Pith: open preprints with review built in
Be early.
Put your work on the record today. Send Pith your paper and you get back a close reading of it: what it claims, where it could break, what to fix.
Make your account. It is free.
Continue with ORCID Your first review is free when you sign in with ORCID: one free review for each account.
Continue with Apple You can hide your email from Pith.
Continue with X Your @handle appears on your comments.
We never post for you or send marketing email. Privacy. Reading Pith needs no account.
An account, a paper, a reading, a record.
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Make your account
No password. Pith emails you a six-digit code.
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Send your paper
Upload it or give its arXiv number. The reference check is free.
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Get it read
A full Pith Review, or a signed review by a listed reviewer.
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Publish
Your paper goes up free with its review beside it.
498,446
papers reviewed
live · read 15 Nov 2026, 01:39 UTC
38,279,161
citations mapped
live · read 15 Nov 2026, 01:09 UTC
Every paper, read.
Pith is a preprint site with review built in. A preprint is a paper shared before journal review, so people can read it and argue with it right away. On Pith, every paper also gets read closely, and the reading is published beside it.
No drawer. No waiting.
You don't need a sponsor, an endorser or an institutional email. You need a paper.
- Send it
Upload a PDF, a .tex file or a source archive, or give its arXiv number. It stays private until you choose to publish.
- Free
The reference check costs nothing; you sign in to start it. Every reference is looked up, and every problem is quoted back to you.
- $5
A full Pith Review arrives by email when it is ready. Half of the last 100 reviews finished within 29 minutes of being sent, 9 in 10 within 66 minutes (measured 15 Oct to 15 Nov 2026). Paying buys the reading, never the verdict.
- No score bar
Publish whenever you choose, whatever the score. The score and any blocking finding go up with the paper.
- DOI
Your paper goes up free with its review beside it. For $10 Pith also puts it on the record: a DOI for a paper that is not on arXiv, so it can be cited like any other, and the exact PDF anchored in Bitcoin.
Every review, out in the open.
A machine can read every paper. The judgment that matters most is still a qualified person reading yours closely. Pith connects you with that person and publishes what they find.
- Signed
Order a review of any paper on arXiv or on Pith from a listed reviewer in its field. It's signed and published on the paper's page, whatever it concludes.
- From $200
You choose the deadline, 7 to 14 days, and see the price before you pay. If no reviewer accepts within 72 hours, you are refunded in full.
- Separate
A signed review never decides whether a paper is published. It adds an expert's judgment to the record, where readers can weigh it.
Review for Pith, and get paid for it.
Apply with ORCID and choose your fields. Papers arrive as offers, never assignments.
After Stripe's card fee, Pith keeps 15% and you receive the rest. A critical review pays the same as a glowing one.
Every review you write adds to a public record of how your judgments held up. That record is your credential, and it belongs to you.
Every judgment, yours to challenge.
Pith has one set of rules. They're published, and they apply to everyone the same way.
- Challenge
Anyone signed in can challenge a claim in a review, with evidence, on a public ledger.
- No veto
No editor can quietly turn a paper away. An editor can act only on an integrity hold, and every hold goes into a public log.
- Work only
The score reads the review's findings, never the author's name or institution.
- Audit
Publication counts and score distributions are public on the audit page.
Work that changes a field usually looks early when it arrives. Put yours on the record today.