Substack Username Search

Search for any Substack username and discover linked profiles across 500+ platforms. Check Substack account exposure and digital footprint risk.

Run a Free Scan Username Search

What this covers

Where a public username appears across 500+ social, dating, gaming, developer and forum platforms.
Variants and re-use patterns that link a handle to other accounts owned by the same person.
Profile metadata that is publicly visible: avatar, bio, join date, post count, last-seen activity.
Confidence-scored matches so you can separate verified profiles from likely look-alikes.

How FootprintIQ runs a username search

Query 500+ public platforms in parallel through ethical, rate-limited OSINT modules.
Normalise raw matches, drop false-positives with platform-specific signature checks.
Score each finding 0–100 with the LENS engine (Layered Entity & Network Scoring).
Sort findings by exposure risk so you act on the most damaging ones first.

Honest limits

FootprintIQ uses Open-Source Intelligence (OSINT) on public data only. We never bypass authentication, scrape behind logins, or access private accounts. Every result includes a confidence score so you can tell verified matches from likely matches that need human review. Use FootprintIQ for self-audit, authorised investigations, or compliance research — not for harassment, doxxing, or surveillance.

FootprintIQ

Search Any Substack Username Instantly

Trace a Substack username across 500+ platforms. Discover where a newsletter author's handle appears on X, LinkedIn, and community sites.

FootprintIQ — Ethical Digital Footprint Intelligence

FootprintIQ is an ethical digital footprint intelligence platform. We use open-source intelligence (OSINT) techniques to help people understand their online exposure — without surveillance, monitoring, or invasive data collection. Our platform scans usernames across 500+ social media platforms and forums, detects email breaches, identifies data broker listings, and provides probability-based confidence analysis using our proprietary LENS engine — all built on publicly available data with full transparency.

Scanning Capabilities

Username search across 500+ social platforms, forums, and developer communities
Email breach detection using multiple data sources including Have I Been Pwned
Data broker exposure identification across major people-search aggregators
Phone number lookups and reverse phone intelligence (Pro plan)
Name-based people search aggregation and cross-referencing
Dark web mention monitoring for leaked credentials and personal data
LENS AI confidence scoring to reduce false positives and improve result accuracy

Our Ethical Principles

Public data only — we never access private accounts or bypass authentication
No surveillance, monitoring, or tracking of individuals
User-initiated scans with full informed consent
LENS provides probability-based analysis, not identity confirmation
Designed for ethical self-audit as the safest and most responsible use case
Transparent methodology — we explain exactly how our tools work

Privacy & Data Removal Resources

FootprintIQ provides comprehensive guides for removing personal information from the internet, including step-by-step data broker opt-out instructions for sites like Spokeo, BeenVerified, and MyLife. Our Privacy Centre gives you full control over your data, and our guides cover Google content removal, address removal from Google Maps, and strategies for cleaning up your digital footprint after a data breach.

Educational Content & Research

Explore our blog covering topics like what is OSINT, how data brokers work, username reuse risks, identity theft prevention, and the role of AI in modern intelligence gathering. Our 2026 Username Reuse Report and Digital Exposure Report provide research-backed insights into online privacy trends. Visit our AI Answers Hub for instant, expert-level responses to your digital privacy and OSINT questions.

Who Uses FootprintIQ

Individuals auditing their own digital footprint, job seekers preparing for employer background checks, developers checking for leaked credentials, crypto users protecting wallet-linked identities, executives managing impersonation risks, and security professionals conducting authorised investigations. FootprintIQ is not a data broker, people-search site, surveillance tool, or background check service.