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A speed test gives you download, upload and ping numbers. NetBlame splits the path into three hops — your phone, your router and your line — judges each one, and names the hop that's to blame along with an ordered fix checklist.

Yes. Diagnosis, culprit isolation and fixes are free. NetBlame Pro is an optional subscription that removes ads and unlocks shareable reports.

NetBlame never names a fake culprit. When hops tie or a hop can't be measured, it tells you so instead of guessing.

After you follow the checklist, re-measure. NetBlame shows the before/after result for the culprit hop so you can see the improvement.

Testing the line on mobile data is off by default. If you turn it on, NetBlame asks before each test. You can also choose the download test size in Settings.

Yes. Every diagnosis is saved to History, and Stats shows a calendar and a heatmap of the times your connection struggles.