Comparison

Simple Calendar vs GRIDD PRO

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

Head to head
About

Simple Calendar

Organize your tasks and schedule with a clean, minimalist interface. Plan your day using time blocks, set reminders for important events, and manage tasks in an intuitive inbox. Track your progress with daily and weekly statistics.

Highlights
  • Time blocking for daily planning
  • Specific time reminders and notifications
  • Intuitive inbox for unscheduled tasks
  • Calendar view with daily/weekly statistics
  • Customizable categories and priorities
  • Dark mode support
  • Repeating tasks
Features
Read full description

Get organized and stay on top of your tasks with Quarterplan - the ultimate minimal task management app. With a clean and minimal design, you can focus on what's important and get things done. Plan your day with ease using our unique time block feature Never forget important tasks and events with specific time reminders and notifications Stay on top of your GTD or custom workflow with our intuitive inbox feature Keep track of your progress with our calendar view and daily/weekly statistics Customize your experience with dark mode, categories, and priorities And the best part? Most features are available for free, with the option to upgrade for additional benefits such as unlimited categories and notifications. Time Blocks Quickly plan your day in 3 hour time blocks and easily check your progress throughout the day in the calendar view. Specific Time with Notification Specify a specific time and set a reminder to make sure that you don’t forget important events and tasks. Inbox Or for any tasks that doesn't have a specific time or date, or if you are following GTD or your own custom workflow then simply add tasks to your inbox. Try It - It’s Free Most of the features are available for free (calendar, inbox, checklists, notes, repeating tasks, daily and weekly statistics, dark mode, up to 5 categories and priorities), and if your require more then a subscription will give you unlimited categories and priorities, notifications, monthly statistics and cloud storage. -- FEATURES -- - CALENDAR A calendar for scheduling tasks and appointments - INBOX An inbox for ideas, lists, projects and any tasks that doesn’t have a fixed date - CHECKLISTS For when you need to break down your task into smaller actions - DARK MODE For evenings or when you want to surrender to the dark side - REPEATING TASKS Create tasks that repeat every day, week, month or year - CATEGORIES & PRIORITIES Create up to 5 custom categories and priorities to define your own workflow - STATISTICS Daily and weekly statistics gives you a clear overview of your activity -- PRO FEATURES -- - NOTIFICATIONS Reminders make sure you don’t miss anything important - CATEGORIES & PRIORITIES Create unlimited custom categories and priorities to define your own workflow - STATISTICS Monthly statistics gives you a clear overview of your activity -- Membership -- - Payment will be charged to iTunes Account at confirmation of purchase - Subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period - Account will be charged for renewal within 24-hours prior to the end of the current period, and identify the cost of the renewal - Subscriptions may be managed by the user and auto-renewal may be turned off by going to the user's Account Settings after purchase - Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription to that publication, where applicable Privacy policy: https://www.quarterplan.com/privacy_policy.html Terms of use: https://www.quarterplan.com/terms_conditions.html -- MAKE IT YOURS -- Quarterplan is flexible so that you can use your own work flow and methodologies. Create your own categories and priorities so that the Inbox works for you, whether you use GTD, The Action Method, 20/80 or your own custom setup. Please feel free to contact us if you have any feedback or questions: human@raemedy.com

About

GRIDD PRO

Read full description

GRIDD PRO® - Social Diagnostics, developed by Violence Prevention Network, is based on 25 years of interdisciplinary expertise. Our innovative app offers a comprehensive, practice-oriented method for analysing and developing individual intervention strategies. Tailor-made for extremism prevention professionals, GRIDD PRO® - Social Diagnostics combines a holistic case approach with dynamic adaptability, ensuring efficient documentation and continuous reflection. Increase the quality and sustainability of your work with a tool developed by practitioners for practitioners. Professionalise your counselling process with GRIDD PRO® - Social Diagnostics, because effective prevention starts with the exact analysis.

Screenshots

Simple Calendar4 screens
GRIDD PRO4 screens

Verdict

The call

The clearest difference is in-app purchases: GRIDD PRO at none against Simple Calendar's 2. Simple Calendar's advantage is update cadence (every 4 weeks vs every 5 months). On price, 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

Both are free to download. Simple Calendar sells 2 in-app purchases, starting at $1.99 per month. GRIDD PRO asks for nothing beyond the download.

UpkeepUpdate frequency

Simple Calendar ships an update every 4 weeks, GRIDD PRO every 5 months. Both last shipped on October 2, 2026.

Scorecard2 real differences · 8 level
Simple Calendar versus GRIDD PRO: the parameters behind the verdict, then further details
ParameterSimple CalendarGRIDD PRO
PriceFreeFree
Rating3.6 (9 ratings) — better—
Positive reviews40.0% of reviews—
Number of ratings9 — better—
Update frequencyEvery 4 weeks — betterEvery 5 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFreemium—
DevicesiPhone, iPodiPhone, iPod
Requires iOS13.413.0 — better
Further details — not scored
Size41 MB17 MB
Age rating4+17+
DeveloperRaemedy LimitedViolence Prevention Network gGmbH

In-app purchases

2 purchases

Simple Calendar

Subscriptions2
  • Quarterplan Pro Monthly$1.991 Month
  • Quarterplan Pro Yearly$11.991 Year
None

GRIDD PRO

No in-app purchases

Questions

Is Simple Calendar free?
Simple Calendar is free to download, with in-app purchases available.
Is GRIDD PRO free?
GRIDD PRO is free to download, with no in-app purchases.
Do Simple Calendar or GRIDD PRO have ads?
Neither Simple Calendar nor GRIDD PRO shows ads.
Which is updated more often, Simple Calendar or GRIDD PRO?
Simple Calendar ships an update every 4 weeks, and GRIDD PRO every 5 months. Most recently, Simple Calendar was updated on October 2, 2026 and GRIDD PRO on October 2, 2026.

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