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Lilac

A Python tool for searching, cleaning, and quantifying datasets before training an LLM.

Checked 3 Oct 2026 Reviewed by Alex Listed since September 2024

Screenshot of Lilac

At a glance

Starts at Free The vendor's site is offline, so no current price was found.
Free tier Yes
Platforms Web
Best for ML teams cleaning data before training
Not for Teams wanting a no-code, install-free tool

3.9 out of 5

Scored by Alex after real use

Our verdict

Lilac is a Python tool, installed via pip, for searching, quantifying, and editing large datasets before they go into an LLM, with built-in PII and duplicate detection and semantic search. Its faster hosted compute tier, Lilac Garden, is still waitlisted rather than generally available. It's aimed at data and ML practitioners comfortable working in Python, not teams wanting a fully no-code interface.

✓What it does well

Semantic and keyword searchIt supports both semantic and keyword search across a dataset.
Built-in data checksIt flags PII, duplicates, and language automatically, or lets you add a custom signal.
Fast large-scale processingIts Garden tier can cluster a million data points in about 20 minutes.

✕Where it falls short

Garden tier is waitlistedThe faster Lilac Garden compute tier is still waitlisted, not generally available yet.
Python install requiredIt requires a pip install and comfort working in Python, not a no-code UI.
Built for practitionersIt's aimed at data and ML practitioners rather than non-technical business users.

Key features

Semantic searchIt lets you search a dataset semantically, not just by keyword.
PII and duplicate detectionIt automatically flags PII, duplicate records, and language per entry.
Data clusteringIt clusters and titles large numbers of data points quickly.
Field editingYou can edit and compare fields directly within a dataset.

Questions about Lilac

What is Lilac?

Lilac is a Python tool, installed with pip, for searching, cleaning and quantifying large datasets before they are used to train an LLM. It offers semantic and keyword search, automatic flagging of PII, duplicates and language, data clustering, and editing and comparing fields within a dataset.

Is Lilac free?

Lilac is listed as free, with a free tier and no paid plan. The vendor's site is offline, so no current price was found, and the faster hosted compute tier, Lilac Garden, is still on a waitlist rather than generally available.

What is Lilac Garden?

Lilac Garden is Lilac's faster hosted compute tier, which can cluster a million data points in about 20 minutes. It is still waitlisted rather than generally available, which the reviewer lists among Lilac's shortcomings.

Who is Lilac for?

Toolio lists Lilac as best for ML teams cleaning data before training. It is aimed at data and ML practitioners comfortable working in Python, not non-technical business users or teams wanting a no-code tool that needs no install.

How does Toolio rate Lilac?

Alex scores Lilac 3.9 out of 5 after real use, in a review checked on 3 Oct 2026. The reviewer praises its semantic and keyword search and built-in data checks, while noting the Python install it requires and the waitlisted Garden tier.

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