Comparison

Calendars vs Smart Tasks AI Scheduler

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

Head to head
About

Calendars

This app combines a calendar, task manager, daily planner, and habit tracker. It helps users plan their day, build habits, boost productivity, and stay organized with seamless syncing across all Apple devices. Features include event creation, to-do list management, natural language input, and integration with popular meeting platforms.

Highlights
  • Calendar, task, and habit management
  • Daily, weekly, and monthly views
  • Natural language event creation
  • To-do list organization
  • Cross-device syncing
  • Meeting platform integration
Features
Read full description

Calendars by Readdle is the all-in-one calendar, task manager, daily planner, and habit tracker — seamlessly working across all your Apple devices: Mac, iPhone, iPad, and Apple Watch. Plan your day, build better habits, boost productivity, and stay organized with powerful features and smooth sync between all your devices. What you can do with Calendars: • View and manage your calendar with daily, weekly, and monthly views • Create events, set reminders, and never miss important dates • Use the built-in agenda planner to focus on what matters most • Organize your to-do list and manage your tasks with ease • Quickly add events or to-do items using natural language • Build routines and track your habits to stay consistent • Take a guided productivity course to improve time management and focus • Sync across devices with Google Calendar, iCloud, and more • Customize your planner calendar with color coding and widgets • Join Zoom, Google Meet, or GoToMeeting directly from your calendar • Stay in control of your time, wherever you are Whether you're planning a busy workday, building new habits, or working on personal growth, Calendars brings everything together to help you own your time — across all your Apple devices. Privacy Policy: https://readdle.com/calendars/legal/privacy Terms of Service: https://readdle.com/calendars/legal/terms Have questions, comments, or issues? Don’t hesitate to reach out to us at http://readdle.com/contact

About

Smart Tasks AI Scheduler

This AI-powered organizer simplifies planning and boosts productivity. It allows natural language task creation, automatically breaks them into subtasks, and intelligently schedules them into your calendar. Stay organized with smart weekly planning and custom reminders.

Highlights
  • AI-powered task management
  • Natural language task creation
  • Automatic subtask generation
  • Intelligent AI scheduling
  • Calendar synchronization
  • Customizable reminders
  • Habit tracking
Features
Read full description

Smart Tasks. AI Scheduler. Powerful AI Calendar. SubTask AI is your all-in-one smart task manager, AI scheduler, and calendar app — built to simplify planning, boost productivity, and organize your life with the power of AI. Create tasks in natural language, break them into smart subtasks, and let our AI scheduler find the perfect time. Stay ahead with a smart weekly planner that syncs with all your calendars. Key Features • Smart Task Manager – Just type “Submit report Friday” and SubTask sets the due date, priority, and reminders. • AI Scheduler – Let AI suggest the best time for each task based on your availability and workload. • AI Calendar & Weekly Planner – Switch between daily, weekly, and calendar views to see every task and event. • Smart Subtasks & Checklists – Turn big goals into manageable, trackable steps. • Calendar Sync – Google, Outlook, and Apple Calendar integration. • Custom Reminders – Set reminders by time, location, or recurrence. • Habit Tracker & Goals – Build habits and streaks with AI-based insights. • Offline & Private – Offline-first with end-to-end encrypted sync. Ideal for: Busy professionals • Students • Freelancers • Remote teams • Parents Anyone who wants a smart task manager, AI scheduler, and AI calendar in one powerful app. Why SubTask AI? • AI-Powered Productivity – Intelligent suggestions, auto-scheduling, smart reminders. • Smart & Simple – Fewer taps. Less stress. More done. • All-in-One Organizer – Task tracker, calendar planner, to-do list, habit builder. https://subtaskai.web.app/terms https://subtaskai.web.app/privacy

Screenshots

Calendars4 screens
Smart Tasks AI Scheduler4 screens

Verdict

The call

The clearest difference is review sentiment: Smart Tasks AI Scheduler at 100% against Calendars's 56%. Smart Tasks AI Scheduler also leads on iOS requirement (15.1 vs 18.2). Calendars's advantage is rating (4.7 vs 4.3) and ratings volume (122K vs 9). On price, update cadence, ads and in-app purchases 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. Calendars sells 18 in-app purchases, starting at $3.99 per month and Smart Tasks AI Scheduler sells 1 in-app purchase, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Calendars holds the better App Store score, 4.7 against 4.3. That said, the two scores are not equally well evidenced: Calendars has 122K ratings behind it against 9, so its average is the more settled of the two. Written reviews complicate that: 56% of Calendars's written reviews are positive against 100% of Smart Tasks AI Scheduler's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

Calendars ships an update weekly, Smart Tasks AI Scheduler every 4 days. The most recent releases landed on October 28, 2026 and October 7, 2026 respectively.

Scorecard6 real differences · 5 level
Calendars versus Smart Tasks AI Scheduler: the parameters behind the verdict, then further details
ParameterCalendarsSmart Tasks AI Scheduler
PriceFreeFree
Rating4.7 (122K ratings) — better4.3 (9 ratings)
Positive reviews55.8% of reviews100.0% of reviews — better
Number of ratings122K — better9
Update frequencyWeeklyEvery 4 days — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFreemium
Best chart rank#109 — better—
DevicesiPhone, iPad, Mac, Apple Watch — betteriPhone, iPod
Requires iOS18.215.1 — better
Further details — not scored
Size412 MB35 MB
Age rating4+4+
DeveloperReaddle Technologies LimitedSergey Grigorev

Customer experience

Calendars

All ratings122,379 ratings
Positive93.8%
Neutral3.1%
Negative3.1%
Written reviews1,286 reviews
Positive55.8%
Neutral8.6%
Negative35.6%

Smart Tasks AI Scheduler

All ratings9 ratings
Positive77.8%
Neutral11.1%
Negative11.1%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

Calendars

Reported bugs

3 issues
  • Disappearing events and appointments
  • Upgrade process causing data loss
  • Freezing and crashing on certain devices

Requested features

5 requests
  • Recurring events for free users
  • Customizable widgets and app icons
  • Ability to archive/restore past events
  • Improved Apple Watch integration
  • Shared calendars and family management

Smart Tasks AI Scheduler

Not enough reviews yet to summarise bugs or requests.

In-app purchases

18 purchases

Calendars

Subscriptions9
  • Calendars PRO 1 Month$3.991 Month
  • Calendars by Readdle: Interesting Calendars1 Month trial$3.991 Year
  • Calendars PRO 1 Month7 Days trial$3.991 Month
Show 6 more
  • Calendars PRO 1 Year3 Months trial$19.991 Year
  • Calendars PRO 1 Year7 Days trial2 variants$19.991 Year
  • Calendars PRO 1 Year1 Year trial$19.991 Year
  • Calendars PRO 1 Year14 Days trial$19.991 Year
  • Calendars PRO 1 Year7 Days trial$21.991 Year
  • Calendars PRO 1 Year7 Days trial$29.991 Year
One-time9
  • Calendars PRO LifetimeFree
  • Invites & Attendees Upgrade$1.99
  • Smart Input Upgrade$1.99
Show 6 more
  • Full Upgrade$4.99
  • Interesting Calendars$5.99
  • My schedule planner, Organizer$6.99
  • Full Pack$12.99
  • Reminders & Calendars$19.99
  • Recurring Events$31.99
1 purchases

Smart Tasks AI Scheduler

Subscriptions1
  • SubTask AI Premium Access7 Days trial$2.991 Month

Questions

Is Calendars free?
Calendars is free to download, with in-app purchases available.
Is Smart Tasks AI Scheduler free?
Smart Tasks AI Scheduler is free to download, with in-app purchases available.
Which has better reviews, Calendars or Smart Tasks AI Scheduler?
Calendars is rated higher. Calendars averages 4.7 out of 5 from 122K ratings, while Smart Tasks AI Scheduler averages 4.3 from 9 ratings.
Do Calendars or Smart Tasks AI Scheduler have ads?
Neither Calendars nor Smart Tasks AI Scheduler shows ads.
Which is updated more often, Calendars or Smart Tasks AI Scheduler?
Calendars ships an update weekly, and Smart Tasks AI Scheduler every 4 days. Most recently, Calendars was updated on October 28, 2026 and Smart Tasks AI Scheduler on October 7, 2026.

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