Round 1The rounds
WJabster
Never repeat. A new draw from the combo library every start.
A bag timer
Same round on loop.
Pre-launch / iOS first, Android soon
Like having a trainer in your pocket.
Jabster runs the round like a real trainer. It calls every combo out loud over your own Spotify or Apple Music, and the work changes each session so it never goes stale. Bag, shadowbox, or rope.
Founding 500. Claim your spot before launch.
0 repeated roundsYour musicAny gearFree to start
1Jab
2Cross
3Lead hook
Slip
Same round. Again.
Never the same round.
The reason you quit last time
Session 01Jab · Cross · Hook
Session 01 · fresh drawJab · Jab · Cross · Slip
AgainSession 02Jab · Cross · Hook
Session 02 · fresh drawCross · Lead hook · Roll
AgainSession 03Jab · Cross · Hook
Session 03 · fresh draw1 · 2 · 3 · 2
AgainSession 04Jab · Cross · Hook
Session 04 · fresh drawJab · Cross · Lead uppercut
AgainSession 05Jab · Cross · Hook
Session 05 · fresh drawDouble jab · Cross
AgainSession 06Jab · Cross · Hook
Session 06 · fresh drawSlip · Cross · Hook
AgainSession 07Jab · Cross · Hook
Session 07 · fresh drawJab · Rear uppercut · Hook
AgainSession 08Jab · Cross · Hook
Session 08 · fresh drawPivot · Jab · Cross
AgainSession 09Jab · Cross · Hook
Session 09 · fresh draw1 · 1 · 2 · Slip · 2
AgainHow it works
Three sliders, then the bell.
No setup marathon. Scroll through one round.
01 / PICK
Time, gear, intensity.
Pick 15 minutes, mixed bag, beginner. Every input shapes the round that gets built. Three sliders and you are done.
02 / START
Rounds, length, rest. Hit start.
Crisp bells and cues keep you honest while you throw. No volume war with your playlist.
03 / THROW
Every combo, said out loud.
The trainer calls the sequence over your own Spotify or Apple Music. You throw, the clock runs, the bell ends it.
04 / LEARN
Do not know a slip? Tap it.
Every move the coach calls has a short tutorial. Beginner to advanced, three rounds or twelve.
Build your round
Just you and the clock
3:00
Jab · Cross · Hook
Set it and box.
Scroll to run the round. A real bell, a warning beep, and a coach in your ear until it rings.
The habit, not the hype
Watch the streak stack up.
Every round you finish lands on the board. The streak is the point. Show up, throw, and let the squares fill in.
0Workouts
0Day streak
0Total min
Sample profile from the app. Your board starts empty.
Tale of the tape
Why fighters are waiting on it.
No fake reviews. No thousand-user badge. Here is the honest case, built in public. Five rounds, scored as you scroll.
Round 2The coaching
WJabster
Every combo called out loud.
A bag timer
A beep.
Round 3The music
WJabster
Your Spotify or Apple Music, cues laid over it.
A bag timer
Stock loop or silence.
Round 4The gear
WJabster
Heavy bag, shadowbox, or rope.
A bag timer
Timer only.
Round 5Who you hear from
WJabster
A real founder, shipping in public.
A bag timer
A marketing team.
Free tools
Try the boxing brain right now.
The same engine that runs the app powers these. No account, no catch.
4-week program builder
A personalized, periodized plan with daily sessions, combos, and a progress benchmark.
Open the tool →Combo generatorA full workout of never-repeating combos you can read off and throw right now.
Open the tool →Round timerA real bell, a warning beep, and combo callouts said out loud every round.
Open the tool →Glove size calculatorYour body weight and training use, turned into the right ounce gloves to buy.
Open the tool →Punch number decoderPaste a punch-number sequence and get the punch names, hand, and type behind each number.
Open the tool →Heavy bag size calculatorYour body weight, goal, and mount, turned into the right bag weight to buy.
Open the tool →Workout-plan quizFour questions and a seven-day plan built for your gear and your goal.
Open the tool →Technique libraryEvery punch, slip, and roll, with the cue the coach uses for it.
Open the tool →Punch number decoder
Paste a punch-number sequence and get the punch names, hand, and type behind each number.
Open the tool →Heavy bag size calculatorYour body weight, goal, and mount, turned into the right bag weight to buy.
Open the tool →Workout-plan quizFour questions and a seven-day plan built for your gear and your goal.
Open the tool →Technique libraryEvery punch, slip, and roll, with the cue the coach uses for it.
Open the tool →4-week program builderA personalized, periodized plan with daily sessions, combos, and a progress benchmark.
Open the tool →Combo generatorA full workout of never-repeating combos you can read off and throw right now.
Open the tool →Round timerA real bell, a warning beep, and combo callouts said out loud every round.
Open the tool →Glove size calculatorYour body weight and training use, turned into the right ounce gloves to buy.
Open the tool →30-day challenges
Fight for the first belt.
Thirty days, one leaderboard, the whole squad throwing. Finish and the accolade lives on your profile.
#1Champion belt. Finished first on the leaderboard in a 30-day challenge.
TOP 3Podium gloves. Finished in the top three.
ALL 30Every day on the board counts toward your streak.
Boxing guides
Learn the gear and the technique.
FAQ
Frequently asked questions
When does Jabster launch?
Still in the gym, not the App Store yet. iOS comes first, Android right behind it. Leave your email and we'll send one note the day it goes live. Nothing in between.
Do I need a heavy bag?
No. Shadowbox mode needs nothing but space, and rope mode needs a rope. The bag is one of three ways to train, not the price of entry.
Can I really use my own music?
Yes, and you should. Start your Spotify or Apple Music, open Jabster, and the cues play on top. Your playlist, our coaching, no volume war.
How is this different from a round-timer app?
A timer tells you when. Jabster tells you what to throw, the whole way through. It builds the combo, calls it out loud over your music, and never gives you the same round twice.
Is there a free version?
Yes, for real. Free to start, not a seven-day trap that asks for a card up front. You get real rounds on the free tier, and we'll share the rest closer to launch.
Final bell
Be first in the ring.
A million-plus people already train with a bag-timer app. The habit is proven. Jabster is the better-built version. Drop your email and you will hear from me the day it hits the App Store.
Founding 500. Claim your spot before launch.
iOS first, Android soon. Free to start. No spam in between.