Comparison

RoundFlow vs Shadow Box

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

RoundFlow

This app provides a customizable interval timer for various combat sports and fitness routines. It seamlessly integrates with music apps, allowing your playlist to continue uninterrupted during workouts. Features include coach voice prompts, combo calls, and workout tracking.

Highlights
  • Music integration with Spotify, Apple Music, YouTube Music
  • Customizable round, rest, and warm-up/cool-down timers
  • Recorded coach voice and combo callouts
  • Workout tracking with calendar and streaks
  • Apple Watch companion app with haptic feedback
  • Workout art generation for social sharing
  • Group session synchronization
Features
Read full description

RoundFlow is the round timer you can pay for once and keep forever, and it doesn't kill your music. It keeps timing with the screen locked, ducks your music for the bell, then hands the volume straight back. Start Spotify, Apple Music or YouTube Music, hit START, lock the phone and train. Your playlist never stops. A COACH IN YOUR CORNER • A real recorded coach voice calls your rounds, rests and the final "3-2-1" • Combo calls shout live combinations — "Jab, cross, hook!" • Bell, coach voice and haptics — or switch to a built-in system voice INTERVALS INSIDE THE ROUND • Split any round into hard and easy bursts — 10 seconds hard, 10 seconds pace, nine times, inside a 3-minute round • The bell still means the round. The switches are a short tick, high going in hard, low going easy — not 200 bells a session • The ring turns amber while you ease off, so you can read it from across the gym without counting • A longer break every fourth or eighth round, on top of the normal rest • One toggle and three numbers to set up, or start from a ready-made Burst Rounds, Sprint Rounds or Long Session HANDS-FREE WHEN THE GLOVES ARE ON • Hold a hand over the top of the phone for a second to pause, and again to carry on • Or say "Pause RoundFlow" to Siri — no glove comes off either way BUILT FOR EVERY ROUND • Boxing, Muay Thai, MMA, kickboxing, taekwondo, karate, CrossFit, HIIT, Tabata, sprints & running • Two custom profiles free, unlimited with Pro: rounds, round time, rest, warm-up, cool-down and warning • A big, glanceable timer ring you can read from across the gym RUN & SPRINT • Roadwork — a GPS run tracker built for fighters: distance, pace, kilometre splits and a goal for the session • Sprints — interval sprint sessions with the same bell, coach voice and rest countdown as your rounds • Every run lands in the same training log as your rounds MADE TO SHARE • Workout DNA — every session draws a one-of-a-kind piece of art from your training, ready for Instagram Stories • Your RoundFlow Year — a Wrapped-style recap of everything you've put in • Challenge a friend — send any workout as a link, then compare your scores TRAIN TOGETHER • Group sessions in perfect sync — everyone hears the bell at the same moment • Present mode — mirror the timer to a TV or projector for the whole class TRAIN WITHOUT LOOKING • Live Activity & Dynamic Island keep the round live on your Lock Screen • Apple Watch companion — a haptic on every bell, plus live heart rate, punch count and Effort Score. Leave the phone in your bag • Runs in the background with the screen off TRACK YOUR WORK • An automatic training log of every session, with a calendar and streaks • Stats: total workouts, time on the mat, weekly activity and trends • Earn belts and badges as you put in the rounds RoundFlow Pro unlocks unlimited profiles, the recorded coach voice and combo calls, the full Apple Watch experience (heart rate, punch tracking and Effort Score), group hosting, and complete stats and trends. Try Pro free for 7 days, or unlock everything forever with a one-time Lifetime purchase. The only timer that lets your music play. Ring the bell. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://zakin02.github.io/roundflow/privacy.html

About

Shadow Box

Features
Read full description

Shadow Box turns solo boxing practice into focused, voice-guided rounds. Choose a structured workout, set your coach voice and pace, and train with clear numbered punch calls, combinations, footwork, and defensive movement. Whether you are learning the six basic punches or building longer championship-style rounds, every session gives you a purpose. TRAIN WITH A VOICE COACH • Hear round instructions, numbered punches, and complete combinations • Choose from natural coach voices • Adjust and save your preferred call speed • Follow preparation cues, five-second countdowns, and timed rounds • Pause automatically when you lock the screen or switch apps CURATED SHADOW BOXING • Beginner, intermediate, and advanced sessions • Movement, defense, conditioning, HIIT, and style-study workouts • Warm-up routines designed for boxing practice • Clear workout summaries and calorie estimates • Build custom rounds with your own timing and pace • Follow four-week plans with 10, 20, or 30 minute session targets LEARN THE TECHNIQUE • Stance and all six punch fundamentals • Footwork, slips, rolls, catches, parries, and pivots • Curated YouTube instruction inside the app • Open a technique during a paused workout, then return where you left off TRACK YOUR WORK • Record completed and partial workout calories • Review today and weekly training totals • Save favorites and workout pace preferences No separate Shadow Box account is required. Your workout history and preferences remain on your device. Shadow Box provides general fitness education, not medical advice or a replacement for qualified in-person coaching. Use a clear space, train at a controllable speed, and stop if you feel pain, dizziness, chest pain, loss of balance, numbness, or unusual shortness of breath. SHADOW BOX PREMIUM Access to Shadow Box requires Shadow Box Premium Monthly. Eligible new subscribers receive a 3-day free trial, then US$2.99 per month (prices vary by region). The subscription renews automatically unless canceled at least 24 hours before the trial or current period ends. Payment is charged to your Apple Account. Manage or cancel in Apple Account Subscriptions. Privacy Policy: https://shadow-box-support.bart2819.chatgpt.site/privacy Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

RoundFlow4 screens
Shadow Box4 screens

Verdict

The call

The clearest difference is in-app purchases: Shadow Box at none against RoundFlow's 3. Shadow Box also leads on iOS requirement (15.1 vs 17.0). RoundFlow's advantage is update cadence (every 11 days vs monthly). On price, ads and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. RoundFlow sells 3 in-app purchases, starting at $2.99 per month. Shadow Box asks for nothing beyond the download.

UpkeepUpdate frequency

RoundFlow ships an update every 11 days, Shadow Box monthly. The most recent releases landed on October 10, 2026 and October 13, 2026 respectively.

Scorecard3 real differences · 6 level
RoundFlow versus Shadow Box: the parameters behind the verdict, then further details
ParameterRoundFlowShadow Box
PriceFreeFree
Rating5.0 (2 ratings) — better—
Number of ratings2 — better—
Update frequencyEvery 11 days — betterMonthly
AdsNoNo
In-app purchasesYesNo — better
MonetizationFreemium—
DevicesiPhone, Apple WatchiPhone, iPod
Requires iOS17.015.1 — better
Further details — not scored
Size11 MB149 MB
Age rating4+4+
DeveloperZakaria ElkassmiSALMAN AHMED

In-app purchases

3 purchases

RoundFlow

Subscriptions2
  • RoundFlow Pro (Monthly)$2.991 Month
  • RoundFlow Pro (Yearly)$7.991 Year
One-time1
  • RoundFlow Pro (Lifetime)$24.99
None

Shadow Box

No in-app purchases

Questions

Is RoundFlow free?
RoundFlow is free to download, with in-app purchases available.
Is Shadow Box free?
Shadow Box is free to download, with no in-app purchases.
Do RoundFlow or Shadow Box have ads?
Neither RoundFlow nor Shadow Box shows ads.
Which is updated more often, RoundFlow or Shadow Box?
RoundFlow ships an update every 11 days, and Shadow Box monthly. Most recently, RoundFlow was updated on October 10, 2026 and Shadow Box on October 13, 2026.

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