You can't improve what you don't measure — and you can absolutely ruin practice by measuring it wrong. Velocity tools now run from $30 phone apps to $500+ professional radar, and the right choice depends less on budget than on what number you're actually chasing. Here's the landscape.
What You're Measuring, and Why It Matters
Pitch velocity is the classic radar number — how hard the pitcher (or machine) throws. Exit velocity — ball speed off the bat — is the hitter's number, and the single most honest measure of contact quality in a cage. Bat speed and swing metrics come from bat sensors rather than radar. Decide which number drives your training before buying the tool, because devices specialize.
The Tool Tiers
Pocket radar devices ($100–$400)
Pocket Radar's product line made real radar portable and affordable, and this tier is the sweet spot for families: accurate within a tick or two, works for both pitch and exit velocity, fits in a bag. The premium models add hands-free continuous mode — worth it, because someone holding a radar gun isn't coaching.
Professional radar guns ($500–$1,500+)
Stalker-class guns are the scouting standard: longer range, faster capture, better readings through screens. Overkill for a backyard cage; correct for programs and serious recruiting videos.
App and sensor systems ($30–$500/yr)
Phone apps estimate velocity from video or audio — free-to-cheap and fine for tracking trends, less reliable for absolute numbers. Camera/sensor platforms in the Rapsodo class add spin, launch angle, and full flight data at facility prices; you'll meet them at training centers more than homes.
Using the Numbers Without Wrecking the Hitter
Two rules keep measurement useful. First, measure sessions, not swings — a session's best five exit velocities tracked weekly is signal; reacting to every reading is noise that makes players sell out mechanics for the gun. Second, pair every number with a quality standard: exit velocity on line drives counts, while a 90 mph rollover to shortstop is still an out. When the trend flattens, the fix is usually mechanical, not motivational — our guide to the five most common swing flaws maps flat velocity trends to their root causes.
Measure Somewhere Worth Measuring
Exit-velocity sessions want consistent conditions: same balls, same feed, room for full flight. A private cage is ideal — book one nearby with space and a machine, bring the radar, and run the same 25-swing protocol monthly. Consistent protocol is what turns a $150 gadget into a development tool; here's how booking works if you're new to CageList.
A Monthly Protocol That Makes the Numbers Mean Something
Data helps when it's collected the same way every time. Once a month, run this exact sequence: same cage, same ball type, same feed (tee, or machine at a fixed speed), radar in the same position. Twenty-five swings after a full warm-up. Record the top five exit velocities and the average of all twenty-five — the top five tracks ceiling, the average tracks consistency, and the gap between them tracks swing efficiency. Write all three down with the date. That's the entire protocol, and its value is entirely in the sameness: a hitter who "gained 3 mph" under identical conditions actually gained it, while a reading from a different cage with different balls is a coin flip. Over a season the three-line log answers the questions that matter — is the player trending, did the winter mechanical work transfer, and is fatigue creeping in mid-season — with more authority than any single spectacular number.
Frequently Asked Questions
Are phone radar apps accurate?
Good ones land within a few mph — fine for trends, shaky for absolute bragging rights. Dedicated radar is the upgrade when the exact number matters.
What exit velocity is good for my player's age?
Rough cage benchmarks off a tee: 50s at 10U, 60s by 12U–13U, 70s in JV years, 80+ varsity, 90+ recruit-level. Trend matters more than the table.
Can one device measure pitching and hitting?
Pocket-radar-style devices do both — position behind the catcher line for pitches, behind/beside the hitter aimed at contact for exit velocity.
Radar gun or bat sensor?
Radar measures the result (ball speed); sensors measure the cause (swing). Start with radar — it's cheaper and harder to misread.
