Millisecond stopwatch & timer vs CHALLNA
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Millisecond stopwatch & timer
This utility app offers both a stopwatch and a timer with millisecond precision. It includes smart presets, lap tracking, and customizable alerts. Ideal for precise timing in sports, studies, or experiments.
- Stopwatch and timer functionality
- Millisecond visualization
- Smart timer presets
- Lap/split tracking
- Dark mode
- Vibration/sound alerts
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[Key Features] - Dual features: Stopwatch + Timer - Millisecond visualization (00:00.00 format) - Smart timer presets (1min/5min/10min quick-set) - Lap/split tracking with comparative analysis - Dark mode & screen-always-on option - Vibration/sound alerts [Usecase] - Sports training & lap timing - Scientific experiments & lab use - Cooking/baking precision - Productivity time blocking
CHALLNA
This app helps you achieve precise timing for critical online events by displaying accurate server time, accounting for network latency. It offers one-touch presets for popular sites, countdown timers, and practice modes to improve your reaction speed for ticket sales, course registrations, and limited drops.
- Millisecond precision synchronization
- One-touch server presets
- Intuitive countdown timers
- Click practice mode
- Smart reminders and schedule registration
- Direct site access
- Dynamic Island support
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■ 0.01 Seconds Make All the Difference. Have you ever missed out on popular concert tickets, course registrations, or limited-edition drops by a split second? Don’t rely on your phone’s local time. Check the "Real Server Time" of the site itself. 'CHALLNA' will drastically increase your success rate. ■ Why CHALLNA? (Key Features) 1. Millisecond(ms) Precision Synchronization We do more than just fetch server time. CHALLNA calculates network latency (RTT) and average transmission deviations in real-time to correct any errors. Find the "true" 0.01 second with Korea’s highest level of precision. 2. One-Touch Server Presets Interpark, YES24, Melon Ticket, and even major university registration sites! No need to type addresses manually. Simply search to instantly register and track your desired server. 3. Intuitive Countdown & Target Setting Set your goal time and watch the countdown in real-time down to the millisecond. Stay perfectly prepared for that high-pressure moment right before the opening. 4. Click Practice for Real-World Reflexes Theory is different from practice! Use the built-in 'On-the-Dot Click Practice' to check your reaction speed and master the feeling of clicking at exactly 0.00 seconds. 5. Smart Reminders & Schedule Registration (HOT!) Register your important ticketing or course registration schedules. We’ll make sure you’re ready with custom notifications before your target time, even in your busy daily life. 6. Direct Site Access Why check the time and switch apps separately? CHALLNA provides direct outlinks to the sites, shortening your access time to the absolute minimum. 7. Dynamic Island Support Keep tracking the time via Dynamic Island even while moving to the ticketing site, ensuring you never miss the countdown. (Available on iPhone 14 Pro and later models) ■ Highly Recommended For: • Concert fans tired of losing out in "Blood-keting" (bloody ticketing). • Students desperate to secure popular university courses. • Anyone needing perfect timing for holiday train bookings or limited drops. • Perfectionists who won't settle for even a 0.01-second error. ■ Please Note: • Minor errors may occur depending on network conditions. We recommend using a stable Wi-Fi, 5G, or LTE environment. • For the best results, be sure to use the 'Click Practice' feature in advance! Download 'CHALLNA' now and experience the miracle of 0.01 seconds!
Screenshots
Verdict
The clearest difference is review sentiment: CHALLNA at 100% against Millisecond stopwatch & timer's 50%. CHALLNA also leads on ads (none vs shown) and update cadence (every 2 weeks vs every 4 months). On price, in-app purchases, device support and iOS requirement 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. Neither carries in-app purchases, so what you see is what you pay.
Millisecond stopwatch & timer ships an update every 4 months, CHALLNA every 2 weeks. The most recent releases landed on September 25, 2026 and August 24, 2026 respectively.
| Parameter | Millisecond stopwatch & timer | CHALLNA |
|---|---|---|
| Price | Free | Free |
| Rating | 4.0 (1 ratings) — better | — |
| Positive reviews | 50.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 1 — better | — |
| Update frequency | Every 4 months | Every 2 weeks — better |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Monetization | Ad-supported | Free — better |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 16.6 |
| Further details — not scored | ||
| Size | 38 MB | 38 MB |
| Age rating | 4+ | 4+ |
| Developer | Seulki Eom | RYNYUL |
Customer experience
Millisecond stopwatch & timer
CHALLNA
In-app purchases
Millisecond stopwatch & timer
No in-app purchases
CHALLNA
No in-app purchases





