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Jump / RSI · Android app

Measure vertical jump height from phone flight time

SpeedTrackr turns a jump clip into height and power from flight time — the same idea as an electronic jump mat, running on the phone you already carry. Sign in to measure a clip in your browser, or get the Android app for live capture and RSI drop jumps.

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Toolkit demo · jump / RSI

Sprinter driving out of the blocks — power that jump testing is meant to track

Flight time in. Height and RSI out.

In the app

How flight-time jump testing works

Record the jump

Film a standing or reactive jump on an Android phone. Keep the camera steady and the takeoff and landing in frame.

Read flight time

The app uses the time you spend in the air — the same physics used by many electronic jump mats.

Get height and RSI

Flight time becomes vertical jump height and reactive strength index. Review the numbers in the Android app or in the browser after sign-in.

Jump height and RSI readout from a phone video in the SpeedTrackr Android app
Honest scope

A training jump tool — not a lab plate

Use SpeedTrackr to trend jump height and RSI in practice. Force plates remain the gold standard for labs and research. You do not need a dedicated jump mat for the phone method; a stable camera helps more than extra hardware.

What you get

Vertical height and RSI from flight time, on Android, free to start. Same app as dual-phone start/finish timing gates, reaction, and on-device VBT.

What this is not

Not a force-plate substitute, not official competition jump testing, and not a restored web MediaPipe analyzer. Coach roster and Excel export are also in the Android app — not a separate web dashboard.

Category context

Phone jump apps, without the dunk

My Jump Lab and Metric Jump earn their attention for phone jump and RSI. SpeedTrackr's bet is jump and RSI inside the same Android session as start/finish timing, reaction, and phone VBT, with Coach Mode so height lands under the right athlete. Practice grade flight time jump. Not a force plate.

Use a dedicated jump app if that is all you need. Use SpeedTrackr when the phone already runs the rest of practice testing.

From the track

Jump guides on the blog

Calculate vertical jump height from flight time
Physics

Calculate vertical jump height from flight time

The kinematics behind converting air time into height — the method the Android app uses.

Measure vertical jump with no equipment
Field test

Measure vertical jump with no equipment

Wall-and-reach methods when you only have chalk — and why a phone flight-time reading is the next step.

Vertical jump and RSI on Android — no jump mat
Android product

Vertical jump and RSI on Android — no jump mat

Quotable product guide: flight-time jump/RSI in SpeedTrackr, honesty vs My Jump Lab / Metric Jump, and the Play path — without restoring a web calculator.

Frequently asked questions

Short answers about what lives in the Android app — and what does not.

Is there still a web vertical jump calculator?
Yes — sign in at speedtrackr.com/auth/login and open Jump Measure in the browser, or use the Android app on Google Play for live capture and RSI. This page is the marketing guide; the tool is behind sign-in.
Can I calculate vertical jump height in the browser?
Yes after sign-in. Open Jump Measure on the web (or use the Android app). Flight-time height and RSI — no invented formula widget on this marketing page.
How does SpeedTrackr measure vertical jump?
From flight time in a phone video. Time in the air is converted to jump height, and reactive jumps can also report RSI. You do not need a dedicated jump mat.
How accurate is phone flight-time jump testing?
It is a training tool. A stable camera and a clean takeoff and landing improve consistency. It is not a lab force plate or a certified competition jump system.
How does SpeedTrackr compare to My Jump Lab or Metric Jump?
Those apps are strong phone jump options. SpeedTrackr's angle is an Android session lab: jump and RSI sit next to dual-phone start/finish timing, reaction, and bar speed VBT, with names on every test. We do not claim force plate parity or invent competitor accuracy numbers.
Does SpeedTrackr timing give intermediate split times?
No. Dual-phone timing gates are practice grade start/finish for one elapsed time. Jump and RSI are a separate tool.
Do I need a jump mat?
No for practice. Film the jump on Android and trend height and RSI week to week.
Is SpeedTrackr Android-only?
Native app is Android on Google Play. Jump, VBT, and reaction also run on the web after sign-in at speedtrackr.com/auth/login for iOS. Dual-phone timing gates still need two Android phones. There is no native iOS App Store app.
Is jump testing free?
SpeedTrackr is free to start. Premium unlocks extra sessions inside the app. Check Google Play or the in-app paywall for current paid tiers — we do not list prices here.
Does my jump video leave my phone?
Follow the in-app privacy prompts for jump analysis. VBT lifting clips are processed on-device; other video features may require an upload. See the privacy policy for the current details.
Who built this, and who is it for?
SpeedTrackr was built by sprinter Dafin Edison in Chennai. Jump/RSI is for athletes and coaches who want practice-grade power numbers from a phone they already own — not a full biomechanics lab.
Where can I read the flight-time math?
Two guides on the site walk through the physics: calculate jump height from flight time and measure vertical jump with no equipment. The Android app does the calculation for you.

Get jump height on Android

Record a jump, read flight time, and trend height and RSI in the SpeedTrackr app. Free to start.

Get the Android app