Find someone on Substack by username
Substack gives writers two separate identities: a personal @handle and a publication subdomain. Given either string, AliaScan checks 400+ platforms for the same handle.
See a full sample report free — no sign-up. Then run your own Substack search.
Search a Substack username →What a Substack username search reveals
- •Matching accounts on Twitter/X, Medium, LinkedIn and personal sites
- •The writer's other public publishing and social profiles
- •Exact handle matches connecting a newsletter to its author
How Substack usernames work
- •Claiming a handle turns a profile address from substack.com/profile/<numeric id> into substack.com/@<handle>
- •Changing a handle releases the old one immediately — anyone else is free to claim the string you gave up
- •A publication is a separate object with its own address, <name>.substack.com, and it does not have to match the writer's personal handle
- •Changing a subdomain breaks every existing link unless the writer uses the redirect option, which can only be used once per publication
Substack writers are building an audience they intend to take with them, so the handle is almost always the one they already use on X and their own site — the entire model depends on being recognisable. The weak point is the release-on-change rule: a discarded handle can be picked up by a stranger straight away.
How to search a Substack username in 3 steps
- Copy the Substack username you want to look up.
- Paste it into the AliaScan search box and start the scan.
- Review the platforms where that handle exists, with a direct link to each public profile.
A common use case: Verifying who actually writes a newsletter before subscribing or paying for it. AliaScan only surfaces information that is already publicly visible on each newsletter platform.
What a Substack username search can’t tell you
A search cannot see paid-subscriber posts, subscriber counts, revenue or private notes, and a live handle does not mean anyone is publishing behind it. Substack is full of profiles claimed to read rather than to write. Personal handles and publication subdomains diverging is normal here, so never assume a subdomain identifies the author.
Substack username search — FAQ
Can I find someone on Substack by their username?+
Yes. Enter the Substack username into AliaScan and it checks whether that same handle is registered across 400+ other platforms, returning public profile links for each match.
Is the Substack username search free?+
You can view a complete sample report free and without signing up, so you can see exactly what a scan returns before paying. Running a search on a username of your own is covered by AliaScan's one-time and lifetime plans.
How accurate is a Substack username lookup?+
AliaScan reports only public profiles where the exact username exists. Because handles are frequently reused, a match is a strong signal — but always confirm identity with additional context.