Comparison

Underwater Stopwatch vs Timerly

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

Head to head
About

Underwater Stopwatch

Features
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A lightweight Apple Watch stopwatch and timer built for wet hands. Everything is controlled by rotating the Digital Crown, so you never need the touchscreen. It keeps working when your fingers are wet, gloved, or underwater, and while your watch is in Water Lock. TWO MODES Stopwatch counts up from zero, with laps. Timer counts down from any duration you set, drawn as a draining hourglass, with three unmistakable buzzes at zero. Run past zero and the overtime is recorded too. CROWN CONTROLS Rotate up to start, pause, and save. Rotate down to add a lap, or to continue a paused session. No taps, no buttons, nothing to fumble for. HAPTIC TIME CUES Set a repeating buzz at any interval, plus an optional stronger one for milestones. A light tap every 30 seconds and a firmer one every 5 minutes, for example. Track elapsed time without ever looking at your wrist. STAYS ON SCREEN The app holds the display for your whole session, so a glance shows your timer instead of the watch face. ON YOUR IPHONE Every session syncs across: full history, lap splits with faster and slower comparisons, and your average and longest times. Set durations and cues from either device. BUILT FOR Swimming and pool laps. Surfing. Cold plunges and sauna rounds. Breath-hold and apnea training. Anything you time where looking at a screen is not practical. PRIVATE BY DEFAULT No workouts. No fitness tracking. No Health data. No account, no subscription, no ads, no analytics. Every session stays on your devices.

About

Timerly

Features
Read full description

TimeFlow is a clean, focused timer app for everyday timing—timer, stopwatch, and countdown in one place. Whether you’re deep in a Pomodoro session, timing a workout, cooking, studying, or counting down to an event, TimeFlow keeps time simple and reliable. TIMER Set precise countdowns for focus sessions, study blocks, workouts, and breaks. Name your session, start with one tap, and get notified when time’s up—even if the app is in the background or your phone is locked. STOPWATCH Track elapsed time with lap splits. Perfect for runs, intervals, drills, and anything you need to measure as it happens. COUNTDOWN Create countdown events for flights, deadlines, birthdays, launches, or any date and time that matters. See what’s coming next and get an alert when the moment arrives. PRESETS Save your favorite durations and reuse them instantly. Start with built-in presets like Pomodoro, Short Break, Deep Work, Study Session, and workout timers—or create your own for work, fitness, study, and personal routines. HISTORY & RECENT Finished sessions appear in History and on your Home Recent list, so you can quickly replay what you used last. Stay consistent without re-entering times. ALERTS & SOUNDS Choose how TimeFlow sounds when a timer ends—Chime, Bell, Alert, Radar, or silent. Pair alerts with vibration for clear feedback you won’t miss. DESIGNED TO STAY OUT OF THE WAY • Fast, portrait-first interface • Minimal controls you can use at a glance • Dark, focused look built for timing—not distraction • Works for focus, productivity, workouts, cooking, meditation, and daily life WHO IT’S FOR Students, creators, athletes, remote workers, and anyone who needs a reliable timer, stopwatch, or countdown without clutter. Download TimeFlow and make every minute count.

Screenshots

Underwater Stopwatch4 screens
Timerly4 screens

Verdict

The call

The clearest difference is iOS requirement: Timerly at 13.0 against Underwater Stopwatch's 18.0. On price, update cadence, ads and in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Underwater Stopwatch ships an update every 3 days, Timerly every 4 days. The most recent releases landed on October 25, 2026 and October 7, 2026 respectively.

Scorecard1 real difference · 5 level
Underwater Stopwatch versus Timerly: the parameters behind the verdict, then further details
ParameterUnderwater StopwatchTimerly
PriceFreeFree
Update frequencyEvery 3 days — betterEvery 4 days
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, Apple WatchiPhone, iPad, iPod — better
Requires iOS18.013.0 — better
Further details — not scored
Size4 MB27 MB
Age rating4+4+
DeveloperVlad TopalaKubra Nur AKIN

In-app purchases

None

Underwater Stopwatch

No in-app purchases

None

Timerly

No in-app purchases

Questions

Is Underwater Stopwatch free?
Underwater Stopwatch is free to download, with no in-app purchases.
Is Timerly free?
Timerly is free to download, with no in-app purchases.
Do Underwater Stopwatch or Timerly have ads?
Neither Underwater Stopwatch nor Timerly shows ads.
Which is updated more often, Underwater Stopwatch or Timerly?
Underwater Stopwatch ships an update every 3 days, and Timerly every 4 days. Most recently, Underwater Stopwatch was updated on October 25, 2026 and Timerly on October 7, 2026.

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