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TechSight CLI

Free tech stack detection for 7,500+ technologies — no API keys.

Open source · MIT · Production-tested inside LeadGrow's live pipeline

Quick install

$ pip install -e ".[dev]"

View on GitHub →Want a custom version?

What you unlock

A Python CLI that fingerprints a domain's tech stack from HTTP headers, cookies, meta tags, script sources, HTML patterns, DNS TXT records, and TLS certificates. 7,500+ technologies across 100+ categories, zero API keys, zero per-lookup cost. Drops straight into a lead enrichment pipeline — give it a CSV with a domain column and it fills in the tech stack column.

OutcomeBuilt at LeadGrow, used in live pipelines, shipped open source so you don't have to build it yourself.

How it works

See it in action

2 things you can do right now.

No UI. No clicking. Just commands that execute.

Scan a single domain

$ techsight scan notion.com

✓ notion.com — 23 technologies detected → Next.js, React, Vercel, Segment, Intercom

OutcomeFull tech stack in 3 seconds. No API account. No billing. No rate limits.

Enrich a CSV with tech stack column

$ techsight scan

--csv leads.csv

--concurrency 20

--output enriched.csv

✓ 847 domains scanned (12 min) → Saved → enriched.csv

Outcome847 companies enriched at zero marginal cost. Replaces a paid API entirely.

What's included

Every capability, ready to script.

7,500+ technology signatures via WebAppAnalyzer community database

7 detection vectors: DNS, headers, cookies, meta, scripts, HTML, TLS

Multi-vector confidence model — 95% threshold with 2+ independent signals

CSV enrichment with domain-column autodetection and configurable concurrency

JSON output for scripting, Rich table for terminal-first workflows

The workflow

End to end. Zero manual steps.

Replaces paid tech-detection APIs. Zero marginal cost at any list size.

01

Get a CSV with domains.

Export from Clay, Attio, or any source. TechSight needs one column with domain names — everything else is optional.

$ techsight scan

--csv clay-export.csv --output with-tech.csv

02

Detect and score tech stacks.

TechSight runs 7 detection vectors per domain: headers, cookies, meta tags, scripts, HTML patterns, DNS, and TLS. 95% confidence threshold — 2+ independent signals required to report.

$ techsight scan

--csv with-tech.csv --concurrency 20

03

Filter by ICP tech.

Keep only companies running your ICP's exact stack. Competitors, wrong tools, or missing signals get cut before the list ever reaches a campaign.

$ techsight filter --csv with-tech.csv

--has "HubSpot,Salesforce" --output qualified.csv

04

Load qualified list into campaign.

Push the filtered, tech-qualified list directly into Bison. Only companies that match your ICP tech get emails. Zero wasted sends.

$ bison leads upsert --file qualified.csv

--workspace "outbound-q2" --batch-size 500

Real scenarios

What teams actually use it for.

Not theoretical. These are the pipelines running at LeadGrow and client stacks today.

01Filling Tech Stack columns in lead enrichment CSVs at zero marginal cost

02Qualifying prospects by tech stack before cold outreach

03Replacing paid tech-detection APIs in data-prep pipelines

Included skills

Pre-built automations. Ready to run.

These aren't demos. They're the Claude Code skills we run inside LeadGrow, shipped open source so you don't have to build them yourself.

tech-qualifier

Tech Qualifier

Scans a domain for tech stack using 7 detection vectors. Returns a confidence-scored tech list. Flags companies below the 95% threshold so you don't act on weak signals.

Triggers: Before any ICP qualification step

csv-enricher

CSV Enricher

Takes a CSV with a domain column and adds a tech stack column. Runs at configurable concurrency. Exports enriched CSV ready for the next pipeline stage.

Triggers: "enrich [file] with tech stack"

icp-tech-filter

ICP Tech Filter

Takes an enriched CSV and a required-tech list. Returns only companies that match all specified technologies. Cuts wasted outreach before it starts.

Triggers: After csv-enricher completes

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Custom build

Want us to build yours?

Custom CLIs, MCP servers, and Claude Code skills wired to your exact GTM stack.

We build these for clients. Then we ship them open.

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