I built TrafficChecker (https://trafficchecker.net) because I was frustrated with the state of "free" SEO tools. Most require an email sign-up or have aggressive paywalls just to see basic visitor counts.
TrafficChecker gives you instant insights for any domain without an account: - Monthly visitor estimates & trends - Domain Authority calculation - Traffic source breakdown (Direct/Search/Social) - WHOIS info & Domain Age - Geographic visitor distribution
Technical Implementation:
Stack: Laravel 12, Redis, MySQL, Tailwind. Queueing: I use Laravel Horizon to manage background jobs.
For single lookups, it's synchronous/cached. For bulk CSV uploads (the paid feature), it pushes jobs to a Redis queue to process thousands of domains in parallel without timing out.
Data: Aggregated from multiple third-party analytics APIs and cached to reduce upstream costs.
It's a solo dev project. The single-domain lookup is permanently free/unlimited. Monetization is via bulk CSV processing and API access.
Would love feedback on the responsiveness and any data points you find missing.