Tennis stroke analysis, one fix at a time
Upload one rally clip. SwingVantage names the flaw costing you the most points, with drills and a 7-day plan built around it.
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Sample report
SAMPLE · TENNIS · SIDE VIEW
Primary fix identified
Prepare the unit turn earlier and meet the ball out in front of the lead hip, extending the arm through contact instead of pushing at the ball beside the body.
Late contact point on the forehand → pushed, paceless strokes
- On the side view, the racket is still preparing when the ball is already arriving (late unit turn)Estimated
- Contact appears beside/behind the hip line rather than roughly an arm-length in frontInferred
- A short, blocked finish suggests the arm never extended through the contact zoneInferred
The faults
The faults that cost you most
Fault 01
Late contact
Ball played behind the front hip — pace leaks and the face stays open.
Fault 02
Arm-only forehand
Hips and torso stay quiet, so the arm does all the work.
Fault 03
Open-face floaters
Short, high balls that invite the attack.
Your report names the one that costs you most.
Upload
One swing video from your phone.
One fix
Your top fault, drills, and a 7-day plan.
Retest
Re-upload on day 7 and measure the change.
Seven sports · one engine
Built for your sport
Tennis Strokes SwingVantage Covers
Each stroke has a dedicated phase checklist aligned with professional-tour technical models.
Forehand
Unit turn, contact point depth, follow-through height
Backhand (2H)
Hip-shoulder separation, left-arm drive, extension
Backhand (1H)
Shoulder rotation, grip position, finish height
Serve
Toss placement, trophy position, pronation timing
Volley
Compact stroke, contact point in front, split step
Overhead
Shoulder turn, trophy position, contact above head
What SwingVantage can and can't tell you
Every result carries the same honest label everywhere you see it — so you always know what's precise, what's an estimate, and what to trust for your next session. Our free engine does the everyday read; optional AI depth is coming later.
Measured
Read straight from your launch monitor or sensor data. The most precise number we can show.
Estimated
Our free coaching engine compares your swing to research benchmarks for your sport and level. Trustworthy direction you can train on today — no AI required.
Inferred
AI that reads your video frames is coming later — optional extra depth on top of the free read. Single-camera limits will still apply.
Self-reported
Based on what you describe yourself. Useful context, and as accurate as the details you share.
Proof, not just claims
Here's a worked Tennis example on sample data — the same shape your real report takes. We show the evidence, the confidence, and what we honestly can't know.
Example diagnosis
Late contact point: the hitting arm is beside or behind the front hip at contact rather than out in front — a preparation-and-timing issue, not a grip problem.
Top fix: Prepare the unit turn earlier and meet the ball out in front of the lead hip, extending the arm through contact instead of pushing at the ball beside the body.
What SwingVantage uses
- On the side view, the racket is still preparing when the ball is already arriving (late unit turn)Estimated — how to read this label
- Contact appears beside/behind the hip line rather than roughly an arm-length in frontInferred — how to read this label
- A short, blocked finish suggests the arm never extended through the contact zoneInferred — how to read this label
What it can't know
- Exact racket-head speed or spin without a sensor/radar
- Whether footwork or ball-reading is part of the lateness (needs live, multi-angle looks)
- Anything about wrist, elbow, or shoulder health — stop if you feel pain
How you'll measure progress
On day 7, re-film 10–15 forehands from the same side-view angle and distance. Freeze at contact: is the racket out in front of the lead hip now, with the arm extended? Re-record every 1–2 weeks to track the trend, not a single ball.
Coach summary
Player contacts the forehand late, beside the body, producing pushed strokes with no pace. Priority: earlier unit turn and contact out front with extension. Drills assigned: toss-and-hit contact point, shadow extension, early-preparation bounce-call. Retest in 7 days from a fixed side angle.
What do the confidence labels mean?
Illustrative example
Sample data, not your swing — used on demos and the sample reports so you can see the format before you start.
Heuristic estimate
A smart, data-backed read from limited input (a self-report or a single video). It is honest about being an estimate, and it sharpens every time you add a swing.
Measured
Read directly from launch-monitor or sensor data you import, or from a verified, calibrated multi-camera setup. A phone video is never labelled measured — what we read from it is an estimate.
We always show you which one you are looking at, and never present an estimate as a measurement.
Your swing, decoded — coaching in your pocket. SwingVantage reads your swing and gives you the one fix that matters most, with data-backed guidance you can use today. Its findings are estimates that get sharper with every swing you add. For injury concerns or advanced technique, pair it with a coach — you'll show up to those sessions already ahead.
Your data stays yours
- Sign in and your data is saved to your own private account and synced across your devices; without an account it stays on your device. Either way it is yours alone.
- Swing videos are analyzed in your browser and are not shared publicly by default.
- You can export everything SwingVantage knows about you at any time.
- You can delete any record — or everything — instantly from Settings.
Frequently Asked Questions
- What tennis strokes can SwingVantage analyze?
- SwingVantage analyzes forehands, backhands (one-handed and two-handed), serves, volleys, and overhead smashes. Each stroke type has its own phase-by-phase checklist based on professional-tour technical models.
- Do I need a tennis sensor or Hawk-Eye data?
- No sensor is required. SwingVantage can analyze a simple phone video. If you have data from a tennis sensor (racquet speed, spin rate, efficiency), you can also import that for more detailed analysis.
- What does the AI look for in a tennis swing?
- The system checks shoulder unit turn, hip-to-shoulder separation, contact point depth and height, racquet path angle, follow-through position, grip pressure patterns, and footwork sequencing.
- Can SwingVantage help me fix my double faults?
- Yes. SwingVantage identifies serve mechanics issues — toss placement, trophy position, pronation timing, and contact point — that are the most common causes of double faults.
- Is SwingVantage suitable for junior tennis players?
- Absolutely. SwingVantage scales benchmarks by skill level (beginner through elite) and age group. Parents and coaches can use it alongside in-person coaching.
Guides for your game
- Tennis Forehand Analysis: Fix the Most Common FaultsA reliable forehand comes from a unit turn, a relaxed low-to-high swing path, and contact out front. Diagnose your fault and groove the fix with simple drills.
- Tennis Backhand Basics: Build a Reliable StrokeA reliable backhand starts with an early turn, a stable base, and a low-to-high path. Here is how to diagnose your backhand and three drills to groove it.
- How to Hit a Topspin Forehand (Low-to-High Made Simple)Topspin comes from a relaxed low-to-high swing that brushes up the back of the ball, not a wrist roll. How to set the grip, path, and contact point.
- Tennis Grips Explained: Forehand, Backhand & ServeA plain-English guide to the main tennis grips — continental, eastern, semi-western, western — and which to use for the forehand, backhand, serve, and volley.
- Tennis Serve Technique: Build a Reliable, Powerful ServeA reliable tennis serve comes from a loose arm, a consistent toss, and an up-and-out swing into the court — not muscling it. How to groove it.
- How to Hit a Tennis Volley (Punch, Don’t Swing)A clean tennis volley is a short punch with a firm wrist and a continental grip — not a swing. Here is how to diagnose and groove compact, controlled volleys.
From the blog
- Tennis Forehand Fundamentals: What Consistent Hitters Do DifferentlyConsistency on the forehand comes down to a few repeatable mechanics. Here is what separates reliable hitters from streaky ones.
- How to Fix a Late Forehand in TennisLate contact is usually a preparation and footwork problem, not a swing-speed problem. Here is how to meet the ball out in front again.
Find your one fix
One upload. One fix. One plan. One retest.
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