substack.com
Website
SubstackSubstack is the app for independent voices: a free newsletter, video, and podcast hosting platform with paid subscriptions built in.
SubstackSubstack is the app for independent voices: a free newsletter, video, and podcast hosting platform with paid subscriptions built in.
Own this business? See what is holding the score back.
Truth score
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
- substack.com/
contact - Website
- substack.com
- Social media
- Not found
Customer reviews
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</a>Summary
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.
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.
Positives
- Its website address was registered 16 years ago.
Be cautious
- One known data breach involving the company · Substack, the latest 1 years ago.
Not found
- Customer reviews information was not found from our checks.
- Social presence information was not found from our checks.
- Email address information was not found from our checks.
- Phone number information was not found from our checks.
Our technical team has been informed.
What they offer
Substack is the app for independent voices: a free newsletter, video, and podcast hosting platform with paid subscriptions built in.
- Best for
- “Whether you’re running a solo business or a full newsroom, Substack is built for you.” Its about page
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.
Who they are
Company detailsBased in the US; founded in 2017 (Wikipedia)
- Where the company is based
- US
- Why we believe that
- the site's structured data states its country, its postcode is a US zip code
- Type (Wikipedia)
- corporation
- Founded
- 2017
Domain registrationIts website address was registered 16 years ago
- Its website address is locked against being transferred to someone else
- Domain age
- 16 years
- Domain transfer lock enabled
- Yes
Website detailsWe read 3 of its pages: contact, about and privacy
- HTTPS enabled
- Yes
- Contact phone number found
- Not found
- Contact page found
- Contact page
Quoted word for word from substack.com.
- 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.” About page
Reputation and track record
Customer reviewsWe were unable to find out what its customer reviews say.
| Platform | Rating | Reviews |
|---|---|---|
| Trustpilot | Not checked | |
| SmartCustomer | Not checked | |
| G2 | Not checked | |
| Capterra | Not checked | |
| Reviews.io | Not checked | |
| Feefo | Not checked | |
| Trustindex | Not found | |
| Not checked |
App StoreIts app, Substack, is on Apple's App Store, rated 4.8 out of 5 from 52,509 ratings, counted in the reviews total.
- App
- Substack
- App Store page
- https://apps.apple.com/gb/app/substack/id1581650857
- App Store rating
- 4.8 out of 5
- App Store ratings
- 52,509
Visitor trafficIts visitor numbers jumped suddenly into the top 10,000 websites by March 2026: a burst of traffic rather than a steady history
- Real people have visited its website since February 2021 or earlier
- It is among the 2,000 most-visited sites on the internet (Cloudflare Radar)
- Popularity among Chrome users
- top 10,000 sites
- First known user traffic
- Feb 2021 or earlier
- Months with real traffic, of the last 24
- 9
- Traffic pattern
- intermittent
- Rank jump in the last 12 months
- unlisted to top 10,000 by 2026-03
- Rank drop in the last 12 months
- none
- Popularity across the internet
- top 2,000 sites
Web history and authorityFound: wikipedia page
- Wikipedia page
- yes
Social presence
| Platform | Profile | Audience |
|---|---|---|
| Not checked | ||
| Not checked | ||
| X | Not checked | |
| Not checked | ||
| YouTube | Not checked | |
| TikTok | Not checked |
Safety
Malware and phishingNo malware or phishing warnings found for its websiteThis check is not perfect: it can miss a harmful site, and it can wrongly warn about a safe one.
- Malware or phishing threat status
- None
Data breach historyOne known data breach involving the company: Substack, the latest 1 years ago
- Known data breaches found
- 1
In October 2025, the publishing platform Substack suffered a data breach that was subsequently circulated more widely in February 2026. The breach exposed 663k account holder records containing email addresses along with publicly visible profile information from Substack accounts, such as publication names and bios. A subset of records also included phone numbers.
- Accounts affected
- 663,121
- Date
- 23 Oct 2025
- Data exposed
- Email addresses, Phone numbers
Breach data: Have I Been Pwned
Domain and email securityIts email is protected: mail forged in its name is blocked
- MX records
- Yes
- SPF record
- Yes
- DKIM key
- Yes
- DMARC record
- Yes
- DMARC policy
- reject
- Security certificate browsers warn about
- No
- Certificate issuer
- Google Trust Services
- Certificate type
- DV
- Certificate expires
- 18 Dec 2026
- Nameservers
- ali.ns.cloudflare.com
lee.ns.cloudflare.com - Address
- 104.18.37.200
172.64.150.56