Micro Clock vs Underwater Stopwatch
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Micro Clock
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Micro Clock keeps time visible while you use other apps. Start a Picture in Picture clock, countdown, or stopwatch, then return to the Home Screen, a presentation, a browser, or your work app without losing sight of the timer. CORE FEATURES • Floating clock with seconds • System 12-hour or 24-hour format • Countdown with accurate background recovery • Stopwatch with tenths of a second • Quick launch with Siri and Shortcuts • Timer data stored locally by default ADVANCED TOOLS • Presenter Mode with green, yellow, and red time stages • Focus Mode with automatic 25/5 and 50/10 cycles • Event Countdowns with saved time zones and links • Event reminders 5, 10, or 30 minutes in advance • Floating Picture in Picture display for every advanced mode PRIVACY BY DEFAULT No advertising or analytics SDKs. Core timer data and feature usage stay on your device. Core timer features require no account. Picture in Picture and notification behavior may depend on iOS settings and system conditions. Micro Clock is not intended for safety-critical timing.
Underwater Stopwatch
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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.
Screenshots
Verdict
The clearest difference is in-app purchases: Underwater Stopwatch at none against Micro Clock's 1. Underwater Stopwatch also leads on update cadence (every 3 days vs every 9 days). Micro Clock's advantage is iOS requirement (15.0 vs 18.0). 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
Both are free to download. Micro Clock sells 1 one-off in-app purchase. Underwater Stopwatch asks for nothing beyond the download.
Micro Clock ships an update every 9 days, Underwater Stopwatch every 3 days. Both last shipped on October 8, 2026.
| Parameter | Micro Clock | Underwater Stopwatch |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 9 days | Every 3 days — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Devices | iPhone, iPod | iPhone, Apple Watch |
| Requires iOS | 15.0 — better | 18.0 |
| Further details — not scored | ||
| Size | 6 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | 俊贤 黄 | Vlad Topala |
In-app purchases
Micro Clock
- Micro Clock Pro Lifetime$9.99
Underwater Stopwatch
No in-app purchases
Questions
Is Micro Clock free?
Is Underwater Stopwatch free?
Do Micro Clock or Underwater Stopwatch have ads?
Which is updated more often, Micro Clock or Underwater Stopwatch?
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