Comparison

Calflow vs Random Reminder

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

Head to head
About

Calflow

This app integrates with your existing iOS Reminders and Calendars to help you track how you spend your time. It offers features for daily planning, time tracking, and goal setting, providing insights into your productivity within the Apple ecosystem.

Highlights
  • 2-way sync with iOS Reminders & Calendar
  • Time tracking for reminders and events
  • Time distribution insights
  • Powerful tag system for filtering
  • Goal and habit tracking
  • Apple Health and app usage sync
Features
Read full description

If you’re using Apple Reminders and iOS Calendar/ Google Calendar in your workflow, and you wonder how you spend your time, tasks, daily activities, etc, it’s for you. Calflow is a powerful time-tracking planner based on iOS Reminders & Calendar, helping you keep track of your day and stay productive within the Apple ecosystem. Daily & Weekly Planner ◆ 2-way sync with iOS Reminders & Calendar (Free) ◆ Use Spaces to separate personal and work tasks, helping you declutter your schedule and stay focused Streamline Time-tracking into your Apple Workflow ◆ Track how much time you spend on your Reminders & events: - Reminders: Auto-populate time entries in Apple Calendar - Events: Auto-update your planned event details in Apple Calendar Apple Calendar Time Insights ◆ Also supports Google Calendar ◆ Track your time distribution across day/week/month/year Powerful Tag System ◆ Create smart tags to filter your calendar event entries, and learn about their activity across day/week/month/year ◆ Create groups to analyze time from multiple perspectives Goals, Habits Tracking ◆ Track goals, habits based on your iOS Reminders & Calendars to help ensure your time align with your goals Track anything and sync them to iOS Calendar ◆ Apple Health sync (mindful minutes, sleep time, workout time) ◆ App usage time tracking (via Shortcuts) ◆ Daily activities (via tracker widgets) Need help or have ideas to share? We’re always here: contact@calflow.app Terms of Use(EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://calflow.app/privacypolicy/

About

Random Reminder

This app helps you achieve deep focus quickly through a unique method involving random sound reminders and short breaks. It's designed to improve attention, memory, and learning performance by leveraging principles like neural replay and ultradian rhythms.

Highlights
  • Random sound interval reminders
  • 10-second micro-breaks
  • 90-minute focus sessions
  • Neural replay for memory
  • Variable ratio reinforcement
  • Zeigarnik effect utilization
Features
Read full description

“Random Reminder” is a new focus method designed to help you enter deep focus quickly. More than 400 people worldwide use it every second. With this method, you can stay focused for up to 90 minutes, improve your attention and memory, and enter a flow state more easily. == A New Focus Method == - Set a sound to play at random intervals (e.g., every 3–5 minutes). - Each time you hear the reminder sound, immediately close your eyes and rest for 10 seconds. - Then return to your work or study and continue focusing. Repeat this process until the 90-minute session ends. - After 90 minutes, take a 20-minute break. == Based on Four Core Principles == ■ Neural Replay During micro-breaks, your brain "replays" recently learned information at high speeds, improving memory retention and learning performance. ■ Variable Ratio Reinforcement Randomized feedback keeps the brain’s dopamine system engaged. Not knowing exactly when the next sound will occur maintains a healthy level of alertness and motivation. ■ Zeigarnik Effect Briefly interrupting a task creates a psychological "open loop." This makes your brain more eager to complete the task, helping you dive back in more effectively. ■ Ultradian Rhythms (90/20 Rule) The human brain naturally operates in 90-minute high-frequency cycles. Following this rhythm prevents burnout and maximizes mental endurance. ====== Personal growth website: https://zeenzeen.com Creator: 择恩 ====== “Random Reminder” can be downloaded and used for free. Core features are completely free. We also offer premium membership features to enhance the user experience. If you choose to subscribe to the premium membership, your iTunes account will be charged accordingly. Subscriptions renew automatically unless canceled at least 24 hours before the end of the current subscription period. After subscribing, you can manage your subscription in your iTunes Store account settings. Privacy Policy https://zeenzeen.com/privacy Terms of Use https://zeenzeen.com/tos End User License Agreement https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Calflow4 screens
Random Reminder4 screens

Verdict

The call

The clearest difference is rating: Calflow at 4.9 against Random Reminder's 4.6. Calflow also leads on ratings volume (129 vs 18). Random Reminder's advantage is iOS requirement (15.0 vs 17.0). On price, review sentiment, update cadence and ads 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. Calflow sells 3 in-app purchases, starting at $3.99 per month and Random Reminder sells 4 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Calflow holds the better App Store score, 4.9 against 4.6. That said, the two scores are not equally well evidenced: Calflow has 129 ratings behind it against 18, so its average is the more settled of the two. Written reviews point the same way: 89% of Calflow's written reviews are positive against 83% of Random Reminder's.

UpkeepUpdate frequency

Calflow ships an update every 10 days, Random Reminder weekly. The most recent releases landed on October 23, 2026 and October 14, 2026 respectively.

Scorecard3 real differences · 7 level
Calflow versus Random Reminder: the parameters behind the verdict, then further details
ParameterCalflowRandom Reminder
PriceFreeFree
Rating4.9 (129 ratings) — better4.6 (18 ratings)
Positive reviews88.9% of reviews — better83.3% of reviews
Number of ratings129 — better18
Update frequencyEvery 10 daysWeekly — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFreemium
DevicesiPhone, iPad, Mac, Apple WatchiPhone, iPad, iPod, Apple Watch
Requires iOS17.015.0 — better
Further details — not scored
Size183 MB43 MB
Age rating4+4+
DeveloperKyovan Ltd.志高 谢

Customer experience

Calflow

All ratings129 ratings
Positive98.4%
Neutral0.8%
Negative0.8%
Written reviews108 reviews
Positive88.9%
Neutral4.6%
Negative6.5%

Random Reminder

All ratings18 ratings
Positive88.9%
Neutral5.6%
Negative5.6%
Written reviews6 reviews
Positive83.3%
Neutral16.7%
Negative0.0%

Bugs and requests

Calflow

Reported bugs

11 issues
  • Timer doesn't sync across devices (iPhone to iPad/Mac)
  • Live Activity not showing on iPad when timer active
  • Apple Watch timers not accessible on other devices
  • Widget display showing only black and white screen
  • Insights double-counting time on existing calendar events
Show 6 more
  • Goals feature sometimes fails to record correctly
  • iPad reminders list not syncing with iPhone
  • Timer in notification center and widget not syncing
  • iPad doesn't show timer notifications in notification center
  • Apple Watch connectivity issues after paid subscription activation
  • Mac and iPad timer not showing when started on iPhone

Requested features

27 requests
  • Dark mode support
  • Mac menu bar timer widget
  • Multiple simultaneous timers on iPhone
  • Larger font size options
  • Ability to copy and paste calendar events
Show 22 more
  • Custom goal cadences (not just daily/weekly/monthly)
  • Daily focus note area (like weekly focus)
  • Hashtag support in notes for better app integration
  • Apple Watch complications
  • Faster widget refresh rates
  • Drag and drop support for weekly plans
  • Collaboration/sharing features
  • Data export to CSV/Excel format
  • URL field for events and tasks
  • Callback URL support
  • Notification/reminder alerts for events
  • Milestone and skill tree features
  • Import data from other time tracking apps
  • Japanese language support
  • Custom day start time for analytics
  • Notebook/note-taking integration
  • Customizable todo background colors
  • Reminders list and tags binding
  • Mac automation scheduling
  • Website usage tracking on Mac
  • Ambient sounds and tick sounds for focus mode
  • Collaborative task management

Random Reminder

Not enough reviews yet to summarise bugs or requests.

In-app purchases

3 purchases

Calflow

Subscriptions2
  • Monthly plan$3.991 Month
  • Annual plan7 Days trial$12.991 Year
One-time1
  • One-time purchase$37.99
4 purchases

Random Reminder

Subscriptions3
  • 月度高级会员$2.991 Month
  • 季度高级会员$9.993 Months
  • 年度高级会员$24.991 Year
One-time1
  • 违约成本$0.99

Questions

Is Calflow free?
Calflow is free to download, with in-app purchases available.
Is Random Reminder free?
Random Reminder is free to download, with in-app purchases available.
Which has better reviews, Calflow or Random Reminder?
Calflow is rated higher. Calflow averages 4.9 out of 5 from 129 ratings, while Random Reminder averages 4.6 from 18 ratings.
Do Calflow or Random Reminder have ads?
Neither Calflow nor Random Reminder shows ads.
Which is updated more often, Calflow or Random Reminder?
Calflow ships an update every 10 days, and Random Reminder weekly. Most recently, Calflow was updated on October 23, 2026 and Random Reminder on October 14, 2026.

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