Comparison

adhDO vs 99캘린더

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

Head to head
About

adhDO

Features
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adhDO helps you bring order to your day with a simple, linear timeline. No magic formulas, no motivational slogans – just an interface that doesn't guilt-trip you and lets you focus on what actually matters. Especially comfortable for people with ADHD, but designed to feel good for anyone tired of chaotic to-do lists. Timeline instead of endless lists All your tasks live in a single flow of time. Today's tasks sit at the top, tomorrow's below, then the days after. No separate boards or folders – you open the app and see exactly today and its real load, not a giant heap of everything in your life. An honest archive Yesterday and older days automatically move into the archive. Unfinished tasks don't drag behind you forever. If something really matters, pull it back to today in seconds. This lowers guilt and removes the illusion that you're "obliged" to do everything someday. Break down big tasks Any task can be split into tiny, concrete steps. Instead of a vague "I should deal with this someday," your brain sees a specific next step that takes two minutes – making it easier to start. Automatic day archiving Every day is like a separate page of your life. Today you work with it, tomorrow it gently moves into the archive. What's relevant stays in front of you. What's past remains accessible but doesn't press on you. Full sync iPhone, iPad, and Mac work together through iCloud. No extra registration, no third-party accounts – just secure, seamless sync. Deep iOS integration Add tasks with Siri, widgets for Home and Lock Screen, reminders and alarms, Shortcuts support, accessibility (VoiceOver, Dynamic Type), gesture controls and drag-and-drop between days. adhDO is available with a subscription or a one-time purchase. Try the app first, then decide. Prices vary by region and are shown before purchase. Subscription: Payment is charged to your Apple ID at purchase. Subscriptions renew automatically unless canceled at least 24 hours before the end of the current period. Renewal is charged within 24 hours before the current period ends. Manage or cancel anytime in App Store account settings. Cancellation stops future renewals but does not refund the current period. One-time purchase: Pay once, no automatic renewal. By using the app, you agree to our Privacy Policy, Terms of Use, and Apple's EULA. Privacy Policy: https://www.demidov.kz/adhdo/privacy.html Terms of Use: https://www.demidov.kz/adhdo/terms.html Apple EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

99캘린더

Features
Read full description

99Calendar is a schedule management app that brings together your timetable, daily timeline, and calendar in one place. Organize repeating weekly schedules in a timetable view, follow your day in a timeline view, and check date-based plans in the calendar. You can turn schedule sets on or off to focus only on what you need, and view timetable items together with calendar events. Features Weekly timetable-based schedule management Daily timeline view Turn schedule sets on or off View timetable items and calendar events together Import and export support Theme options Counter features for routine tracking 99Calendar is designed to help you manage everyday schedules in a simple and lightweight way. Some counter features are optional personal logging tools. Health or cycle-related information is for personal reference only and is not intended for medical diagnosis, treatment, or guidance.

Screenshots

adhDO4 screens
99캘린더4 screens

Verdict

The call

The clearest difference is price: adhDO at Free against 99캘린더's $1.99. 99캘린더's advantage is in-app purchases (none vs 3) and update cadence (every 4 days vs every 5 weeks). On ads, 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

adhDO is free to download; 99캘린더 costs $1.99 up front. adhDO sells 3 in-app purchases, starting at $1.99 per month. 99캘린더 asks for nothing beyond the download.

UpkeepUpdate frequency

adhDO ships an update every 5 weeks, 99캘린더 every 4 days. The most recent releases landed on October 1, 2026 and October 25, 2026 respectively.

Scorecard3 real differences · 3 level
adhDO versus 99캘린더: the parameters behind the verdict, then further details
ParameteradhDO99캘린더
PriceFree — better$1.99
Update frequencyEvery 5 weeksEvery 4 days — better
AdsNoNo
In-app purchasesYesNo — better
DevicesiPhone, iPad — betteriPhone
Requires iOS17.517.0 — better
Further details — not scored
Size7 MB5 MB
Age rating4+4+
DeveloperAlexey DemidovHWAN LEE

In-app purchases

3 purchases

adhDO

Subscriptions2
  • Monthly Subscription$1.991 Month
  • Annual Subscription$9.991 Year
One-time1
  • Lifetime Purchase$29.99
None

99캘린더

No in-app purchases

Questions

Is adhDO free?
adhDO is free to download, with in-app purchases available.
Is 99캘린더 free?
99캘린더 costs $1.99, with no in-app purchases.
Do adhDO or 99캘린더 have ads?
Neither adhDO nor 99캘린더 shows ads.
Which is updated more often, adhDO or 99캘린더?
adhDO ships an update every 5 weeks, and 99캘린더 every 4 days. Most recently, adhDO was updated on October 1, 2026 and 99캘린더 on October 25, 2026.

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