PREP vs. Ockem Proof: two bets on automation
Continual Engine’s PREP is the competitor most like us — both products bet that machines should do the mechanical majority of remediation. The differences are in what happens to the last mile, what you can prove afterward, and what you pay.
The short version
PREP is a cloud remediation platform that says it “automatically remediates 95% of the document with 100% accuracy,” with AI alt text, conversions to HTML, Word, text and ePub, and a services arm — priced by customized quote. Ockem Proof makes a different bet on the same automation thesis: no accuracy percentages, because averages aren’t a compliance posture. The rule engine re-verifies every machine fix automatically, judgment calls wait in decision queues for a person, a document cannot be certified while any check is unresolved — and the price is published, per document.
Side by side
Compared as of . Vendors change their offers; our sources are listed at the end of this page.
| Continual Engine PREP | Ockem Proof | |
|---|---|---|
| The automation bet | Says it “automatically remediates 95% of the document with 100% accuracy,” and that its output “is 100% compliant with ADA/508/EAA regulations and WCAG 2.2 AA guidelines.” | No accuracy marketing — the rule engine re-verifies every machine fix automatically, and unresolved means uncertified. |
| Pricing | Customized pricing — contact required; no prices published. | A published price per document. The free assessment prices your whole library. |
| The last mile | A built-in accessibility checker and your review in the tool — or their services team. | Judgment calls wait in decision queues; every decision is recorded with who made it, and the certificate names the attester of record. |
| Deliverable | A remediated PDF plus accessibility reports; a customer quoted on PREP’s page mentions “the certificate of WCAG and PDF compliance PREP provides.” | A remediated PDF plus a certificate: per-criterion outcomes, the attester of record, and every saved version kept by default. |
| Where the AI runs | A cloud platform “hosted on both Amazon and Azure web servers,” running PREP’s own proprietary AI. | Inference runs on hardware Ockem operates, with self-hosted open models; no customer document content goes to a third-party model. |
| Beyond PDF | Conversions to HTML, Word, text and ePub — genuinely broader. | PDF-focused: audit, remediation and certification for document libraries. |
Choose Continual Engine PREP if…
- You need format conversions — ePub, HTML, Word — alongside remediation, especially in publishing workflows.
- You need complex STEM and image descriptions at publisher scale, where their AI description work is a real strength.
- You want an established higher-education vendor relationship with a services arm attached.
Choose Ockem Proof if…
- You need to know the price today, not after a quote cycle.
- An accuracy percentage isn’t something you can hand to a lawyer — you need per-document evidence with an attester of record behind it.
- Your documents can’t go to a third-party AI model.
- Your volume is bursty — a backlog now, a trickle later — and self-serve published pricing fits better than a negotiated platform deal.
Fair questions
PREP says it automates 95% of the work. Doesn’t Proof do the same thing?
The automation percentage is where the similarity ends. An average across documents is a marketing statistic; compliance is decided per document, criterion by criterion. Proof’s architecture assumes the machine will sometimes be wrong: every fix is re-checked automatically by the rule engine, anything requiring judgment goes to a person whose decision is recorded, and the certificate gate is strict — one unresolved check and the document is not certified. The question to ask any automated vendor is not “what percent do you automate?” but “what happens to the part you got wrong, and who signed the result?”
Which is cheaper?
We can only tell you our number — a published price per document, on the pricing page — because theirs requires a quote. That asymmetry is the point: you can compute your total cost with Proof before talking to anyone, and the free assessment will price your actual library. If PREP quotes you lower for the same corpus, bring us the quote; the comparison that matters is total cost to a certified document with a record of every check.
Where do our documents actually go?
PREP says its application is hosted on Amazon and Azure web servers. Proof runs inference on hardware Ockem operates, with self-hosted open models; no customer document content goes to a third-party model, and tenant isolation is enforced by row-level security in the database. If your security review has specific language about data processing, bring it to us.
Comparison written by Ockem. Competitor details, including the quoted automation, accuracy and compliance figures, are taken from the PREP page on continualengine.com as of October 2026 and may change. If we’ve got something wrong, tell us and we’ll fix it.
See the difference on one of your own PDFs.
Free, no account. You get the remediated file and a verification record; certify it for $59 when you’re ready.