Comparison

FORM Swim vs hDrop App

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

hDrop App

This wearable sensor tracks fluid and sodium loss through sweat during exercise. It provides personalized hydration insights based on your unique physiology, helping endurance athletes optimize their performance. Analyze sweat loss, sodium intake, and rate trends to build a tailored hydration strategy.

Highlights
  • Wearable sweat sensor
  • Fluid and sodium loss tracking
  • Personalized hydration strategy
  • Sweat rate trend analysis
  • Workout data analysis
  • Comparison across conditions
Features
Read full description

hDrop is the first wearable sweat sensor designed to extract data from your sweat during exercise. Independently validated research shows that hDrop is the world’s most accurate wearable sweat sensor, helping athletes understand how much fluid and sodium they lose while training. Whether you are preparing for a marathon, triathlon, cycling event, or intense training session, hydration strategy matters. Generic hydration advice does not account for the fact that every athlete sweats differently. hDrop helps you personalize your hydration based on real physiological data. Measure What You Lose in Sweat hDrop continuously monitors your sweat during exercise and provides insights that help you understand your body's hydration demands. Track key metrics including: • Sweat Loss – Estimate how much fluid you lose during training • Sweat Sodium Loss – Understand electrolyte loss to guide sodium intake • Sweat Rate Trends – Learn how your hydration needs change with intensity and environment Build Your Personal Hydration Strategy Use your sweat data to create a hydration plan tailored to your physiology. With the hDrop app you can: • Analyze sweat loss across workouts • Understand sodium losses during exercise • Compare sessions in different weather conditions • Improve hydration planning for races and long training sessions Designed for Endurance Athletes hDrop is built for athletes who depend on hydration precision: • Triathlon • Marathon and running • Cycling • Trail and ultra endurance sports • Heat training and high-intensity workouts Scientifically Validated Technology hDrop technology has been independently validated by university research, demonstrating high accuracy in estimating sweat loss and sodium loss during exercise. The system was developed with a focus on translating laboratory sweat testing into a wearable field solution for athletes. Unlock Advanced Features with hDrop Lab The optional hDrop Lab membership provides deeper analysis tools, advanced hydration insights, and personalized hydration guidance based on your sweat profile. Hydrate smarter. Perform better. DISCLAIMER: hDrop is not intended to diagnose any health condition. hDrop is not a medical device. Please do not take any critical decisions based on hDrop's current data. Optional Add-On Terms: hDrop Lab is available as an optional add-on auto-renewable subscription. Payment will be charged to your Apple ID account at confirmation of purchase. The optional subscription automatically renews unless canceled at least 24 hours before the end of the current period. You can manage and cancel your subscription in your App Store account settings. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://hdroptech.com/privacy-policy

Screenshots

FORM Swim4 screens
hDrop App4 screens

Verdict

The call

The clearest difference is rating: FORM Swim at 4.7 against hDrop App's 3.9. FORM Swim also leads on ratings volume (3.5K vs 13). hDrop App's advantage is monetization model (free vs free with in-app purchases). On price, review sentiment, update cadence and ads 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 and hDrop App sells 2 in-app purchases, starting at $12.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

FORM Swim holds the better App Store score, 4.7 against 3.9. That said, the two scores are not equally well evidenced: FORM Swim has 3.5K ratings behind it against 13, so its average is the more settled of the two. Written reviews point the same way: 52% of FORM Swim's written reviews are positive against 47% of hDrop App's.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 2 weeks. The most recent releases landed on November 11, 2026 and November 7, 2026 respectively.

Scorecard3 real differences · 7 level
FORM Swim versus hDrop App: the parameters behind the verdict, then further details
ParameterFORM SwimhDrop App
PriceFreeFree
Rating4.7 (3.5K ratings) — better3.9 (13 ratings)
Positive reviews51.9% of reviews — better47.1% of reviews
Number of ratings3.5K — better13
Update frequencyEvery 2 weeksEvery 2 weeks
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPod, Apple Watch — betteriPhone, iPod
Requires iOS15.0 — better15.6
Further details — not scored
Size220 MB60 MB
Age rating4+4+
DeveloperForm AthleticahDrop Technologies Inc.

Customer experience

FORM Swim

All ratings3,523 ratings
Positive94.1%
Neutral2.2%
Negative3.7%
Written reviews183 reviews
Positive51.9%
Neutral13.1%
Negative35.0%

hDrop App

All ratings13 ratings
Positive69.2%
Neutral0.0%
Negative30.8%
Written reviews17 reviews
Positive47.1%
Neutral0.0%
Negative52.9%

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

hDrop App

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
2 purchases

hDrop App

Subscriptions2
  • hDrop Lab7 Days trial$12.991 Month
  • hDrop Lab7 Days trial$89.991 Year

Questions

Is FORM Swim free?
FORM Swim is free to download, with in-app purchases available.
Is hDrop App free?
hDrop App is free to download, with in-app purchases available.
Which has better reviews, FORM Swim or hDrop App?
FORM Swim is rated higher. FORM Swim averages 4.7 out of 5 from 3.5K ratings, while hDrop App averages 3.9 from 13 ratings.
Do FORM Swim or hDrop App have ads?
Neither FORM Swim nor hDrop App shows ads.
Which is updated more often, FORM Swim or hDrop App?
FORM Swim ships an update every 2 weeks, and hDrop App every 2 weeks. Most recently, FORM Swim was updated on November 11, 2026 and hDrop App on November 7, 2026.

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