What Vibration Checker does
Every phone has a motion sensor called an accelerometer. It’s the part that turns the screen when you rotate the phone. Vibration Checker reads that sensor through your browser and turns the raw numbers into a plain answer:
- How strong the shaking is, in mm/s (or in/s).
- How fast it shakes, in Hz (times per second) and RPM.
- Whether that’s normal for the thing you’re testing, with a label like “Noticeable” or “Rough, check it”.
You tap Start and keep your hands off for a 2-second “Hold still…” step while the tool measures your phone’s own sensor noise. Then you watch the reading live. When it stops, after 30 seconds on most pages, you get a result with a chart, a one-line summary, and buttons to save an image, download a CSV file or share it.
Each tool page is set up for one job. It tells you where to put the phone, which scale to use, and what the result means for that thing. The site also has calculators and plain-English guides.
Who it’s for
People standing next to something that shakes who want a quick, honest answer:
- Homeowners and renters with a washer that walks across the floor, a fridge that buzzes, a floor that bounces, or a house that shakes at night. Start with the washing machine test or the house vibration logger.
- Neighbors of building sites and busy roads who want a record of when the shaking happens. The construction vibration monitor logs each event with its time, peak and frequency, and makes a PDF report.
- Car owners who want to describe a shake to a mechanic. The car vibration test checks whether the shake matches how fast your wheels turn. A passenger holds the phone, never the driver.
- DIYers and technicians who check a fan, pump or motor before and after a fix. Try the machine vibration test or the fan balancing tool.
- Students and teachers who want a free physics lab. The pendulum experiment measures gravity with a swinging phone.
Most laptops and desktops have no motion sensor. On a computer, the sensor pages show a QR code to open the same page on your phone, and a demo with sample data. The calculators, like Hz to RPM and the vibration unit converter, work on any device.
What it is not
A phone is not a calibrated vibration meter. Every reading is a good guide, not a certified measurement. It’s useful for comparing before and after a fix, spotting a pattern, or starting a conversation with a landlord, contractor or repair shop.
It isn’t evidence for a legal dispute, an insurance claim or a decision about whether a building is safe. For those, hire a professional with calibrated equipment. How it works explains the math and shows the results of the engine’s own tests.
Why it’s free
The sensor is already in your phone, and modern browsers can read it. There’s no good reason to charge you for a first answer or make you install an app to get it. Most vibration problems start with one simple question: is this normal? That answer should be free and take less than a minute.
How it’s paid for
The site shows native ads from Adsterra: small picture-and-title tiles. They appear in the content areas: below the tool, between sections of text, and in the side column on large screens. They load only after you scroll, and never while a tool is measuring.
Ads never appear inside the tool panel. That’s on purpose. A stray tap on an ad during a measurement would ruin the result. Your readings are never shared with advertisers. The privacy page explains what the ad provider can see and the choices you have.
No signup, no app, nothing uploaded
You don’t need an account, and there’s nothing to install. All the math runs in your browser, and your readings never leave your phone. Images, CSV files and PDF reports you save go straight to your device. The loggers keep their data in your browser only, with a Delete all logs button.
How the pages are written
Every page follows the same rules:
- Plain English. Short sentences, no jargon without an explanation.
- Named sources. Numbers come from published guidance, and the source is named next to them: the Caltrans vibration guidance manual (2020) for how people feel vibration, ISO 10816-1 for machines, DIN 4150-3 and USBM RI 8507 for construction and blasting, and USGS for earthquake intensity. There’s no published scale for ceiling fan wobble, so the fan pages use a rule of thumb and say so.
- Honest limits. Every sensor tool page has a section on what it can’t measure. Phones can’t read vibration faster than about 30 times a second, and the pages say so.
- Safety first. Never measure while driving. Keep your hands and phone away from moving parts. Secure the phone so it can’t fall into a fan or machine.
Spotted a mistake, or a page that doesn’t work on your phone? Contact us and include your phone model and browser. Each page shows the date it was last updated.
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