Time trial
An all-out swim over a set distance (50·100·400m). It sets the starting point for where you are right now.
AI SWIM COACH
Swim alone —
Swim alone —
with a coach
on your wrist
One test swim (TT) is all it takes — PoolPace computes your CSS and zone paces, then prescribes your training every week. Apple Watch counts your laps and strokes, so you can focus on the water.
CSS & zone pace prescriptions·Personal heart-rate zones·Per-set stroke efficiency·Auto-tracking on the watch·Conversational AI coach
Get launch updates
Coming soon to the App Store
No spam — just one email on launch day.
Built by a developer who swims, for everyone who trains without a coach.
Swimming is 90% technique.
Yet most apps only count meters.
When you swim alone, you can't tell whether you're actually improving — whether your pace is dropping, or your stroke is getting more efficient. PoolPace doesn't coach how far you went. It coaches how you'll get faster — with CSS pace and per-set stroke efficiency (SPL).
One test swim becomes
twelve weeks of training
-
01
TT
Log a time trial
Just enter a 50, 100, or 400m time trial (TT). Sign up once — after that, the watch fills in your data automatically.
-
02
CSS 1:28
AI does the math
From your results, it computes your CSS (critical swim speed) and target pace for every zone. Not a guess — numbers derived from your actual splits.
-
03
8×50 @1:10
Get a weekly prescription
Sets are built around your goal, focus stroke, and gear — concrete enough to follow right away, like “Tuesday, 8×50m on a 1:10 cycle.”
-
04
AUTO
The watch tracks it
Apple Watch records distance, laps, and strokes automatically. When you're done, your efficiency and stats fill in — and the next prescription adapts.
Just ask your coach
This is not a generic chatbot. It reads your TT results, your recent sets, and how you feel today — and actually changes today's workout. Like this:
YOU
My shoulder feels a bit stiff today, but I still want to swim.
COACH
Then let's take it down a notch today. I'll slow your main 8×50m cycle from 1:05 → 1:10 and drop the paddles, since they load the shoulder most. We'll add more kick work instead. If the pain carries into tomorrow, a rest day is the right call.
Example conversation — prescriptions depend on your own results and condition.
This is what a week's
prescription looks like
Pick a goal — sprint, distance, drills, or balance — check your focus stroke and gear, and a full week of sets comes out. Not vague advice: distance, pace, and rest, all in numbers. You can always build your own workout, too.
TUE Sprint · Freestyle
Z4
Warm-up
300m free/back mix — easy, settle your breathing
Build
4×50m catch-up drill · cycle 1:20
Main
8×50m sprint · cycle 1:10 — target 0:44 (CSS pace)
Extra
4×25m kickboard kick · cycle 0:55
Cool-down
200m easy swim
Total1,200m · ~40 min
Example prescription — rate each workout ‘easy · right · hard’ and the intensity and volume adjust automatically.
APPLE WATCH
Even in the pool,
Even in the pool,
your coach stays on your wrist
No phone, no laminated training sheet. Today's sets show up on the watch, and distance, laps, and strokes are recorded automatically while you swim. Every time you push off the wall, your target pace goes with you.
- Check sets without your phone · automatic lap counting
- Distance, strokes, and pace sync automatically
- Built on HealthKit — your data stays yours
‘Swim in Zone 2’ —
finally in your own numbers
The same ‘Zone 2’ for a 20-year-old ex-competitor and a 50-year-old beginner is a label, not a plan. PoolPace estimates your max heart rate (HRmax) from age and sex, then applies a swim-specific −10 bpm correction — your heart rate runs lower in the water than on land. That's why we don't just copy running-app zones.
Z1Recovery88–106bpm
Z2Endurance106–123bpm
Z3Threshold123–141bpm
Z4VO₂ Max141–158bpm
Z5Sprint158–176bpm
Example · 32-year-old male. Add your resting heart rate and zones get more precise via heart-rate reserve (Karvonen) — and the AI uses these exact bpm numbers in your prescriptions.
Pricing, up front and honest
Logging, stats, and watch sync stay free. Choose Pro only when you want unlimited AI coaching.
Free
Swim logging · weekly stats · automatic Apple Watch tracking
₩0
PoolPace Pro
Unlimited AI coach chat · weekly personalized programs · workout analysis & feedback
₩9,900/mo
₩79,000/yr (≈₩6,583/mo · save 33%)
Every Pro plan includes a 14-day free trial · auto-renews · cancel anytime · billed to your Apple ID. Prices shown in KRW (Korean App Store); local pricing may vary.
New terms?
Thirty seconds is all you need
Coaches use these words, but they're simple once you see them. These are the metrics PoolPace uses to coach not ‘how far you went’ but ‘how you'll get faster’.
Critical swim speed
The pace you can hold for a long time without blowing up. Computed from your TT results, it is the anchor for every training zone. (Re-test every 6–8 weeks.)
Strokes per length
How many strokes you take per 25m length. Lower is more efficient — you glide farther on every pull.
Distance per stroke
How far you travel on each stroke (in meters). Higher is better — SPL's twin metric; as your efficiency improves, they move together.
Frequently asked questions
When does it launch?
We're preparing for App Store review. Leave your email via ‘Get launch updates’ and we'll email you exactly once — on launch day.
How much can I do for free?
Swim logging, weekly stats, and automatic Apple Watch tracking stay free. If you want unlimited AI coach chat and weekly program generation, choose Pro (14-day free trial).
Do I need an Apple Watch?
No. Log your swims manually and prescriptions and stats work exactly the same. A watch just fills in distance, laps, and strokes automatically.
What do I need to enter for personal heart-rate zones?
Age and sex are enough — your personal zones are computed right away. For more precision you can add your resting heart rate, but that's optional. Resting heart rate is sensitive health data, so we ask for separate consent before storing it, and you can delete it in one tap from My Page.
What happens to my data?
Health data is read only under HealthKit permissions. You can delete your account and all data instantly, anytime, from My Page → Delete account. Details are in our privacy policy.
FROM THE MAKER
I'm a developer who swims. Training alone without a coach, I found myself googling ‘what should I do today’ before every session — until I started building the coach I wanted to use. PoolPace is the tool I use every day, so I can't afford to build it carelessly.
— Junwon Bae, maker of PoolPace · [email protected]
Start next season
with data
You've done enough training that only counts meters. PoolPace is coming soon to the App Store.
One email on launch day. That's all.