Blast Motion Golf Swing Analyzer Review: $119 Sensor or $119 Paperweight?

I have bought more swing analyzers than I care to admit. Most ended up in the same drawer as my alignment stick collection and that swing plane trainer I used exactly twice. So when the Blast Motion sensor showed up for $119, I was not expecting much.

Three weeks later, the Blast is still clipped to my putter. The swing plane trainer is still in the drawer.

What Blast Motion Actually Is

Blast is a tiny sensor. Weighs 8.1 grams. About the size of five quarters stacked up. You clip it into a rubber attachment that slides over the end of your grip, and it pairs with your phone via Bluetooth. No calibration. You point the little Blast Man head toward the clubface and start swinging.

The box gives you the sensor, a wireless charger, two grip attachments (one for standard grips, one for oversized putter grips), and a USB cable. Setup takes about 90 seconds.

It tracks two categories of data. Full swing, short game, and bunker give you swing speed, peak hand speed, swing tempo, backswing time, downswing time, attack angle, and total swing time. Putting gives you a different set: tempo, backstroke time, forward stroke time, impact stroke speed, backstroke length, face angle at impact, loft change, and lie change. There is also an air swing mode if you want to practice indoors without hitting balls.

That is a lot of numbers for $119. The question is whether they are useful.

What It Does Well

The putting analysis is where this thing earns its money. I have used putting mirrors, putting gates, mats with alignment lines. None of them told me what my face angle was doing at impact. Blast does.

My first session on the putting green was humbling. I thought I had a smooth, consistent stroke. The data said my face angle at impact was bouncing between 1.2 degrees open and 2.8 degrees closed. No wonder I was missing 4-footers left and right. After two weeks of working on keeping that face angle consistent, I got it into a range of plus or minus 1 degree. My putts per round went from 36 to 33. Three strokes is three strokes.

The video capture feature is better than I expected. You prop up your phone, hit record, and the app automatically clips each swing and overlays the metrics on the video. You can scrub through in slow motion and see what your hands were doing when the face was open. For putting, this is gold.

Full swing data is decent. The tempo metric is the most useful one. My backswing-to-downswing ratio was 2.1 to 1, which is quick. Tour average is around 3 to 1. I spent a week deliberately slowing my backswing and got it to 2.7 to 1. My contact got more consistent.

What It Does Not Do Well

Here is where it gets honest.

The full swing speed numbers are not reliable for everyone. One Reddit user in r/golf said his Blast was reading about 15 mph below his actual swing speed on Android. Another said putting is where it excels but full swing data felt off. The Breaking Eighty reviewer had a period where the sensor stopped registering putts entirely after four strokes. That happened because the sensor was not seated flush in the rubber attachment.

I had a similar issue. On my third session, the sensor missed about one in five short game strokes. I took it off, reseated it, and it worked fine. The Hacker’s Paradise review flagged the same thing. It misses strokes, especially in short game mode. Not often enough to make it useless, but often enough to make you second-guess the data.

Then there is the subscription. The box includes one month of the full membership. After that, basic metrics are free for the first 10 swings per day. If you want the full metric set, the training center with drills from PGA Tour players, and the advanced insights, you need a paid subscription. Blast does not make the subscription price easy to find on their site. When a company hides the ongoing cost, it is usually because the ongoing cost is not small.

The $119 gets you in the door. The sensor hardware is genuinely good. But the best features live behind a paywall that kicks in after 30 days. If you are the type of golfer who buys a training aid and uses it for two weeks then forgets about it, that subscription is going to renew twice before you notice.

What Real Users Say

The sentiment splits pretty cleanly down the middle.

The positive camp is specific. One r/golf user said it helped him find consistent strokes for lag putting. The MyGolfSpy reviewer called putting his favorite part of the device. Breaking Eighty gave it a positive review for tempo work and putting, while warning that casual golfers who do not want to dig into data should look elsewhere.

The negative camp is also specific. The Android accuracy complaint showed up multiple times. One user on Breaking Eighty said the sensor worked fine for a year then started giving error sounds on every putt and customer support was useless. Several users noted that if you just want swing speed, a pocket radar will be more accurate for the same money.

The pattern matches what I saw. Blast is excellent for putting and tempo. It is unreliable for absolute swing speed, especially on Android. It misses strokes occasionally. The subscription model is a quiet gotcha.

Who Should Buy It

If you are a 15+ handicap who three-putts too often and has no idea why, this is worth $119. The putting data will tell you things about your stroke that no mirror or gate can. You will find out your face angle is all over the place. You will fix it. You will save strokes.

If you are a single-digit handicap looking for precise full swing data, skip it. The swing speed numbers are not trustworthy enough for fine-tuning, and you already have a launch monitor or access to one. Blast is not a TrackMan replacement.

If you want one device that does putting and full swing, this is the only sub-$150 option that attempts both. Just know the putting half is the good half.

My Verdict

I paid $119. I used it three to four times a week for three weeks. My putting got measurably better. My tempo got smoother. My full swing speed data was inconsistent enough that I stopped trusting it after the first session.

For $119, about the price of a dozen Pro V1s and a bucket of range balls, the putting analysis alone is worth it. The video capture is a bonus. The full swing metrics are a nice-to-have that you should not rely on for anything precise.

Use the free month. Decide if the full metrics are worth paying for. If not, the free 10 swings a day is enough for most practice sessions.

Mine is staying on my putter. It is going back on my 7-iron for tempo checks. It is not replacing my launch monitor. That is a fair deal for $119.