Analytics for the files you already have.

Fella turns a local folder into a read-only workspace for analysis. It calculates, shows its work, and keeps the source close.

curl -fsSL https://lilfella.app/install.sh | sh
Why fella exists

v0.2.0 unsigned early build local-first latest release

life-adminHow did spending change?
How did my spending change this year?
Fella
Spending is up 18% this year, mostly from travel in April and groceries in December. The trend holds across the year, not one outlier.
Monthly spending
Values in $
Checked
transactions.csv · 2025 vs 2026
Monthly spending, 2025 and 2026 $1.8k $1.2k $600 $0 Jan Mar Apr Jun Sep Dec
Show exact values
Month20252026
Jan$760$820
Apr$1,120$1,440
Dec$1,370$1,660
Add source
gemma4:31b

I keep a lot of my life in files. Fella is a small, read-only analytics harness that gives an agent a bounded workspace for making sense of them without asking me to organize everything first.

At work, I use Snowflake, repeated queries, and a growing collection of reports, exports, and documents. At home, it is CSVs, PDFs, XLSX files, notes, and old versions of things I meant to clean up. I want to ask a question in plain language and understand where the answer came from.

Fella works from a folder on my computer. It builds a read-only workspace, searches and calculates, and lets me choose the model it uses. The files stay where they are, and the system stays limited to the work I ask it to do.

Read why fella exists

A few practical questions

Is it fast?

Very, when the question is mostly a calculation. Fella can list files and run calculations locally, so a small CSV feels immediate. A folder full of PDFs has more to read. It is not a race car. It is a careful little accountant.

Does my data leave my computer?

The mounted folder stays local and read-only. If you choose a hosted model, the question and the context needed to answer it may be sent to that provider. Fella does not quietly upload the whole folder.

Can it delete or reorganize my files?

No. It can inspect, calculate, and draw a chart. It cannot tidy your downloads folder, which is probably safer for everyone involved.

Does it replace SQL or spreadsheets?

No. It gets you to the useful question faster and shows the query when one was used. Keep the spreadsheet. It has earned its little kingdom.

Can it still be wrong?

Yes. Evidence makes an answer inspectable, not infallible. Fella shows the steps, the source, and the figures it checked, and should say when the data is missing or ambiguous.