No full-document embedding index.
LEXIS builds a fast lexical search index instead of generating and storing vectors for every document passage. Local models help find and answer from the relevant passages.
A private workspace for your documents
Chat with large documents,
completely offline
When your documents are too many to read and too confidential to upload, keep the conversation on your Mac. Ask across manuals, research, contracts, and internal records. Get answers with the passages behind them, without sending your files to a server. Index thousands of files locally, with no per-file fees or cloud bill.
Download for macOSFree. No account needed.
Apple Silicon · macOS 26.4+ · 16 GB RAM recommended · ~67 MB
FROM THE DOCUMENT TO THE ANSWER01 / 03
Employee handbook3 documents
What is the parental leave policy?
Employees are eligible for 12 weeks of paid parental leave following birth or adoption, after six months of continuous employment. 1
Leave can be taken continuously or in two blocks within the first year. 2
Employee handbook.pdfp. 34–35
Ask about your documents…
A
conversation, with the evidence attached.Illustrative preview
01
Confidential stays local.
Client files, internal policies, unpublished research. Your documents, search index, and conversations stay on your Mac.
02
Sources, always close.
Follow an answer back to the passage it came from. Read it in context, in a click.
03
Built for large collections.
Search the relevant passages across long documents and whole folders, without squeezing your collection into a chat upload.
Bring the whole collection
Thousands of files.
Zero indexing fees.
Your archive doesn’t need a cloud budget.
Index it on your Mac. Rebuild it whenever you need.
Add as many files as you want
Bring thousands of files into a project group. Keep folders together, review what’s included, and remove individual files or whole folders when your collection changes.
Reindex without another bill.
Add or remove content and rebuild the group’s index locally. No per-file fees, paid indexing credits, API charges, or subscription.
Your Mac provides the storage and processing power. Very large collections, long documents, and scanned PDFs can take a while to read and index. LEXIS shows progress and lets you cancel.
Made for your Mac
For the files
you can’t upload.
Some work needs to stay on your own computer. LEXIS lets you explore confidential contracts, technical archives, and internal knowledge without a cloud AI service. Search and answering both run on your Mac, with no account or cost per question.
Connect once to download the
models.
Then take your work offline.
Before you download
- Hardware
- Apple Silicon Mac
- System
- macOS 26.4 or later
- Memory
- 16 GB recommended
- Available storage
- ~11 GB
- Installer
- ~67 MB
- Initial model download
- ~5.1 GB
Model downloads show progress and resume if interrupted. Internet is only needed for setup.
A few things to know
Good questions.
Does any of my data leave my Mac?
Your documents, search index, and conversations stay on your machine. LEXIS runs locally, with no accounts or app telemetry. The initial model download needs an internet connection.
Is LEXIS free to use?
Yes. LEXIS is free for personal and commercial use. The models run on your hardware, with no subscription or cost per question.
Can I index thousands of files for free?
Yes. LEXIS has no per-file indexing fees or paid indexing credits. It builds the search index on your Mac without a full-document embedding index or a cloud API. Collection size is limited by your available storage and hardware; large imports can take a while.
What happens when my collection changes?
Add or remove content in the group and LEXIS rebuilds its search index locally, at no charge. To refresh a file you have edited, remove its imported copy and add the updated file again. Original files are kept.
Will it work on an Intel Mac?
LEXIS currently supports Apple Silicon Macs only. We recommend 16 GB of memory for the local models.
How much space do I need?
Allow around 11 GB for the app, models, and database, plus space for your documents. The installer is about 67 MB; the first launch downloads around 5.1 GB of models.
Can I check where an answer came from?
Yes. Answers include source references so you can open the relevant passages and read them in context. AI can make mistakes, so check important answers against the original document.
Keep your work close
Find answers in your files.
Keep the files on your Mac.
Download LEXIS for macOS
Your documents. Your Mac. Your space.