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A radar gun reads speed and spin. PitchLab also shows how the ball moved.
Spin axis, movement, location, and Stuff+ on every pitch, with video, from an iPhone on a tripod, from $12.50 a month. Here’s what each one measures and costs.


Stalker’s Pro 3s radar gun costs $2,899.99 and measures velocity and spin rate; the Pro 3 ($1,999.99) and Sport 3 Connect ($799.99) measure velocity. None measures movement or location. PitchLab measures all of that, plus spin axis, spin efficiency, and Stuff+, from an iPhone on a tripod, with video of every pitch, starting at $12.50 a month.
PitchLab on an iPhone next to a Stalker radar gun, a Pocket Radar, and a TrackMan, all measuring the same pitches.
PitchLab highlights
Co-founder Jake Fishman pitched for the Miami Marlins
Rated 4.7 stars from more than 2,100 ratings on the App Store
Comparable accuracy to expensive tools like TrackMan
Pitchers and coaches from Little League to MLB
What each one takes to get started: the hardware, the subscriptions, and the devices to run them.
First year$2,899.99+
Equipment to buyNone
| Feature | PitchLabiPhone app | StalkerPro 3s Radar |
|---|---|---|
| Price to start | starting at just$12.50/mo | $2,899.99Pro 3s, the model with spin |
| Ongoing cost | Just your planfrom $12.50 a month, or free | None requiredapp Premium is $49.99 a year |
| What you need | iPhone and tripod | Radar gun, plus a phone for video |
| Where it goes | Behind the pitcheron a tripod, facing home plate | In line with the pitchreadings drop off-angle |
| Setup | Under 2 minutesline up home plate on screen | Aim it, or mount it on a tripod |
| Video of every pitch | Built in, up to 4Ktrimmed, with stats and ball tracking | In the Stalker phone appspeed and spin on the clip |
| Velocity | ||
| Spin rate | ||
| Spin axis and efficiency | ||
| Seam orientation | ||
| Movement(IVB and horizontal break) | ||
| Pitch location | ||
| Stuff+ |
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PitchLab has been downloaded more than 200,000 times and is rated 4.7 out of 5 from more than 2,100 ratings on the App Store. Here’s what a pro pitcher, a training facility, and a parent who coaches wrote.
“An absolute game changer.”
“This app is an absolute game changer. I’ve witnessed countless pitches captured amongst all different types of pitchers and the accuracy is incredible.”
PitchLab App Store review by JohnnyWest34
“The metrics are impressively accurate.”
“The metrics are impressively accurate — they line up closely with the readings we get from the tracking systems we normally use at our baseball facility.”
“I went into it skeptical.”
“I think the data on ball spin and the ability to watch the pitch with stats is incredible. I went into it skeptical and thinking the subscription was a bit steep. I don’t believe that anymore.”
Both measure the velocity of every pitch. A radar gun reads the ball’s speed directly, and Stalker’s manual notes that it reads low when it’s off the line of the pitch, which the Pro 3 models correct for. PitchLab measures velocity from video, and set up as recommended, its results are comparable to TrackMan’s. The video above shows PitchLab next to a Stalker, a Pocket Radar, and a TrackMan on the same pitches.
The Pro 3s ($2,899.99) measures spin rate; Stalker’s other handheld radars measure speed. None of them measures spin axis, movement, or location. PitchLab measures all of those, plus Stuff+, from an iPhone.
On Stalker’s website, the Sport 3 Connect is $799.99, the Pro 3 is $1,999.99, and the Pro 3s with spin is $2,899.99. The app’s Premium tier is $49.99 a year. PitchLab is free to start, and plans start at $12.50 a month.
A radar gun has to point along the ball’s path and reads low when it’s at an angle. PitchLab’s iPhone sits on a tripod about 2 feet behind the pitcher, at least 5 feet high, facing home plate.
For pitchers and coaches who want more than speed and spin, PitchLab is the most complete alternative: velocity, spin, spin axis, movement, location, and Stuff+ on every pitch, with video, from an iPhone.
Download PitchLab free on the App Store. Set up your phone and tripod, throw, and get pro-grade numbers before the next pitch.