Second-Sync Downloads & RevenueSecond-Sync · App Store & Google Play
Second-Sync gets 100+ downloads a day worldwide (AppInsider estimate, November 2026, rounded down to a band).
Second-Sync by Minjun Kim is on App Store and Google Play. Active Users (MAU & DAU), Downloads, rankings, keywords, revenue, and rating totals.
Full timeline · 36 events
- 📦Second-Sync updated to version 2.0.7iOSThe practice result screen now shows a recommended adjustment value
The practice result screen is now available in multiple languages - ✏️Second-Sync: new screenshotsAndroid12 screenshots (was 4) · US
- 📦Second-Sync updated to version 2.0.6iOS위버스 폼 주소로 동기화가 안 되던 문제 수정
- 📦Second-Sync updated to version 2.0.5iOSImproved prevention of delays in PiP timer sound and vibration effects
The contact email address for inquiries has changed - ✏️Second-Sync: new iPad screenshotsiOS· KR
- ✏️Second-Sync: new screenshotsiOS4 screenshots (was 4) · KR
- 📦Second-Sync updated to version 2.0.4iOS1. Practice without a security code
- Turn off "Use security code" in practice settings to skip the security code step and go straight to the next step.
2. Better site sync
- Fixed an issue where some sites, like Naver Shopping, Naver Form, wouldn't sync or took a long time to sync.
3. Foldable phone support
- Unfold the iPhone Duo to see the clock on the left and the site list on the right.… more - 📦Second-Sync updated to version 2.0.3iOS1. More accurate speed test
- Line speed is now calculated after your connection has fully ramped up, so results stay close to your real speed even on fast connections.
2. Clearer ping info
- The screen now shows that ping is measured to the server of the site you picked, so you can see why the number differs from other speed test apps.… more - 📦Second-Sync updated to version 2.0.2iOS1. 속도 측정 간소화
- 꼭 필요한 항목만 남겨 측정이 더 빨리 끝납니다.
2. 연습모드 개선
- 버튼 자동활성화 방식에서 실제 사이트와 다른 로딩 표시를 없앴습니다. - ✏️Second-Sync: new iPad screenshotsiOS· KR
- ✏️Second-Sync: new screenshotsiOS4 screenshots (was 4) · KR
- ✏️Second-Sync added 2 languagesiOS+ ID + TH
- ✏️Second-Sync: app got biggeriOS58 MB → 72 MB (+25%)
- 📦Second-Sync updated to version 2.0.1iOSWe've reorganized the site list by country.
1. Sites by country
- Pick a country at the top to see the sites people there use most, grouped by category like ticketing, course registration, shopping and travel.
2. Search by address
- You can now search using the site addresses people commonly know.
3. b.stage pre-recording added
- Get ready for music show pre-recording sign-ups right on server time.
4. Practice mode improvements
- Tapping quickly no longer zooms the screen in or out.… more - ✏️Second-Sync: new screenshotsAndroid4 screenshots (was 4) · US
- ✏️Second-Sync: new screenshotsAndroid4 screenshots (was 4) · US
- 📈Second-Sync entered the top 100AndroidTop Free · Tools · KR
- 📈Second-Sync entered the top 100iOSTop Free · All Apps · KR
- ✏️Second-Sync: new iPad screenshotsiOS· KR
- ✏️Second-Sync: new screenshotsiOS4 screenshots (was 4) · KR
- ✏️Second-Sync: languages changediOS
- 📦Second-Sync updated to version 1.5.8iOS- Added a full-screen clock
- Added Daum Cafe and TIGET sites
- Added Traditional Chinese - 📦Second-Sync: now updating weeklyiOS4 updates in 30 days, after a quiet two months
- 🆕Second-Sync: its developer released another app: TokenMaxxeriOS
- 📦Second-Sync updated to version 1.5.7iOS• Practice mode improvements
• Updated the NOL sync target address - 🆕Second-Sync: its developer released another app: AdRadar - 애드몹 수익 모니터iOS
- ✏️Second-Sync: app got biggeriOS52 MB → 58 MB (+12%)
- 📦Second-Sync updated to version 1.5.6iOS• New illustrated how-to guide
• Improved schedule screens
• Popup button moved right under the clock
• Naver Form added to ticketing sites
• Stability improvements - 🆕Second-Sync first spotted by AppInsiderAndroidSouth Korea
- 📈Second-Sync entered the top 10iOSTop Free · Utilities · KR
- 📈Second-Sync charting in a new countryiOSJapan
- 📈Second-Sync entered the top 100iOSTop Grossing · Utilities · KR
- 🆕Second-Sync first spotted by AppInsideriOS#43 in Top Free · Utilities · South Korea
- 📦Second-Sync version 1.5.5iOSNo release notes
- 🆕Second-Sync released on Google PlayAndroid
- 🆕Second-Sync released on the App StoreiOS
Collected from the stores by AppInsider since we first spotted the app. Dates are when we saw each change.
Utilities FreeSecond-Sync at a glance
AI summary written from our chart and store data, 2026-10-16. It can be wrong: check the numbers above.
Second-Sync is a free utility that provides millisecond-accurate server time synchronization for users needing precise timing during high-stakes events like university course enrollment and ticket booking. The app currently ranks #2 in the Korean Utilities Free category and #40 in All Apps Free, indicating strong traction among local users seeking specialized timing tools.
Similar apps: Atomic Clock Sync, World Clock, Timer+ Stopwatch
App Store
App details
App privacy Measured
Second-Sync’s App Store privacy label declares 0 data categories used to track you across other companies’ apps and websites, 6 linked to your identity and 1 collected anonymously.
As declared by the developer on the App Store — Apple requires every app to publish this label. We track changes over time.
Google Play
App details
Second-Sync downloads & installs
Both stores, worldwide. Bands are open; exact numbers are free with an account.
| Store | Downloads / day | Lifetime installs |
|---|---|---|
| App Store | 100+ | 50k+ |
| Google Play | 100+ | 10k+ Measured |
| Total | 100+ Confidence | 50k+ Confidence |
How this is calculated
Where Second-Sync's downloads come from Modelled
Last 30 days: organic search, browsing the store, features and paid ads.
Active users
All platforms, worldwide. Free with an account.
Retention · share of new users still active
Time spent · per daily user
How this is calculated
In-app revenue
Worldwide, what users spend before Apple and Google take their fee.
| Store | Per day | Per month | Share |
|---|---|---|---|
| App Store | |||
| Google Play | |||
| Total | Confidence | 100% |
Business model: Subscription-led
How Second-Sync makes money: subscriptions, one-off purchases and ads.
Top in-app purchases · App Store US, most popular first
| 1 | 초정확 Pro 업그레이드 subscription |
Where it ranks now
Both stores, across every country we track.
| Store | Best rank | Charting in | US Top Free | US Top Grossing |
|---|---|---|---|---|
| App Store | #47 Utilities Free | 1 of 30 countries | – | – |
| Google Play | #89 Tools Grossing | 1 of 23 countries | – | – |
Full chart lists: App Store · Google Play.
Review momentum
ⓘ How we measure thisReview momentum (0-100) blends how fast the app collects ratings compared with other apps in its category (60%), whether that pace is speeding up (25%) and what recent raters give it (15%; recent stars well below lifetime pull it down). Ratings counts are read daily. A jump usually means a launch, a feature, ads or a new review prompt.
Ratings
Both stores. Store data, measured.
| Store | Rating | Ratings |
|---|---|---|
| App Store | 4.8 ★ | 713 |
| Google Play | 4.5 ★ | – |
| Both stores | 4.8 ★ weighted by ratings | 713 |
What users say about Second-Sync
From recent reviews.
About Second-Sync
Second-Sync is a time synchronisation tool for moments where one second matters, such as course enrolment and ticketing. It multi-samples the HTTP Date of your chosen site and aligns the difference from the server clock down to milliseconds. Drift tracking maintains accuracy over time, while the PiP timer lets you watch live server time even when using other apps.
Key features
- Precise synchronisation: collects HTTP Date in parallel at least 30 times, then calculates the offset after RTT compensation, outlier removal and EMA smoothing.
- Drift estimation: runs linear regression on measured samples to track the slope of the device clock and maintain accuracy as time passes.
- PiP timer: opens a Picture in Picture timer as a companion app, so you can monitor the server clock live while using a browser or other apps.
- Example site shortcuts: quick buttons to load course enrolment pages for major Korean universities and ticket booking sites.
- Multilingual support: supports Korean, English, Japanese and Simplified Chinese, with a separate in-app language setting.
Recommended for
- Anyone who wants exact server time in situations where it is critical, such as enrolment, ticketing or reservations.
- Anyone who wants to keep accurate server time visible on iPhone or iPad while booking on the go.
Notes
- Synchronisation may fail on sites that do not support the HTTP Date header. If so, enter another target server or use the example sites in the app.
- Picture in Picture works only on supported devices running iOS 15 or later, including iPadOS.
- Sync your server time with Second-Sync now. One button gives you stable synchronisation and a PiP timer, so you do not miss the important moment!
Second-Sync App Store
Second-Sync gets 100+ downloads a day worldwide (AppInsider estimate, November 2026, rounded down to a band).
Second-Sync is #47 in Utilities Free in South Korea and charting in 1 of 30 countries we track.
Updated 8 Nov 2026 · rankings refresh through the day
24 Sep 2026 Utilities FreeSecond-Sync at a glance
AI summary written from our chart and store data, 2026-10-16. It can be wrong: check the numbers above.
Second-Sync is a free utility that provides millisecond-accurate server time synchronization for users needing precise timing during high-stakes events like university course enrollment and ticket booking. The app currently ranks #2 in the Korean Utilities Free category and #40 in All Apps Free, indicating strong traction among local users seeking specialized timing tools.
Similar apps: Atomic Clock Sync, World Clock, Timer+ Stopwatch
Second-Sync on the App Store
App details
App privacy Measured
Second-Sync’s App Store privacy label declares 0 data categories used to track you across other companies’ apps and websites, 6 linked to your identity and 1 collected anonymously.
As declared by the developer on the App Store — Apple requires every app to publish this label. We track changes over time.
Second-Sync downloads
Worldwide, per day, and installs to date. The band is open; the exact number is free with an account.
How this is calculated
Where Second-Sync's downloads come from Modelled
Last 30 days: organic search, browsing the store, features and paid ads.
Active users
All platforms, worldwide. Free with an account.
Retention · share of new users still active
Time spent · per daily user
How this is calculated
In-app revenue
Worldwide, what users spend in Second-Sync before Apple and Google take their fee.
How this is calculated
Business model: Subscription-led
How Second-Sync makes money: subscriptions, one-off purchases and ads.
Top in-app purchases · App Store US, most popular first
| 1 | 초정확 Pro 업그레이드 subscription |
Where it ranks now
Every top chart it appears in across 30 countries.
| Country | Charts | Rank |
|---|---|---|
| South Korea | UtilitiesFree | #47 |
Apps near Second-Sync on the chart
Utilities Free, around #47.
Ratings
App Store, worldwide.
Review momentum
ⓘ How we measure thisReview momentum (0-100) blends how fast the app collects ratings compared with other apps in its category (60%), whether that pace is speeding up (25%) and what recent raters give it (15%; recent stars well below lifetime pull it down). Ratings counts are read daily. A jump usually means a launch, a feature, ads or a new review prompt.
What users say about Second-Sync
From recent reviews.
About Second-Sync
Second-Sync is a time synchronisation tool for moments where one second matters, such as course enrolment and ticketing. It multi-samples the HTTP Date of your chosen site and aligns the difference from the server clock down to milliseconds. Drift tracking maintains accuracy over time, while the PiP timer lets you watch live server time even when using other apps.
Key features
- Precise synchronisation: collects HTTP Date in parallel at least 30 times, then calculates the offset after RTT compensation, outlier removal and EMA smoothing.
- Drift estimation: runs linear regression on measured samples to track the slope of the device clock and maintain accuracy as time passes.
- PiP timer: opens a Picture in Picture timer as a companion app, so you can monitor the server clock live while using a browser or other apps.
- Example site shortcuts: quick buttons to load course enrolment pages for major Korean universities and ticket booking sites.
- Multilingual support: supports Korean, English, Japanese and Simplified Chinese, with a separate in-app language setting.
Recommended for
- Anyone who wants exact server time in situations where it is critical, such as enrolment, ticketing or reservations.
- Anyone who wants to keep accurate server time visible on iPhone or iPad while booking on the go.
Notes
- Synchronisation may fail on sites that do not support the HTTP Date header. If so, enter another target server or use the example sites in the app.
- Picture in Picture works only on supported devices running iOS 15 or later, including iPadOS.
- Sync your server time with Second-Sync now. One button gives you stable synchronisation and a PiP timer, so you do not miss the important moment!
Latest updates
Store changes
What Second-Sync changed on its store page: name, icon, screenshots, price, size, languages, requirements.
More from Minjun Kim
Second-Sync Android
Second-Sync gets 100+ downloads a day worldwide (AppInsider estimate, November 2026, rounded down to a band).
Second-Sync is #89 in Tools Grossing on Google Play in South Korea and charting in 1 of 23 countries we track.
Updated 8 Nov 2026 · rankings refresh through the day
Tools GrossingSecond-Sync on Google Play
App details
Second-Sync downloads
Worldwide, per day, and installs to date. The band is open; the exact number is free with an account.
How this is calculated
Where Second-Sync's downloads come from Modelled
Last 30 days: organic search, browsing the store, features and paid ads.
Active users
All platforms, worldwide. Free with an account.
Retention · share of new users still active
Time spent · per daily user
How this is calculated
In-app revenue
Worldwide, what users spend in Second-Sync before Apple and Google take their fee.
How this is calculated
Business model: Subscription-led
How Second-Sync makes money: subscriptions, one-off purchases and ads.
Top in-app purchases · App Store US, most popular first
| 1 | 초정확 Pro 업그레이드 subscription |
Where it ranks on Google Play
Every top 200 chart it appears in across 23 countries.
| Country | Charts | Rank |
|---|---|---|
| South Korea | ToolsGrossing | #89 |
Apps near Second-Sync on the chart
Tools Grossing, around #89.
Ratings
Google Play, worldwide.
About Second-Sync
Ultra-accurate is a server time timer that measures the HTTP Date of the desired site multiple times and corrects the error with the server clock in milliseconds for moments where every second is important, such as course registration and ticketing. Drift tracking ensures accuracy over time, and PiP Timer lets you keep track of server times while using a browser or other apps.
Main features
- Precise synchronization: HTTP Date is collected multiple times, undergoes RTT correction, outlier removal, and EMA smoothing, then calculates the server time offset.
- Drift estimation: Tracks the drift of a device's clock based on measurement samples to correct for displayed time drift over time.
- PiP Server Time Timer: You can display the server time in the Picture in Picture window and check the time while viewing the course registration, ticketing, and reservation screens.
- Proven site presets: We provide presets that allow you to quickly select major domestic university course registration sites and ticketing/reservation sites.
- Improved site compatibility: By strengthening the HTTPS and Date header processing flow, more sites can reliably check the server time.
- Notification options: Screen notifications and sound notifications can be turned on and off respectively, allowing you to use them according to the situation.
- Multilingual support: Supports Korean, English, Japanese, and Simplified Chinese, and you can select the language within the app.
I recommend it to people like this
- Those who prepare for moments where server time is the standard, such as course registration, ticketing, and reservations.
- Those who want to view accurate server time and perform browser tasks simultaneously on their Android phone or tablet
- Those who always keep track of time using the PiP window and do not want to miss important moments
Precautions
- Synchronization may fail on sites that do not provide the HTTP Date header or have limited network response. In this case, please enter a different synchronization target server or use the app's preset.
- The Picture in Picture feature only works on supported devices such as Android 8.0 or higher.
- Sound notifications may be affected by your device's volume, silent mode, and notification settings.
Set the server time right now with extreme accuracy. Reliable synchronization, PiP timer, and notification options help you better prepare for important moments.
Store changes
What Second-Sync changed on its store page: name, icon, screenshots, price, size, languages, requirements.