California Internet Speed Test
Free California speed test. Measure your Xfinity, AT&T Fiber, Spectrum or Sonic connection and compare against the California average.
Top ISPs in California
These are the most common providers our users in California test against:
- Xfinity
- AT&T Fiber
- Spectrum
- Sonic
- Frontier
What NetStartr measures for California users
Click the button above and we measure download speed, upload speed, ping, jitter and packet loss in roughly 20 seconds. We benchmark against the California averages (265 / 40 / 14 ms) so you can immediately tell whether your line is performing as expected for your country or state.
The test runs entirely in your browser using Cloudflare\'s global edge — no signup, no app install, no data sold. After the test, we tell you what your connection is good for (4K streaming, gaming, calls) and how much of your ISP\'s advertised plan you\'re actually getting.
Get accurate results
- Test from a wired Ethernet connection if possible.
- Pause cloud syncs (iCloud, Drive, Dropbox).
- Run the test 2-3 times and take the median.
- Test at peak (evening) and off-peak (morning) to spot ISP congestion.