Side by side
Komodo PDF vs Mozilla PDF.js
Both stand on pdf readers. Which one you can start free with, which one lets you read the code, and what each costs once you pay.
Free plan LinuxMacWindows
Komodo PDF pairs familiar reading controls with a document-grounded AI panel and clickable citations. Consider how you want to route chat, since remote providers receive retrieved passages while the stated local setup keeps documents on the laptop.
Visit Komodo PDF
Free plan APIExtensionLinux+2
PDF.js offers a free, open-source foundation for PDF rendering, with both an API and an adaptable viewer. Developers should account for browser differences, the lack of OCR and the default cross-origin restriction.
Visit Mozilla PDF.jsThe facts
| Komodo PDF | Mozilla PDF.js | |
|---|---|---|
| Free plan | Yes | Yes |
| Open source | Not published | Not published |
| Runs on | Linux, Mac, Windows | API, Extension, Linux, Self-hosted, Web |
| Lowest paid plan | Free or on request | Free or on request |
| Plans published | 1 | 1 |
| Maker | Not published | Not published |
| Website | komodopdf.com | mozilla.github.io |
| On pdf readers | #10 of 24 | #6 of 24 |
Komodo PDF: what it does well
- Answers cite and highlight source passages.
- Supports standard PDF navigation and text selection.
- Scanned pages without text layers are identified.
- Works with local chat endpoints.
- Free and open source under GPLv3.
What to know first
- Remote chat sends retrieved passages to its provider.
- The maker describes it as a focused reader, not an Acrobat clone.
- Windows downloads are listed; macOS and Linux builds are from source.
Mozilla PDF.js: what it does well
- Provides an API for rendering PDFs and retrieving document information
- Viewer layer can be adapted for a custom interface
- Supports form filling and some annotation types
- Prebuilt builds and CDN-hosted copies are available
What to know first
- Does not provide OCR support
- Cross-origin requests are blocked by default
- PDF feature support varies by browser and version
- Some local use requires a web server
Alternatives to Komodo PDF Alternatives to Mozilla PDF.js The whole list