Combo coach — app 02
Build the combo. Let it call you out.
Callout is the round timer that actually drills you. Build your combinations, set your rounds, and it calls them out loud over the bell — your coach’s voice when you’re training alone.
Try it now
What it does
Combo builder
String together strikes — jab, cross, hook, teep, switch kick, elbow — into named combinations. Number them or call them by name, the way your gym does.
Audio callouts
During a round, Callout speaks your combinations out loud at the pace you set, so you react instead of reading a screen. Called in random order — never the same one twice in a row — so you can’t anticipate what’s coming.
Real round timer
Proper rounds, rest, and warning bells — 3-minute rounds, 1-minute rest, however you train. The timer and the coach in one app, not two.
Your combos, your pace
Set the gap between calls, pick exactly which combos are in the mix for this workout, and start from a preset — ring rounds, MMA rounds, or a conditioning block.
How it works
- 01
Build a few combinations once — name them, or just use numbers like your gym does.
- 02
Set your round structure (work, rest, rounds) and how often you want a call.
- 03
Hit start, put the phone down, and work. Callout runs the timer and calls the combos so you can keep your hands up and your eyes off the screen.
Pricing
Free. The whole app.
Callout is free, forever — every feature, no account, nothing sold. Open it in your browser and add it to your home screen.
- Round timer with audio callouts
- Unlimited combos
- Per-workout combo selection
- Voice, pace & bell cues
- JSON backup & export
- Works offline
- No account, no upsell
Works offline · your data stays on your device · no account · no data sold, ever.
Put it on your phone
No app store. Add it in three taps.
Callout installs straight from this page — no store, no account, no download queue. Once it’s on your home screen it opens full-screen, launches offline, and keeps your data far safer from the clear-outs browsers run on ordinary tabs.
iPhone & iPad
- 1Open this page in Safari and tap Share in the toolbar.
- 2Scroll down the list and choose + Add to Home Screen.
- 3Tap Add. Callout gets an icon and opens full-screen.
Android
- 1Open this page in Chrome and tap Install when it offers.
- 2Or open the ⋮ menu and choose Add to Home screen.
- 3Confirm, and Callout behaves like any other app on your phone.
Questions
How is this different from a round-timer app?+
Round timers ring a bell. Callout drills you — it builds and speaks your actual combinations over the round so you’re reacting, not just counting time. That’s the part that’s been missing.
Does the audio work with my music?+
Callout speaks the combos through your phone’s built-in voice, so you can keep your own music playing underneath. On some phones the music dips or pauses for a moment while a combo is called — that’s your phone’s audio handling, not a setting in Callout.
Muay Thai and boxing both?+
Yes. The strike library covers boxing and Muay Thai (kicks, knees, elbows, clinch), and you can add your own names for how your gym calls things.
What does it cost?+
Nothing — Callout is free, the whole app. Open it in your browser and add it to your home screen; it works offline, no account. Try the live demo above first if you like.
The evidence
What the drills are built on
How a combo is called, in what order, and at what work-to-rest ratio aren’t arbitrary — they come straight from the motor-learning and conditioning literature.
Reacting to a called combo keeps your attention outward — on the target and the response, not your own limbs. An external focus of attention reliably improves motor learning and performance.
▸ ▾ The evidence
- Wulf (2013). Attentional focus and motor learning: a review of 15 years. International Review of Sport and Exercise Psychology, 6(1), 77–104. doi:10.1080/1750984X.2012.723728 ↗
The player mixes your combos in varied order rather than drilling one at a time. Interleaved practice feels harder but tends to improve retention and transfer — the contextual-interference effect.
▸ ▾ The evidence
- Shea & Morgan (1979). Contextual interference effects on the acquisition, retention, and transfer of a motor skill. Journal of Experimental Psychology: Human Learning and Memory, 5(2), 179–187.
The conditioning presets target specific energy systems with structured work-to-rest ratios, matched to the repeat-effort demands of combat sport.
▸ ▾ The evidence
- Hembrough et al. (2021). High-intensity conditioning for combat athletes: practical recommendations. Applied Sciences, 11(22), 10658. doi:10.3390/app112210658 ↗
Tiers mark how strong the evidence is — A (meta-analyses / RCTs), B (emerging), C (coaching practice, labelled, never dressed up as proven). The full method and bibliography live on the studio’s method page.
Callout · live
Want the coach in your pocket?
Callout is live and free. Open it, add it to your home screen, and it works offline — no account, nothing sold.