Every account starts free. Pro raises the limits across all four tools and adds saving and exporting in the Writing Lab.
| Tool | Free | Pro — $8/month |
|---|---|---|
| Fallacy Finder | 750 characters per analysis PDF uploads up to 2 MB |
10,000 characters per analysis PDF uploads up to 10 MB |
| Bias Checker | 750 characters per analysis PDF uploads up to 2 MB |
10,000 characters per analysis PDF uploads up to 10 MB |
| Fallacy Quiz | 3 quizzes per day | Unlimited quizzes |
| Writing Lab | 1 saved document 750 words per document On-demand analysis |
Unlimited documents 10,000 words per document Live analysis as you write Reasoning score Text and PDF export |
| Analysis model | Claude Sonnet — fast, solid on everyday arguments | Claude Opus — slower, better on long or subtle reasoning |
A note on that repeated 750. It isn’t the same limit in each place. The Fallacy Finder and Bias Checker count characters — roughly 120 words. The Writing Lab counts words. So a free Writing Lab document holds about six times as much text as a single free Fallacy Finder analysis.
Limits are checked when you act, not in advance. If you paste 2,000 characters into the Fallacy Finder on a free account, you’ll be told the text is too long rather than having it silently truncated — nothing is analysed and nothing is charged against you.
The quiz limit is a rolling calendar day, counted against completed quizzes. It resets at midnight, and abandoning a quiz part-way doesn’t use one up.
Whether you cancel or a payment fails, the same thing happens: your account reverts to the free limits at the end of the period you’ve paid for.
Nothing you have created is ever deleted. Every document, quiz score and saved analysis stays in your account, and every document stays visible and readable in the Writing Lab — including documents beyond the free limit of one.
What changes is what you can do next:
Resubscribing restores everything immediately — there’s no migration step and nothing to restore by hand.
You can upgrade at any time from your account, and the new limits apply straight away. Cancelling is handled through the same billing portal you can reach from your profile — see cancelling a subscription for the steps.
The Educator Pack is a one-time $39 purchase, not part of the Pro subscription. Buying Pro doesn’t include the Pack, and buying the Pack doesn’t give you Pro limits in the tools. They can be held in any combination, and the Pack never expires. See For educators.
