# Substack (substack.com)

Is substack.com legit and trustworthy? Truth score 57 out of 100, mixed truth signals: 5 of 11 public checks clear, 1 to be cautious about, 2 not found, 3 for information. Legitimacy confidence: mixed. Customer satisfaction: not enough reviews to say.

- Truth score: 57 out of 100
- Legitimacy confidence: mixed
- Claimed: no
- Assessed: 2026-10-26

## Business details

- Founded: 2017
- Kind of seller: Sells its own goods or services
- Licensed trade: No licence normally needed
- Domain age: 16 years
- Address: 548 Market Street PMB 72296 San Francisco, CA 94104
- Email address: Not found
- Phone number: Not found
- Contact page: https://substack.com/contact
- Website: https://substack.com/
- Social media: Not found

## Summary

substack.com's website address was registered 16 years ago, and is locked against transfer to someone else. Be cautious: One known data breach involves the company (Substack), the latest 1 years ago. We could not find customer reviews, social media profiles, an email address or a phone number.

Important context: Truth Signal weighs public evidence about this business. A high score means strong evidence that the business is established and legitimate, not a promise that it is safe to buy from or that every purchase will go well. A low score means the evidence is thin or raises concerns, not that the business is unsafe or a scam.

Final check: terms page linked: the site's own pages name it in a link or heading, but no such page was read.

## Positives

- Its website address was registered 16 years ago (source: rdap)

## Be cautious

- One known data breach involving the company: Substack, the latest 1 years ago (source: hibp)

## Not found

- Customer reviews information was not found from our checks. (source: reviews)
- Social presence information was not found from our checks. (source: social)
- Email address information was not found from our checks. (source: website)
- Phone number information was not found from our checks. (source: website)

## How to check if substack.com is legit

To check if substack.com is legit yourself, look at the same public records we did: the company register, who owns the web address and since when, customer reviews, visitor numbers, how long the site has existed, social profiles, malware lists, data breaches and email security. Each row below shows what that record says about substack.com; open a row to see the facts and the source to check them yourself. Step by step: [how to know if a shopping site is legit](/guides/how-to-know-if-a-shopping-site-is-legit).

- Who they are: Company details: Based in the US; founded in 2017 (Wikipedia) (For information)
- Who they are: Domain registration: Its website address was registered 16 years ago (Clear)
- Who they are: Website details: We read 3 of its pages: contact, about and privacy (Clear). Pages found: contact (https://substack.com/contact), about (https://substack.com/about), privacy (https://substack.com/privacy)
- Reputation and track record: Customer reviews: We were unable to find out what its customer reviews say. (Not found)
- Reputation and track record: App Store: Its app, Substack, is on Apple's App Store, rated 4.8 out of 5 from 52,509 ratings, counted in the reviews total. (For information)
- Reputation and track record: Visitor traffic: Its visitor numbers jumped suddenly into the top 10,000 websites by March 2026: a burst of traffic rather than a steady history (For information)
- Reputation and track record: Web history and authority: Found: wikipedia page (Clear)
- Reputation and track record: Social presence:  (Not found)
- Safety: Malware and phishing: No malware or phishing warnings found for its website (Clear). This check is not perfect: it can miss a harmful site, and it can wrongly warn about a safe one.
- Safety: Data breach history: One known data breach involving the company: Substack, the latest 1 years ago (Be cautious)
- Safety: Domain and email security: Its email is protected: mail forged in its name is blocked (Clear)

## What its pages say

Quoted word for word from substack.com's own pages.

- In their own words: “Make money doing the work you believe in. Substack is building a new one that puts writers, creators, and subscribers in charge. The rest powers the platform that supports your work.” (https://substack.com/about)

## Could not be checked this time

- social, bbb

## Cite

Truth Signal, Substack: truth score 57 out of 100, legitimacy confidence Mixed, assessed 2026-10-26, https://truthsignal.com/business/substack.com. Licence CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). The same report as JSON: send Accept: application/json to https://truthsignal.com/business/substack.com