Reaction Speed
Randomized visual cues train the split-second first step. Every tap is timed to the millisecond so you can see yourself getting quicker.
Digaball App · Reaction Trainer
Volleyball Reaction Trainer
Faster hands. Sharper reads. Train the split-second reactions that win rallies — anywhere, between sessions. Sport-specific drills built by Coach Duke over 35 years on the sand and in the gym.
Coming soon · Free to download · Pro unlock $4.99
35+
Years of coaching, in your pocket
1min
A session — train between reps
3-way
Left · Center · Right reads
FREE
To download and start playing
Why it works
Built to make you faster.
Hand-Eye Control
Read the ball off the hitter and commit — left, center, or right. Every rep sharpens the eyes-to-hands link that turns a scramble into a clean pass.
Court Reads
You react to real footage of a live swing — not an abstract dot — training the anticipation that gets you to the ball early.
Progress Tracking
Every rep logs your reaction time and accuracy, and the Stats screen keeps your bests. Hit milestones to prove — in numbers — that you're getting quicker.
Normal & Faster
Run the Normal series, then switch to Faster when you're ready for less time to read. Arcade, Unlimited, and Training modes stack the pressure so you're always at your edge.
Coach-Built
Every drill is designed from real coaching — national-title indoor and top-50 sand experience — not a generic reaction game reskinned for volleyball.
Inside the app
See it. Decide. Move.
Two challenge speeds
Pick your challenge
Start with the Normal series — three directional reactions, left, center, and right. Step up to Faster when your hands are ready for less time to read.
- Normal & Faster series — same reads, less reaction time
- Three-direction reads: Left · Center · Right
- See · Decide · Move — commit only once you've read it
Three ways to play
Choose how you play
Every challenge runs in the mode that fits your session — chase a high score, train free-form, or run a quick fixed set right before you compete.
- Arcade — combo scoring, chase the record
- Unlimited — keep going as long as you like
- Training — a short fixed set to find your timing
Timed to the millisecond
Proof you're getting quicker
The app times every read to the millisecond, so improvement isn't a feeling — it's a number on the screen. Watch your reaction time drop and your accuracy climb, rep after rep.
- Reaction time in milliseconds on every rep
- Live score and combo multiplier
- Running accuracy so you know what to fix
Get started in a minute
How it works.
01
Pick a challenge
Choose Normal or Faster, then a mode — Arcade, Unlimited, or Training — to match your session today.
02
React fast
Targets fire across the court. Tap the moment you see them — the app times you to the millisecond.
03
Track & climb
Log your times, beat your best, and unlock milestones as you climb. One minute a day adds up fast.
Free to play · Pro when you're ready
Start free.
Upgrade when your numbers mean something. Play Arcade free for as long as you like.
When you want to know whether you're actually getting faster, that's Pro: tracked reps, your trend over time, your fastest dig in every direction, and see your progression.
Free to play
Free
$0To download and play Arcade
- Arcade Classic — unlimited replays
- The Normal challenge
- A share card for every run
- One Coach Duke line per run
- Your fastest dig, in milliseconds
One-time unlock
Volleyball Reaction Trainer Pro
$4.99One time · no subscription · no ads
- Skill Builder — tracked reps, trend and streak
- Progressive Arcade — 3 strikes, speed ramps
- Unlimited — train with no round limit
- The Speed challenge
- Coach Duke's full commentary
- Achievements and Dig Animations
- Advanced HUD and Speed pacing
- No upgrade prompts
The entire Pro version — one price. No ads. No subscription.
From Coach Duke
The players who win the scramble are the ones who react first. Now you can train that anywhere.
Anthony “Coach Duke” Duke · 35+ years · National Gold 2000
Good to know
Questions.
Who is the Reaction Trainer for?
Any volleyball player who wants faster hands and sharper reads — indoor or beach, club athlete to weekend competitor. Normal and Faster speeds meet beginners and advanced players where they are.
Do I need any equipment?
No. All you need is your phone. Drills are designed to be done anywhere — at home, in the gym, or courtside between reps.
How much does it cost?
The app is free to download — play Arcade as much as you want. A one-time $4.99 unlocks Volleyball Reaction Trainer Pro: tracked stats and trends, Skill Builder, Progressive Arcade, Unlimited, the Speed challenge, and more. No subscription, no ads.
When is it available?
The app is coming soon to iOS and Android. Add your name to the early list and we'll notify you the day it drops.
Does it really improve on-court performance?
Reaction training is a proven science. What we focus on is closing the gap from when a player sees an event to when the body reacts to it. Reducing that time can help a player get to, control, or make a play on the ball.
Is there research on reaction training?
There's a growing body of independent, peer-reviewed work on reaction-training methods in young athletes — light-based systems, exergames and stroboscopic training. We've summarized it in plain language, including what it doesn't show. Those studies looked at other systems and did not test this app. Read the research summary →
Be first on the court
Get faster. Get the app.
Volleyball Reaction Trainer is coming soon to iOS and Android — free to download, with a one-time $4.99 Pro unlock. No subscription, no ads. Join the early list and we'll let you know the moment it's live.
Prefer to train in person? Book sand training with Coach Duke →