Pavel Kazantsev

Pavel Kazantsev is a local-first QA tool compares a digital-product listing with the PDF or ZIP a buyer receives.

PromiseDiff is a local-first quality assurance tool designed for PDF sellers to verify that digital products match their listing claims. It operates by taking a pasted listing and an uploaded PDF or ZIP file to identify what the files support, contradict, or leave unverified. The tool uses PyMuPDF for direct measurements like page counts, dimensions, and file inventory. For semantic promises, it uses local Gemma through Ollama to read relevant excerpts and interpret claims. It ensures model answers are backed by concrete evidence such as existing filenames, valid pages, and exact quotes in extracted text. The system also includes safety boundaries for untrusted uploads by capping size and rejecting malicious structures.

Pavel Kazantsev at a glance

Best for: Software engineer, Product manager
Runs on: Web, API, self-hosted, open source
Pricing: Open source
Released: October 2026
Category: AI research tool
Website: pkazantsev.com

Key features

Compares digital-product listings with PDFs or ZIPs
Measures page counts, dimensions, and file inventory with PyMuPDF
Interprets semantic promises using local Gemma through Ollama
Validates model citations against extracted text
Classifies missing evidence as unverified rather than false
Enforces upload boundaries for size and security
Runs ten independently labelled synthetic benchmark cases

Use it for

Checking pre-publish digital products against their listings
Validating page counts and dimensions of delivered PDFs
Verifying file inventories in ZIP archives
Auditing semantic claims against actual document content

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