Sponge
Automatic sip tracking
On-device sensors log every sip the moment you drink, no buttons, no manual logging, no guessing how much water you’ve had.
Trusted by 120+ early customers
The smart hydration tracker for any water bottle
Sponge is a clip-on hydration tracking device that automatically tracks your water intake, every sip, from the bottle you already own. Clip it on, drink, and let the app keep you on track to your daily goal.
Works with any bottle8-day batteryFree iOS & Android app
Tracking sips
1.4Ltoday · 78% of goal
120+
Happy customers
30-day
Money-back guarantee
8 days
Battery life
Any
Water bottle
Meet Sponge
One tracker. Every sip, counted.
Sponge clips onto the bottle you already carry and quietly logs your hydration all day long.
The problem
Most people are dehydrated, and don’t even know it
Reminders get ignored. Manual water-tracking apps get abandoned in a week. And smart bottles force you to ditch the bottle you love. Hydration shouldn’t take willpower, it should just happen. That’s exactly what Sponge does.
How it works
Clip, sip, repeat
A genuinely passive hydration tracker. Three steps, then it disappears into your day.
1
Clip it on
Clip Sponge magnetically onto any water bottle in seconds. No new bottle, no setup ritual.
2
Sip like normal
Drink the way you already do. Sponge’s sensors automatically record every sip, zero logging.
3
Hit your goal
The app tracks your intake in real time, nudges you when you fall behind, and celebrates your streaks.
Features
Everything a hydration tracking device should be
Effortless to use, impossible to forget, and built around the bottle you already carry.
Clips to any bottle
A magnetic clip snaps onto the bottle you already own, from insulated steel to glass tumblers. No proprietary bottle to replace.
8-day battery
Go a full week-plus between charges, then top up in a couple of hours over USB-C. Charge it Sunday, forget about it.
Free iOS & Android app
Your hydration syncs automatically to a clean dashboard with daily goals, streaks, and trends you can actually act on.
App-lock motivation
Choose the apps that distract you and Sponge keeps them locked until you hit your water goal. Hydration with real follow-through.
Personalized goals
Goals adapt to your body, activity, and climate, so your target reflects what you actually need, not a generic 8 glasses.
The hydration hack for your phone
Turn your phone into a reason to drink water
Sponge’s app can lock the apps that distract you most until you reach your daily hydration goal. It’s the accountability a normal water tracker can’t give you, and it actually works.
- ✓ Pick which apps to gate behind your water goal
- ✓ Real-time progress unlocks them as you drink
- ✓ Build a lasting hydration habit, not a one-week streak
Who it’s for
Built for anyone who keeps forgetting to drink water
One simple hydration tracker, a lot of people it quietly helps every day.
Athletes & active people
Dial in hydration around training and recovery with accurate, automatic intake data you can trust.
Busy professionals
Back-to-back days make it easy to forget to drink. Sponge tracks for you and nudges before you fall behind.
Caregivers & families
Keep an eye on a loved one’s hydration with effortless tracking and shared progress. See our caregiver program →
Reviews
What early customers are saying
Real, unedited feedback from the first Sponge owners.
“Beautiful.”
Verified customerFocus and energy · Gift for someone
“Still testing it out but the app works well. It would be nice to see a how-to video explaining any nuances, including whether it keeps tracking water intake when the app is closed. It would be cool if it integrated with Whoop or Apple Health.”
Verified customerDaily habit building · Fitness and training
“I really like the clip from a hardware perspective. The main thing I’d love is a connection from the app to Apple Health, and, if possible, not having to open the app to sync data from the clip.”
Verified customerFitness and training · Preventive health
“Needs to be thinner, like 10mm total.”
Verified customerPreventive health
Stop guessing. Start tracking.
Join 120+ people building a real hydration habit with the clip-on tracker that works with any bottle.
The hydration tracker that fits your life
Sponge is a smart hydration tracker and clip-on hydration tracking device designed to make drinking enough water effortless. Instead of relying on reminders you ignore or a manual water intake tracker app you abandon, Sponge measures every sip automatically and syncs it to your phone. It’s the hands-free water tracking device that finally turns hydration into a habit.
Works with the water bottle you already own
Unlike a smart water bottle that forces you to replace your favorite tumbler, Sponge’s magnetic clip attaches to virtually any bottle, insulated steel, plastic, or glass. That makes it one of the most flexible automatic hydration trackers you can buy: keep your bottle, add the tracking.
A daily water tracker that motivates you
The free Sponge app is more than a daily water tracker. With personalized goals and an optional app-lock feature, it gives you real accountability. Whether you’re an athlete fine-tuning recovery, a busy professional who forgets to drink, or a caregiver monitoring a loved one, Sponge is the sip tracker and drink-water reminder device that actually changes behavior.