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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.","context":"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.","sections":[["Positives","good",[{"text":"Domain registered 16 years ago","source":"rdap","plain":true}]],["Be cautious","bad",[{"text":"1 known data breach(es): Substack (latest 1 years ago)","source":"hibp","plain":true}]],["Not found","none",[{"text":"Customer reviews information was not found from our checks.","source":"reviews","plain":false},{"text":"Social presence information was not found from our checks.","source":"social","plain":false},{"text":"Email address information was not found from our checks.","source":"website","plain":false},{"text":"Phone number information was not found from our checks.","source":"website","plain":false}]]],"missing":["social","bbb"],"page":{"rows":[["Who they are","registry","Company details","building","Based in the US; founded in 2017 (Wikipedia)","info"],["Who they are","rdap","Domain registration","clock","Its website address was registered 16 years ago","good"],["Who they are","website","Website details","globe","We read 3 of its pages: contact, about and privacy","good"],["Reputation and track record","reviews","Customer reviews","star","We were unable to find out what its customer reviews say.","none"],["Reputation and track record","appstore","App Store","smartphone","Its app, Substack, is on Apple's App Store, rated 4.8 out of 5 from 52,509 ratings, counted in the reviews total.","info"],["Reputation and track record","crux","Visitor traffic","eye","Its visitor numbers jumped suddenly into the top 10,000 websites by March 2026: a burst of traffic rather than a steady history","info"],["Reputation and track record","wayback","Web history and authority","history","Found: wikipedia page","good"],["Reputation and track record","social","Social presence","users","","none"],["Safety","safe_browsing","Malware and phishing","bug","No malware or phishing warnings found for its website","good"],["Safety","hibp","Data breach history","lock","One known data breach involving the company: Substack, the latest 1 years ago","bad"],["Safety","dns","Domain and email security","shield-check","Its email is protected: mail forged in its name is blocked","good"]],"tally":"1 be cautious · 5 clear · 2 not found · 3 for information","held":null,"satisfaction":[["App Store","4.8","52,509 ratings",true]],"average":"4.8","found":{"registry":[],"rdap":[["Its website address is locked against being transferred to someone else","good"]],"website":[],"reviews":[],"appstore":[],"crux":[["Real people have visited its website since February 2021 or earlier","good"],["It is among the 2,000 most-visited sites on the internet (Cloudflare Radar)","good"]],"wayback":[],"social":[],"safe_browsing":[],"hibp":[],"dns":[]},"provided":[],"sections":[["Positives","good",[{"text":"Its website address was registered 16 years ago","source":"rdap"}]],["Be cautious","bad",[{"text":"One known data breach involving the company: Substack, the latest 1 years ago","source":"hibp"}]],["Not found","none",[{"text":"Customer reviews information was not found from our checks.","source":"reviews"},{"text":"Social presence information was not found from our checks.","source":"social"},{"text":"Email address information was not found from our checks.","source":"website"},{"text":"Phone number information was not found from our checks.","source":"website"}]]]},"answer":"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.","advisory":null,"citation":{"source":"Truth Signal","url":"https://truthsignal.com/business/substack.com","assessed_at":"2026-10-26T10:06:13.232913+00:00","licence":"CC BY 4.0","licence_url":"https://creativecommons.org/licenses/by/4.0/","cite_as":"Truth Signal, Substack: truth score 57 out of 100, legitimacy confidence Mixed, assessed 2026-10-26, https://truthsignal.com/business/substack.com"}}