Comparison

FORM Swim vs RunWindow

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

Head to head
About

FORM Swim

This app acts as an underwater coach, providing real-time visual feedback through smart goggles to improve swimming technique and performance. It offers guided workouts, open water navigation, and detailed post-swim analysis, syncing data with popular fitness platforms.

Highlights
  • Real-time in-goggle coaching
  • Open water digital compass
  • Guided pool workouts
  • Workout generation from text
  • Comprehensive swim metric analysis
  • Automatic data syncing
Features
Read full description

Built for the FORM Smart Swim 1 and Smart Swim 2 Goggles. Your underwater coach gives you real-time visual feedback to get the most out of your swims and improve your swimming technique. 1. HEADCOACH™ - A revolutionary swim experience with in-goggle visual coaching coupled with comprehensive in-app analysis and educational resources. In the water, practice head pitch, head roll, and pacing to perfect your technique. Elevate your technique and improve your performance with real-time coaching. 2. SWIMSTRAIGHT™ - A one-of-a-kind digital compass helping you swim a straighter course in open water. Connect your goggles to a supported Apple Watch or Garmin smartwatch to get GPS-based metrics in open water. Alternatively, use the goggles independently for a unique open water experience. 3. GUIDED WORKOUTS - At the pool, let your goggles guide you through your swim with instructions and progress updates. No more paper, plastic bags or relying on your memory to know what to do next. 4. ALL YOUR SWIM TRAINING IN ONE PLACE - Choose between Plans and Workouts based on your swim goals. Work through a Plan structured to improve your swimming skills or swim and individual guided workout. 5. SCRIPT - INSTANTLY GENERATE WORKOUTS -
Transform your swim training with Script, FORM’s proprietary technology that instantly converts any written workout into a guided experience in your goggles. Whether you capture text with your phone’s camera or copy and paste it, Script brings your workouts to life. Plus, easily integrate workouts from platforms like TrainingPeaks and Tridot, or create custom sessions with our workout builder. 6. ANALYZE YOUR METRICS - Sync with the app to review each set out of the pool after every swim—and revisit past workouts to track your progress over time. You can share stats with your coach, too. Customize your goggles with metrics that are important to you. 7. YOUR DATA EVERYWHERE - Automatically sync your workouts with Strava, TrainingPeaks, Apple Health, TriDot, and Final Surge. Perfect if you're training for your next triathlon. The FORM Swim App works with the FORM Smart Swim 1 and Smart Swim 2 Goggles, the first wearable fitness tracker for swimmers and triathletes that shows metrics in real time on an augmented reality display. Learn more at www.formswim.com. Read more about our terms and conditions here: Terms of service: https://formswim.com/terms-of-service Privacy policy: https://formswim.com/privacy-policy

About

RunWindow

This app guides your runs using haptic feedback and on-screen cues to keep you within your target heart rate or pace zones. It focuses on training by feel, minimizing the need to constantly check your watch. View run trends and summaries post-workout.

Highlights
  • Haptic feedback for pace and heart rate zones
  • On-screen color cues for effort level
  • Adjustable pace or heart rate windows
  • Run trend and summary data
  • Apple Health integration
  • No account or phone app required
Features
Read full description

RunWindow taps you on the wrist when you drift outside the window you set, so you can run by feel without looking at your watch. Pick a target: a heart-rate range or a pace range. Then press Start, on your watch or your iPhone, and drop your arm. THREE CUES, NOTHING ELSE • Fast taps, nonstop: speed up • Slow taps, nonstop: ease off • One tap: you're back in range The cue tells you what to do, never which number moved, and it keeps going until you're back in your window. Hold a steady effort right on the edge and RunWindow stays silent. It waits for a real drift, not a wobble. ON YOUR IPHONE • Start on Apple Watch: one tap opens RunWindow on your wrist and starts the run • Tune your window on a drag-to-set track, lit green inside, warm above, cool below • Or set just a Max or a Min: one marker, cues on one side only • Quick heart-rate zones from your age, and your own saved windows • Every run in one place: time in window, the run drawn against your window, heart-rate zones, distance, pace and active calories. Delete any run you didn't mean to record • Settings sync both ways with your watch ON YOUR WATCH • Color Field turns the whole screen into the signal: green in range, warming toward red when you push too hard, cooling toward deep blue when you're too easy, with the word on screen so colour is never the only cue. Swipe up or down for a tick ring or a tuner. • Pause, resume, or change your window mid-run • Trend and Summary pages after every run • A one-minute demo shows every cue without running BUILT FOR TRAINING, NOT TRACKING • Heart rate streams live from the watch during the workout • Pace comes from GPS, smoothed so a single bad fix can't buzz you • Miles or kilometres • Every run is saved to Apple Health as a workout • No account, and no data leaves your devices RunWindow requires an Apple Watch: the cues are taps on your wrist. The watch needs Health access for heart rate and Location access for pace; the iPhone app reads your runs from Apple Health to show your history.

Screenshots

FORM Swim4 screens
RunWindow4 screens

Verdict

The call

The clearest difference is in-app purchases: RunWindow at none against FORM Swim's 5. RunWindow also leads on update cadence (every 3 days vs every 2 weeks) and rating (5.0 vs 4.7). FORM Swim's advantage is ratings volume (3.5K vs 1) and iOS requirement (15.0 vs 17.0). 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. FORM Swim sells 3 in-app purchases, starting at $14.99 per month. RunWindow asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

RunWindow holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: FORM Swim has 3.5K ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

FORM Swim ships an update every 2 weeks, RunWindow every 3 days. The most recent releases landed on October 23, 2026 and October 24, 2026 respectively.

Scorecard6 real differences · 4 level
FORM Swim versus RunWindow: the parameters behind the verdict, then further details
ParameterFORM SwimRunWindow
PriceFreeFree
Rating4.7 (3.5K ratings)5.0 (1 ratings) — better
Positive reviews52.8% of reviews—
Number of ratings3.5K — better1
Update frequencyEvery 2 weeksEvery 3 days — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPod, Apple Watch — betteriPhone, Apple Watch
Requires iOS15.0 — better17.0
Further details — not scored
Size219 MB4 MB
Age rating4+4+
DeveloperForm AthleticaDavid Fields

Customer experience

FORM Swim

All ratings3,500 ratings
Positive94.1%
Neutral2.2%
Negative3.7%
Written reviews178 reviews
Positive52.8%
Neutral12.9%
Negative34.3%

RunWindow

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

Bugs and requests

FORM Swim

Reported bugs

3 issues
  • Timer and distance tracking inconsistencies
  • App crashes and freezes
  • Unreliable heart rate monitoring

Requested features

5 requests
  • Ability to create custom workouts
  • Integration with other fitness platforms (e.g. Garmin, Apple Health)
  • Open water swim distance tracking without GPS
  • Current lap time display during swim
  • Export data for long-term analysis

RunWindow

Not enough reviews yet to summarise bugs or requests.

In-app purchases

3 purchases

FORM Swim

Subscriptions3
  • FORM Membership1 Month trial2 variants$14.991 Month
  • FORM Membership1 Month trial2 variants$119.001 Year
  • FORM Premium Annual1 Month trial$119.001 Year
None

RunWindow

No in-app purchases

Questions

Is FORM Swim free?
FORM Swim is free to download, with in-app purchases available.
Is RunWindow free?
RunWindow is free to download, with no in-app purchases.
Which has better reviews, FORM Swim or RunWindow?
RunWindow is rated higher. FORM Swim averages 4.7 out of 5 from 3.5K ratings, while RunWindow averages 5.0 from 1 ratings.
Do FORM Swim or RunWindow have ads?
Neither FORM Swim nor RunWindow shows ads.
Which is updated more often, FORM Swim or RunWindow?
FORM Swim ships an update every 2 weeks, and RunWindow every 3 days. Most recently, FORM Swim was updated on October 23, 2026 and RunWindow on October 24, 2026.

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