This is an overview of accurate speed tests. That is, the speed tests are displayed on the descending accuracy score as determined by the standardized speed test. The accuracy score is listed in brackets after the speed test.
Note that which speed test is most accurate depends on the speed test you measure. For this list we tested with an advertised speed of 100 Mbps.
- Frontier Internet Speed Test Tool (100) Mainstream Ookla
- M-Lab (100) Mainstream Tip
- Ookla Speedtest (100) Mainstream Pop
- RealSpeed (100) Mainstream Tip
- MyCCI (99) Mainstream Ookla
- Optimum (99) Mainstream Ookla
- Fireprobe (98) Mainstream
- Speakeasy (98) Mainstream Ookla
- AT&T (97) Mainstream Ookla
- Google Fiber (97) Mainstream Tip
- Meter.net (97) Mainstream
- Samknows (original) (97) Mainstream
- Xfinity Speed Test (97) Mainstream
- Cloudflare (96) Pop
- TestMy.net (96) Tip
- Astound (94) Mainstream
- SpeedSmart (94) Mainstream
- nPerf (92) Mainstream
- Bredbandskollen (91)
- Broadband Speed Checker (86)
- SpeedOf.me (83) Realistic Pop
- SpeedOf.me API sample page (81) Realistic Tip
- DSLReports (81) Mainstream
- Speedcheck™ (75)
- OpenSpeedTest™ (38)
- Bandwidth Place (20)
- Comparitech (20)
- Fast (20) Pop
- Internet Speed at a Glance (20) Tip
- IPv6 Test (20)
- LibreSpeed (20)
- Speedtest4.php (20)
- Toast (20)
- Verizon (20)
- Which Broadband Checker (20)