Comparison

Atomic Calendar vs Studirum

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

Head to head
About

Atomic Calendar

Features
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Plan Confidently. Stay Organized. Stay Private. Atomic Calendar, part of the Atomic Blend suite, is your privacy-first calendar designed to organize your schedule, protect your data, and keep your life in sync โ€” all secured with end-to-end encryption. Why Atomic Calendar? โ€“ End-to-End Encrypted Events โ€“ Your events, titles, notes, and attendees are encrypted so only you can access them. โ€“ Private by Default โ€“ No tracking, no profiling, no behavioral analytics. Your schedule stays yours. โ€“ Simple & Focused Design โ€“ A fast, distraction-free interface to plan without friction. โ€“ Powerful Organization โ€“ Multiple calendars, color labels, search, and smart views to stay on top of your time. โ€“ Secure Sync Across Devices โ€“ Access your calendar everywhere while keeping your data private. โ€“ Unified with Atomic Blend โ€“ One subscription unlocks all apps in the suite. From daily planning to long-term projects, Atomic Calendar helps you stay organized with clarity โ€” without sacrificing your privacy or control. --- About Atomic Blend Atomic Blend is a privacy-first, 100% open-source app suite that includes Atomic Task, Atomic Notes, Atomic Mail, Atomic Calendar, and more โ€” all designed to work together seamlessly under a single subscription. Built for people who value simplicity, transparency, and control, Atomic Blend is your alternative to bloated, data-hungry SaaS tools. No ads. No tracking. Just powerful tools that respect you. --- Terms & Conditions: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://brandonguigo.notion.site/Politique-de-confidentialit-17591ec0b6688166b781cf05f89d3a2d

About

Studirum

Features
Read full description

Transform your study habits with Studirum: Study & Focus Timer. Designed with the motto "The Smartest Way to Study," Studirum is much more than a simple timer; it is your comprehensive digital study assistant tailored to help you reach your goals. Whether you are preparing for a tough exam or trying to organize your daily tasks, Studirum helps you focus, tracks your progress, and keeps your motivation at its peak. Focus. Track. Achieve Together! HIGHLIGHTED FEATURES: Advanced Pomodoro & Focus Timer Step away from distractions and work deeply. Seamlessly manage your study and break cycles with customizable Pomodoro durations and special notification sounds (success, break, alarm). Smart Task Management (To-Do List) Break your goals down into small, manageable pieces. Categorize your tasks into Daily, Weekly, and Monthly. Make the most of your time by tracking the remaining time for each task instantly. Daily Rhythm & Custom Reminders Build a solid study routine! Set independent daily, weekly, or monthly reminders to establish your personal study rhythm. Choose your favorite reminder sound and stay consistent. Remember: Studying at the same time every day increases focus by 40%! Detailed Statistics & Progress Tracking (Track) "You can't manage what you don't measure." Studirum turns your study sessions and completed goals into detailed charts. See how productive you are each day and step closer to your goals without breaking your study streaks. Achieve Together You don't have to study alone. Feel the power of the community behind you on the way to your goals with social features that will boost your motivation. Customizable Themes & Dark Mode Personalize your digital workspace. Boost your motivation by choosing from vibrant themes like Blue-Orange, Green-Purple, Pastel, or switch to the eye-friendly Dark Mode for late-night study sessions. WHY STUDIRUM? With its user-friendly, modern, and focus-driven interface, it not only gets you to sit at your desk but ensures you stay there productively. Add your tasks, start the timer, and see the difference without wasting time on complex settings. Download Studirum now to study smarter and unlock your potential!

Screenshots

Atomic Calendar4 screens
Studirum4 screens

Verdict

The call

Atomic Calendar and Studirum are too close to call on the numbers: across 6 compared parameters โ€” price, update cadence, ads and in-app purchases among them โ€” neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS

CostPrice ยท In-app purchases ยท Ads ยท Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Atomic Calendar ships an update every 3 weeks, Studirum monthly. The most recent releases landed on October 15, 2026 and October 2, 2026 respectively.

ScorecardNo meaningful differences
Atomic Calendar versus Studirum: the parameters behind the verdict, then further details
ParameterAtomic CalendarStudirum
PriceFreeFree
Update frequencyEvery 3 weeks โ€” betterMonthly
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.0 โ€” better15.1
Further details โ€” not scored
Size64 MB54 MB
Age rating4+4+
DeveloperBrandon GuigoOmer Aslan

In-app purchases

None

Atomic Calendar

No in-app purchases

None

Studirum

No in-app purchases

Questions

Is Atomic Calendar free?
Atomic Calendar is free to download, with no in-app purchases.
Is Studirum free?
Studirum is free to download, with no in-app purchases.
Do Atomic Calendar or Studirum have ads?
Neither Atomic Calendar nor Studirum shows ads.
Which is updated more often, Atomic Calendar or Studirum?
Atomic Calendar ships an update every 3 weeks, and Studirum monthly. Most recently, Atomic Calendar was updated on October 15, 2026 and Studirum on October 2, 2026.

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