About Latency Radar
The Problem
In 2025, I released a smartwatch app for cricket fans that showed live match scores directly on Wear OS watches.
The idea was simple, but I quickly ran into a problem: my server was hosted in Amsterdam, while many of my users were in India and other regions far away from Europe. The app felt fast for me, but I had no clear way to verify how it performed globally.
I searched for tools that could quickly test latency from different parts of the world, but most solutions were either built for large enterprise teams, locked behind subscriptions, overloaded with complexity, or simply too slow to use for quick validation.
I wanted something straightforward: paste a URL, run a test, and instantly understand where a website or API is slow.
The Solution
Latency Radar was built to solve exactly that.
In seconds, you can test your website or API from multiple global regions, currently including:
- Amsterdam
- Montreal
- San Francisco
- Singapore
- Tokyo
No account required.
Latency Radar measures not only total latency, but also the individual network phases behind it:
- DNS lookup
- Connection time
- TLS handshake
- Time to first byte (TTFB)
- Total response time
With this tool I aim to help developers quickly identify where performance problems exist globally, before users notice them.
Who Built This
Daniel Martínez
Founder, MarCas Code
I am an indie developer based in the Netherlands, primarily focused on web development, with a strong interest in wearable technologies, user experience, and performance-focused software.
I am obsessed with building products that feel good to use: fast interfaces, smooth interactions, and responsive applications. To me, performance is a core part of UX. Fast websites and APIs not only improve technical metrics, but also create better experiences for users.
Over the years, I have worked on applications ranging from smartwatches to large-scale web platforms, and Latency Radar grew out of that mindset: a simple way to quickly understand how websites and APIs perform from different parts of the world without unnecessary complexity.
Learn More
Paste a URL and check global latency in seconds.
Compare real-world latency snapshots for popular services.
Learn how geography, TTFB, DNS, and hosting choices affect UX.
Read common questions about tests, limits, privacy, and tokens.