Comparison

UltraTrainer vs Slip Shadowboxing

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

Head to head
About

UltraTrainer

This app offers a revolutionary interval timer with traditional and randomized action intervals. It acts as a virtual coach, calling out exercises or actions at random times to improve reflexes and reaction speed for various training disciplines.

Highlights
  • Traditional interval timer
  • Randomized action intervals
  • Virtual coach functionality
  • Timer Exchange community
  • Timer Group sequencing
  • Direct timer sharing
Features
Read full description

Description UltraTrainer is your virtual coach, trainer, and training partner. It is a revolutionary timer which was not available previously on any mobile device. There are two types of intervals which can be mixed in UltraTrainer: - Traditional Intervals - Randomized Action Intervals In a traditional interval, the interval is a specified duration. This is what you would normally expect from an interval timer. Routines such as Tabata, HIIT, etc, are incredibly easy to setup and modify. The Randomized Action Intervals is where UltraTrainer truly breaks new ground. UltraTrainer will call out Actions for you to perform in random order AND at random times that you control. For example, if you are shadow boxing or hitting the heavy bag, you would normally think of a combination of punches and throw them. Instead of consciously coming up with the combination, UltraTrainer can tell you what punches to throw. It can call out 'JAB!', then a second later 'JAB CROSS!', then a second and a half later, 'CROSS HOOK!', until the interval ends. This is how UltraTrainer can be your virtual coach/trainer/training-partner: you can not train reactionary reflexes without somebody or something telling you what to do in random order and at random times. Martial artists can work on reflexes by creating timers that randomize movement ("Forward!", "Backwards!") and actions ("Sprawl!"). Cyclists can simulate mountain road courses by setting up intervals that randomize pedaling speed. Crossfit athletes make HEAVY use of timers for quick high-intensity workouts. The sample timer "Fight Gone Horribly Wrong" is based on "Fight Gone Bad" but with a twist. Each of the 5 stations is called out in random order and the duration at each station is randomized between 20 seconds and 1 minute. The result? A franticly paced workout because you never REALLY know when the next station will be called out so you have to try to completely exert yourself at the current station. For a complete workout, you can set up a Timer Group which will play individual timers back to back. Start out with your favorite Warm Up timer, then run through your favorite Training timer, and end with a Stretching timer. UltraTrainer will run you through your full workout automatically. Exclusive to our products, users can browse the Timer Exchange, a community where people freely exchange timers. Search, browse, and download timers that other users have uploaded. If you want, you can upload your own timers to share with others. You can also trade timers directly with a friend using E-mail, or the clipboard to transfer them other ways. UltraTrainer can be used for martial arts, mma, boxing, bjj, circuit training, interval training (Tabata, HIIT), Crossfit, yoga, meditation, cycling, running / sprinting, swimming, time-management, multi-stage recipes for cooking, weight lifting, stretching, and anything else you might be able to think of. As you can see, UltraTrainer can be used in all sorts of situations. Features in UltraTrainer: - Timer Exchange community - Runs in the background - Random interval actions - Copy/Paste Intervals and Actions - Rearrange intervals - Delayed start time - Over 70 included sounds - Record your own sounds - Large portrait or landscape countdown timer display - Help system explains each option on the current screen - iPod music playback control lets you pause/play the current track or move to the next track from the countdown timer screen - Pause the timer to temporarily halt the activity - Timer state is saved if interrupted - Will still run if screen is locked - Intuitive setup

About

Slip Shadowboxing

This app guides you through shadowboxing workouts using audio cues. It directs you to perform specific punches and defensive moves, sometimes indicating which side of your body to use.

Highlights
  • Audio-guided boxing moves
  • Left/right ear cues for side-specific actions
  • Simple, minimalist interface
  • Headphone-based instruction
  • Variety of boxing techniques
Features
Read full description

Simple, minimal, shadowboxing app. Put in your headphones. Press Start. Box. Audio cues will tell you which move to perform (e.g. cross, hook, slip). Sometimes moves will be played in your left or right ear. Perform the move on that side. For example, "hook" in your left ear means left hook. "Slip" in your right ear means slip right.

Screenshots

UltraTrainer4 screens
Slip Shadowboxing3 screens

Verdict

The call

The clearest difference is price: Slip Shadowboxing at Free against UltraTrainer's $2.99. Slip Shadowboxing also leads on rating (5.0 vs 3.9) and update cadence (every 5 days vs monthly). UltraTrainer's advantage is in-app purchases (none vs 1) and ratings volume (9 vs 2). On 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

Slip Shadowboxing is free to download; UltraTrainer costs $2.99 up front. Slip Shadowboxing sells 1 one-off in-app purchase. UltraTrainer asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Slip Shadowboxing holds the better App Store score, 5.0 against 3.9. Both are backed by a comparable volume of ratings — 9 and 2 respectively.

UpkeepUpdate frequency

UltraTrainer ships an update monthly, Slip Shadowboxing every 5 days. The most recent releases landed on October 29, 2026 and October 21, 2026 respectively.

Scorecard7 real differences · 3 level
UltraTrainer versus Slip Shadowboxing: the parameters behind the verdict, then further details
ParameterUltraTrainerSlip Shadowboxing
Price$2.99Free — better
Rating3.9 (9 ratings)5.0 (2 ratings) — better
Positive reviews56.0% of reviews—
Number of ratings9 — better2
Update frequencyMonthlyEvery 5 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS8.0 — better13.4
Further details — not scored
Size21 MB65 MB
Age rating4+4+
DeveloperPlain and Simple SoftwareHans Yadav

Customer experience

UltraTrainer

All ratings9 ratings
Positive66.7%
Neutral22.2%
Negative11.1%
Written reviews75 reviews
Positive56.0%
Neutral14.7%
Negative29.3%

Slip Shadowboxing

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

UltraTrainer

Reported bugs

29 issues
  • Crashes when recording audio
  • App closes when trying to add new drills
  • Unlabeled buttons in timers (Voiceover issues)
  • Bug preventing setting time for actions
  • Minute and second parts go to zero
Show 24 more
  • Preloaded programs set intervals to zero
  • Minimum/maximum duration goes to 0
  • Randomized intervals not working as described
  • App opens in portrait on iPad when landscape
  • No final buzzer or alarm
  • Unable to write in exercise title/description boxes
  • Glitchy with sound levels
  • Crashing and multiple glitches after update
  • Cannot access stored routines after upgrade
  • Crashes immediately after update
  • App crashes on iPod 4
  • App crashes on iPhone 6 or iPad Air
  • Broken on iPod running iOS 6
  • No longer works with iOS 6
  • Cannot add new timers or pictures after update
  • Change old timers not working after update
  • App crashes a lot
  • Music dimming issues
  • Bluetooth export/import not working
  • App slows down and refuses to open with large timers
  • Pause is broken, crashes on resume
  • Music volume control is random
  • Sound unreliable, often not playing after 15 min
  • Crash when pausing and resuming

Requested features

24 requests
  • Apple Watch support
  • Text-to-speech functionality
  • Connect to Apple Music
  • Fix orientation issues
  • Add round numbers at start of each round
Show 19 more
  • Specify attack rounds
  • Integrated heart rate monitor
  • Dark mode option
  • Advanced analytics dashboard
  • Easier deletion of actions/intervals
  • Lock orientation
  • Global on/off for sounds
  • Allow repetitions of Actions
  • Portrait and landscape mode for the application itself
  • Respond to emails
  • Color picker for background colors
  • Stopwatch with delayed timer
  • More boxing/kickboxing workouts
  • Pre-loaded or downloadable total body workouts
  • Easier insertion of actions/intervals
  • Use custom sounds from sound files
  • Built-in training log
  • Include individual pics or video clips in actions
  • Larger buttons

Slip Shadowboxing

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

UltraTrainer

No in-app purchases

1 purchases

Slip Shadowboxing

One-time1
  • Pro$9.99

Questions

Is UltraTrainer free?
UltraTrainer costs $2.99, with no in-app purchases.
Is Slip Shadowboxing free?
Slip Shadowboxing is free to download, with in-app purchases available.
Which has better reviews, UltraTrainer or Slip Shadowboxing?
Slip Shadowboxing is rated higher. UltraTrainer averages 3.9 out of 5 from 9 ratings, while Slip Shadowboxing averages 5.0 from 2 ratings.
Do UltraTrainer or Slip Shadowboxing have ads?
Neither UltraTrainer nor Slip Shadowboxing shows ads.
Which is updated more often, UltraTrainer or Slip Shadowboxing?
UltraTrainer ships an update monthly, and Slip Shadowboxing every 5 days. Most recently, UltraTrainer was updated on October 29, 2026 and Slip Shadowboxing on October 21, 2026.

Other comparisons