Link Safety Check
Is this link safe? A phishing link checker for SMS, email and chat.
Users paste a suspicious link. Our server, not their phone, follows every redirect (HTTP, meta refresh and simple JavaScript), then checks a public list of almost 400,000 active phishing domains, domain age via RDAP, look-alike letters, brand names on the wrong domain, fake login pages, downloads, free hosting and risky TLDs. The result is a clear verdict with the reasons and the full redirect chain.
- Stage
- Live, free
- URL
- linkcheck.fullstackpartner.com
- Revenue
- Planned API and email add-on
- Price
- Free; API planned
- Audience
- Consumers, small offices, helpdesks
- Stack
- Static HTML/JS · PHP 8.5 · nginx · SQLite · Phishing.Database · RDAP
The problem
- SMS and email phishing is the most common fraud people meet, from parcel fees to fake MitID pages.
- Short links hide the real destination.
- Most people have no safe way to check a link before clicking.
The product
An SSRF-safe server-side fetcher (public IPv4 only, pinned DNS, ports 80 and 443, size and time limits) and a scoring engine that explains every finding. Query strings and bodies are not logged.
- Long-press the link and copy it.
- Paste it and press Check.
- Read the verdict, the final destination and why.
Who pays and why
Business model
| Revenue line | Price | Notes |
|---|---|---|
| Free | 0 kr | 20 checks per 5 minutes. |
| API (planned) | Usage based | For helpdesks, email gateways and chat bots. |
Market and targets
Phishing link checkers get large and growing search volume, with spikes during scam waves. The audience overlaps with the email security checker.
The tools are free and stay free. Revenue comes from paid add-ons and from leads for the paid security suite. Targets are planning assumptions.
Go-to-market
Launch
- Live (done)
- Search Console
Content
- Pages on current scam waves
- Danish version
API
- Key-based API
- Outlook and Gmail add-in
Channels
| Organic search | is this link safe, phishing link checker, url unshortener. |
|---|---|
| Press during scam waves | Easy to explain tool. |
Competition
| Alternative today | Why we win |
|---|---|
| VirusTotal, urlscan.io | Powerful but technical. |
| Google Safe Browsing | Built into browsers, but silent until a page is known bad. |
What we measure
- Checks per month
- Share of suspicious or dangerous results
- Return visitors
Status and roadmap
- Redirect follower for HTTP, meta refresh and JavaScript with loop detection
- SQLite list of ~390,000 active phishing domains, refreshed every 6 hours
- RDAP domain age, homoglyph and brand impersonation detection
- Login-form, download and obfuscation detection on the final page
- Own subdomain with Let's Encrypt, strict CSP, HSTS, no cookies, no analytics
- SEO: unique title, description, FAQPage and WebApplication schema, sitemap and Open Graph card per page
- Installable PWA with offline support
- Cross links between all five free tools and SiteSentry
- End-to-end browser test of every page and flow
- Headless browser rendering for JavaScript-heavy pages
- Screenshot of the final page
- API
Risks
| Risk | How we handle it |
|---|---|
| False positives on real sites | Weak signals are labelled low or info and the verdict explains itself. |
| Abuse as an open proxy | Only reads pages, blocks private networks, rate limited, nothing returned except metadata. |
Want a product like this?
We build version one of products like Link Safety Check from about $3,000: web app, admin panel, mobile app and API, live on your own domain. Then we can host and maintain it for $500 a month.