Comparison

땡초 vs Atto

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

Head to head
About

땡초

Features
Read full description

땡초는 티켓팅, 수강신청, 예약 오픈, 선착순 이벤트처럼 1초가 중요한 순간을 위한 서버 시간 확인 앱입니다. 원하는 사이트의 서버 응답 시간을 기준으로 현재 시각을 확인하고, 목표 시각까지 남은 시간을 카운트다운으로 볼 수 있습니다. Dynamic Island와 Live Activity로 앱 밖에서도 남은 시간을 확인할 수 있고, 목표 시각 알림과 햅틱으로 중요한 순간을 놓치지 않도록 도와줍니다. 주요 기능 - URL 기반 서버 시간 확인 - 목표 시각까지 카운트다운 - Dynamic Island 및 Live Activity 지원 - 목표 시각 알림 및 햅틱 - 인기 사이트 추천 목록 - 티켓팅 감각을 연습할 수 있는 시뮬레이션 - 다른 사용자의 연습 랭킹 확인 이럴 때 사용해 보세요 - 콘서트, 공연, 팬미팅 티켓팅 전 - 수강신청 시작 전 - 예약, 오픈런, 선착순 신청 전 - 정각에 맞춰 직접 버튼을 눌러야 할 때 - 티켓팅 타이밍을 미리 연습하고 싶을 때 땡초는 자동 예매, 자동 클릭, 자동 새로고침 기능을 제공하지 않습니다. 사용자가 직접 시간을 확인하고 준비할 수 있도록 돕는 시간 보조 도구입니다.

About

Atto

This utility app precisely measures and displays server clock times for time-sensitive events like ticket drops. It offers advanced features to correct for device drift and ensure accurate countdowns, even while using other applications.

Highlights
  • Server clock synchronization
  • Millisecond precision countdown
  • Device drift correction
  • Picture-in-Picture mode
  • Haptic and sound alerts
  • Practice mode for timing
  • Supports over 300 time sources
Features
Read full description

A ticket drop is decided in milliseconds, not seconds. The queue opens on the booking server's clock, not your phone's. The two are usually tens to hundreds of milliseconds apart, and that gap decides your place in line. Atto reads the server's clock directly, and shows you how well it read it. Measuring server time An HTTP Date header only resolves to the second, so one read tells you ±500ms and no more. Atto probes at 137ms intervals so each request lands on a different phase inside the second. Once the offset narrows, it predicts when the server's second will roll over and aims at that edge. Twenty overlapping measurements fold the error down to the round trip. The error bar stays visible Instead of a label like "high accuracy" you get the measured figure: ±23ms. Sample count, rejected samples, best round trip, and how far this server runs from national standard time are all on screen. Cached responses get dropped When a CDN answers instead of the origin, the clock inside that response is frozen at the moment it was stored. Atto checks the Age and cache headers and keeps those responses out of the average. Device drift correction Your phone's oscillator runs seconds off per day. Atto measures the slope between syncs, extrapolates it to now, and re-syncs every two minutes while you wait. Picture in Picture Press Start and a Picture in Picture window floats above your other apps. Show a decreasing countdown or a corrected wall clock that advances toward your configured target, with three-digit milliseconds. Keep the timing in sight while using a booking app or webpage. Haptics and sound Taps begin at the lead time you set and end with one hard hit at zero. The whole pattern goes to Core Haptics up front rather than a timer, so zero does not move even if the screen stutters. Sound is optional and plays through the silent switch. Practice mode A recommended lead time is somebody else's number. Measure the gap between the buzz and your tap actually registering, then apply your own median. Time sources Over 300 sources across 14 regions, including Ticketmaster, AXS, StubHub, Interpark, e+, tixCraft and Damai, plus course registration sites and sneaker drops. Standard-time servers like NIST, NPL, PTB, NICT and KRISS are there too, and you can type any address yourself. Free and paid Everything that decides whether you get the ticket is free: full sync accuracy, drift correction, the on-screen countdown, haptics, every time source, practice mode. One rewarded ad floats a single countdown in a PiP window. A one-time purchase removes ads and keeps PiP unlocked. It is not a subscription. Reading a clock takes one HEAD request. Atto never asks for an account and takes no part in the booking itself. English, 한국어, 日本語

Screenshots

땡초4 screens
Atto4 screens

Verdict

The call

The clearest difference is in-app purchases: 땡초 at none against Atto's 1. 땡초 also leads on ads (none vs shown). Atto's advantage is update cadence (every 4 days vs every 2 months). On price, 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Atto sells 1 one-off in-app purchase. 땡초 asks for nothing beyond the download.

UpkeepUpdate frequency

땡초 ships an update every 2 months, Atto every 4 days. The most recent releases landed on October 25, 2026 and October 29, 2026 respectively.

Scorecard3 real differences · 5 level
땡초 versus Atto: the parameters behind the verdict, then further details
Parameter땡초Atto
PriceFreeFree
Positive reviews—100.0% of reviews
Update frequencyEvery 2 monthsEvery 4 days — better
AdsNo — betterYes
In-app purchasesNo — betterYes
Monetization—Free with in-app purchases
DevicesiPhone, iPad — betteriPhone
Requires iOS17.617.0 — better
Further details — not scored
Size2 MB11 MB
Age rating4+4+
DeveloperGeonWoo ShinBeomjin In

In-app purchases

None

땡초

No in-app purchases

1 purchases

Atto

One-time1
  • Atto Pro$1.99

Questions

Is 땡초 free?
땡초 is free to download, with no in-app purchases.
Is Atto free?
Atto is free to download, with in-app purchases available.
Do 땡초 or Atto have ads?
Atto shows ads; 땡초 does not.
Which is updated more often, 땡초 or Atto?
땡초 ships an update every 2 months, and Atto every 4 days. Most recently, 땡초 was updated on October 25, 2026 and Atto on October 29, 2026.

Other comparisons