Dart Throw Analysis App: How Camera Based Analysis Works

What is a dart throw analysis app?

A dart throw analysis app captures your throwing motion with the camera of your smartphone or tablet and turns it into numbers. Many such apps stop at basic pose tracking and draw the throw trail. That shows you the movement, but it gives you no measurable values and no concrete training hints.

mydart detects 33 body points, calculates elbow angle, arm path and follow through for every throw and shows you where your technique varies. Instead of relying on how your technique feels or checking yourself in the mirror, you get measurable data and concrete hints, without needing to study sports science. You can find every metric and evaluation in the overview of mydart's features.

Dart throw analysis: four approaches compared

Throw analysis does not have to mean an app. There are four common approaches, and each answers a slightly different question. Which one suits you depends on whether you want to find a fault or prove progress.

Mirror or window. Costs nothing and shows obvious faults such as a wandering elbow or a crooked stance. What a mirror cannot show is the moment of release, because the movement is too fast for that.
Phone video in slow motion. Shows the release and the follow through in detail. The catch: you look at single throws and compare them by eye. How much your throws vary across a whole session stays invisible. How to set up camera and frame rate for this is covered in filming darts in slow motion.
Coach. Sees connections, explains causes and corrects on the spot. But a coach only sees a fraction of your throws and estimates rather than measures. Where the line between the two runs is described in dart coach or app.
Throw analysis app. Measures every throw the same way and calculates the variation across many throws. It does not explain why a value varies, and it only sees what the camera sees.

In practice the approaches complement each other. Video and coach help with understanding, the app with measuring. Whether an app is worth it for you, including every case where the answer is no, is covered in is dart throw analysis worth it.

Why objective feedback is crucial for your dart training

Most dart players train by feel. You throw, look at the result and try to adjust something next time. The problem: Your body sensation often deceives you. What feels like an identical throw to you can be technically completely different. Small deviations in elbow angle or release phase are barely visible to the naked eye, but have a significant impact on accuracy.

A measurement breaks this cycle of guessing and assuming. If you think your elbow is stable, for example, but the evaluation shows a deviation on every fourth throw, you have a clear starting point. You are no longer working against invisible errors, but against named, measurable problems.

What metrics mydart measures

mydart captures several aspects of your throwing motion and converts them into measurable metrics. The most important are elbow angle in the different phases, stability of upper arm and shoulder, straightness of arm movement and quality of follow-through. What each value means and which ones actually matter in training is explained in the article on throw analysis metrics.

Elbow angle and release timing

The elbow angle at the moment of release largely determines the flight path of the dart. A release that is too early or too late leads to vertical deviations. mydart measures the angle for every throw and shows you whether you consistently stay in the optimal range of around 150 to 160 degrees or whether your release timing varies. Why consistency matters more than a perfect value is covered in the article on the elbow angle in darts.

Stability of upper arm and shoulder

The upper arm should remain quiet throughout the entire throw. Any movement there adds unpredictability. mydart detects whether your upper arm or shoulder rises, drifts sideways or swings differently than intended on some throws.

Follow-through quality

The follow-through reveals a lot about the control of your throwing motion. Does your arm point toward the target after release or does it pull to the side? mydart measures the direction and length of this phase and helps you develop a clean finish to the movement. There is more on this in the article about the follow-through in darts.

Consistency across multiple throws

Besides individual throws, consistency between consecutive throws is decisive. mydart compares your throws with each other and shows you where your technique varies. This helps you recognise patterns, for example whether your second throw of a round tends to be worse than the first.

How a throw analysis with mydart works

An analysis needs no equipment beyond a smartphone or tablet that stands steady. The process has four steps.

1. Set up the camera

Place the device to the side of your throwing arm, roughly at shoulder height. The whole throwing arm has to be in frame, from the backswing to the end of the follow through. Directly behind you does not work, because your body then hides the important joints. Use the same position for every session if you can. A single camera sees the movement from one direction, so a different position changes the measured angles. In the app you specify where the camera stands, and both front and rear cameras are supported.

2. Warm up and start the session

Throw a few darts to warm up, then start the session. From now on mydart detects automatically when you throw. You do not start or stop a recording, you simply step up to the oche and play.

3. Throw as usual

While you throw you can optionally see the detected skeleton with its joint angles over the camera image. After every throw the app shows what stood out. The camera images are processed only on your device and are not sent to a server.

4. Review the session

At the end you see the mean, the spread and the outliers for every metric, and you can compare the session with earlier ones. This is where the real value lies, because a single throw says little while a series of 30 or more throws says a lot.

Example: how to read an evaluation

The following values are a made up but typical example. A player throws a session of 40 darts at the 20. The mean release angle is 151 degrees, nothing unusual. It only gets interesting with the spread: across the first 20 throws the angle varies by about 3 degrees, across the last 20 by about 7 degrees. At the same time the follow through gets shorter in the second half.

Looking only at the mean, everything would seem fine. The spread says something else. The technique is stable at the start and falls apart over time. That points to fatigue or fading concentration rather than a technical fault. The sensible response is therefore not to work on the angle, but to shorten the session or take a break after 20 throws, and then check in the next session whether the spread in the second half gets smaller.

This pattern is why throw analysis is more than an angle meter. It shows when and under which conditions your technique gives way. How to set up such comparisons over several weeks is described in comparing sessions.

What a camera cannot measure

Honest throw analysis knows its limits. These four matter most.

Viewing angle. A camera sees the movement from one direction. Movements towards or away from the camera appear shortened. Only sessions with the same camera position are therefore comparable.
Light and frame rate. In a dark room or with very fast movements, body points are detected less precisely. Good light improves detection more than any other detail.
What happens on the board. mydart does not count points on the board and does not recognise which barrel you throw. The app measures the movement, not the result. More on this in detecting a dart from a photo.
Grip pressure and finger work. How firmly you hold the dart and how your fingers release it is too small a detail for a camera at arm's length. Those details remain a matter of feel, close up video or a coach.

Benefits of throw analysis for your training

The most obvious benefit is objectivity. You find out what your technique really does, not what you think it does. That saves time because you are no longer groping in the dark. Instead of working on the wrong thing for months, you get a concrete focus.

Another benefit is traceability. mydart stores your data and lets you compare over time. You see whether your elbow angle has stabilised over the last few weeks or whether your follow-through is improving. A value like "elbow angle 142 degrees" never stands alone, but always next to your own average.

You can also analyse your throws without always having a coach at your side. You train alone but still get concrete feedback. That makes technique training more flexible and independent.