See what your
swing is doing.
Stop guessing at your faults from feel. Record on the one camera you already own, get it on your iPad the instant you finish, and study it frame by frame until you know what's really happening.
One camera — no extra gear
Your iPhone is the only camera you need. Prop it up face-on or down-the-line and record at up to 240fps.
On your iPad, instantly Direct
Every clip transfers the moment you stop, over a direct encrypted link between the two devices. No cables, no cloud.
Live mirror & coach station
Mirror your iPhone's view to the iPad in real time, so you — or a coach — can watch every swing as it happens and mark it up remotely.
Slow motion & frame-by-frame
Scrub to the exact frame and step through one at a time — at the clip's true frame rate, so 240fps means 240 real frames of the downswing.
Draw, compare & overlay
Draw lines and angles on the swing, set two swings side by side in sync, and toggle reference-line and hand-path overlays.
Your body, tracked
joint by joint.
Record a swing and Certus draws the full skeleton over your own footage — hips, shoulders, arms, hands — frame by frame through the whole motion.
Scrub to any frame and see exactly where everything was. No sensors, no suit, no studio: the iPhone you already own.
Address, top and impact
— found for you.
The three positions every lesson talks about are detected automatically. Tap one and the video jumps there — no scrubbing back and forth hunting for the strike.
At 240fps that matters: impact is one frame out of hundreds, and Certus lands on it.
This week,
against your best.
Put any two swings side by side — or ghost one over the other — and step both in sync, frame by frame.
Filmed from different distances? Scale one to match the other. Different tempos? They stay locked to the same positions anyway.
Mark it up like
a lesson.
Draw lines, angles and freehand notes straight on the video — swing plane, shaft lean, head movement — and they stay with the clip.
Pair an iPad as a coach station and the marking-up happens live, at arm’s length, while the player swings.
Swing
The core capture. Record a full swing, and it's on your iPad the instant you stop.
- Up to 240fps slow motion
- Hands-free start via AirPods
- Transfers to iPad automatically
- Face-on or down-the-line
Live to iPad
One tap on the cast button and your iPad becomes a coach station — a live mirror of the iPhone's view. No recording required; just swing and watch.
- Live view, no need to record
- Coach can record & annotate remotely
- Encrypted peer-to-peer link
- Works in Swing and Practice
Practice
Groove reps with a coach that counts. On-device pose detection recognizes your positions as you work.
- Real-time pose detection, on device
- Recognizes each rep
- Clips captured at high frame rate
- Share at true frame rate
Thirty-plus swing measurements
Chest and pelvis turn, X-factor, shoulder tilt, side bend, spine angle, sway and slide in real inches, hand path, arm angles, tempo and swing timing — computed from every clip you record, no sensors to wear and nothing clipped to your glove.
Accuracy mode LiDAR
On Pro iPhones, Accuracy mode records depth alongside the video — real distances, not estimates. That anchors the skeleton to real-world scale, so sway reads in true inches and hand speed in true miles per hour, and rotation is measured against real depth instead of a guess.
Honest numbers, labeled Trust
Every measurement carries its confidence. Depth-anchored numbers are badged ANCHORED; monocular estimates are badged VISUAL ESTIMATE. When a camera angle can't physically see a movement, Certus greys the number out and tells you why — it never quietly reports a figure nobody should trust.
The right angle for the job
Face-on is the honest view for sway, slide, and side bend. Down-the-line is the honest view for turn and plane. Each measurement is tagged with the angles it's valid from, so you always know which clip to film for the question you're asking.
All of it on your device
Pose detection, measurement, and analysis run on the iPhone itself. Your swing videos are yours — analysis doesn't require shipping your body's motion to someone else's server.
Review: built for study
Pinch to zoom into your grip, pan while zoomed, step frames with a fingertip. The chrome fades when you play, and one tap brings it back. Watching at quarter speed on a 240fps clip is one minute of footage per second of swing.
Telestration that keeps up
Freehand pen, straight lines, and angles, drawn right on the frame. Annotations stick to the clip and travel with it — mark a swing up on the iPhone and the drawing arrives intact when you review it on the iPad.
Compare, properly
Two swings side by side, each independently scaled and positioned so the golfers match size — or ghosted on top of each other with a fade slider. Sync them once and they step through together, frame for frame.
Overlays on demand
Reference lines for spine and shaft plane, a traced hand path, and a clubhead trail when you ask for it — drawn from the measured skeleton, so they move with the swing instead of sitting on top of it.
Auto-analysis, overnight
Favorite a clip and Certus analyzes it in the background — plugged in, on Wi-Fi, without cooking your battery. Open the app in the morning and the measurements are waiting.