summary before citing it. Look for causal claims, unsupported certainty, and alternatives the argument does not address.
News and newspaper articles
Examine the framing before sharing a story, or review your own article before publication. Separate the reported evidence from the conclusion drawn from it.
Use Arbitir for an articleWebsites and social posts
Paste a public page URL or the text of a post. Check whether a persuasive claim rests on evidence, popularity, or an attack on its critics.
Classroom discussions
Use a passage and its findings to discuss how an argument works. Ask learners to agree or disagree with each flag and explain their reasoning.
Use Arbitir in teachingAI-generated answers
Examine a polished response before reusing it. Look for unsupported assertions and reasoning gaps, then check the original sources yourself.
Simple plans
Start free. Choose more when you need it.
Free
$0 · 3 analyses per day, up to 30 per month.
All you need is a free account. Paste text or check public article links, up to 1,500 words per analysis. No credit card or paid plan required.
Use Arbitir freePro
$3.99 USD per month · 100 analyses per month.
No daily plan cap. Analyze up to 5,000 words and upload supported documents. Billed monthly through Stripe; cancel future renewals from the app.
Choose Pro — $3.99/monthPlatinum
$9.99 USD per month · 300 analyses per month.
Go deeper into longer papers and articles. Analyze up to 10,000 words per analysis, with document uploads and no daily plan cap.
Choose Platinum — $9.99/monthMonthly usage resets on the first of the calendar month (UTC); billing follows your subscription date. Pro includes 100 total uses; Platinum includes 300. Uses already counted that month carry over when changing plans. Technical rate limits apply.
Before you start
Questions worth asking.
Does Arbitir find every cognitive bias?
No tool can guarantee that. Arbitir flags possible cognitive flaws and manipulation tactics expressed in the submitted text. Its current report checks a defined catalog of 25 tactics; that is not a claim to cover every cognitive bias. A finding can be mistaken, and an unflagged passage can still contain problems.
What kinds of sources can I check?
Written passages from student papers, research and journal articles, websites, social media posts, newspaper articles, news stories, and AI answers. Paste the text or use a public article URL. Arbitir analyzes the submitted or extracted text, not an entire website, a person's beliefs, or the underlying research data.
Can I upload a PDF or check a paywalled article?
Document upload is restricted by account entitlement and is not included in the free plan. You can paste text you have permission to use. Some paywalled, sign-in-only, and dynamically loaded pages cannot be extracted from a URL; paste the relevant passage when a link does not work.
Is Arbitir free? Do I need an account?
Yes. Arbitir is free to use with signup: up to 1,500 words per analysis, 3 analyses per day, and 30 per calendar month. No credit card or paid plan is required. Pro is $3.99 USD per month through Stripe for 100 total analyses per calendar month, with no daily plan cap. Daily and monthly usage reset at midnight UTC and on the first of the month. Platinum is $9.99 USD per month for up to 10,000 words per analysis and 300 analyses per month. The free website demo needs no signup.
Can I check a short post or a whole paper?
Very short passages may not provide enough context for a useful assessment. Free analyzes the first 1,500 words, Pro the first 5,000, and Platinum the first 10,000. If your source is longer, a notice tells you exactly how much was analyzed and links to plans that cover more. Check the words-analyzed count and any notices before treating a report as a review of the whole source. For a long paper, choose a section with enough surrounding context.
Does it verify facts, citations, or authorship?
Arbitir reviews reasoning in the text. It does not establish that a claim is true, authenticate every citation, prove AI authorship, or grade a student's ability. Use its findings to guide further checking, including reading the original evidence.
What happens to the text I submit?
Arbitir uses hosted analysis services, including AI processing. It retains report findings, limited quotations, and metadata, rather than saving the full submitted body as an analysis record. The application privacy policy explains data handling; review it before submitting sensitive material.
Read with better questions
Have a source in mind?
Give it a closer look.
Bring the claim you are about to cite, the paper you are about to submit, or the story you are about to share.