Comparison

Flow Interval vs Haiku Ring

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

Head to head
About

Flow Interval

Features
Read full description

Flow Interval – Customizable Step Timer Build your perfect routine with connected timers. Flow Interval lets you create flexible timer sequences for any activity — from high-intensity interval training (HIIT) and yoga flows to Pomodoro study sessions and cooking routines. Key Features: • Flexible Timer Sequences Add unlimited steps and combine “Work,” “Rest,” and “Prep” intervals in any order. • Clear, Intuitive Visuals A circular progress indicator and clean interface show exactly where you are and what’s coming next. • Effortless Editing Duplicate, reorder, and fine-tune steps with ease. Copying “Round 1” instantly creates “Round 2.” • Custom Alerts Choose from multiple sound effects and vibration options to match your style. • Background Support Stay on track with notifications, even when the app is in the background or your screen is locked. • Privacy First No accounts. No tracking. All data stays on your device. Ideal For: • Fitness — HIIT, Tabata, yoga, stretching • Productivity — Pomodoro, presentations, deep work • Lifestyle — meditation, cooking, daily routines Focus on what matters. Let Flow Interval handle the time. Download now and find your flow.

About

Haiku Ring

This app offers a visual approach to daily planning, transforming your schedule into a 24-hour clock. Easily organize tasks, capture thoughts, and review your week at a glance. Gentle reminders help keep you on track.

Highlights
  • Visual 24-hour clock planning
  • Color-coded task arcs
  • Brain dump for unscheduled tasks
  • Weekly overview in clock layout
  • Gentle reminder notifications
  • Calendar sync (Pro)
Features
Read full description

Haiku is a calm visual planner that turns your day into a 24-hour clock. Instead of juggling crowded calendar grids and long task lists, Haiku helps you see your time as a clear visual flow. Plan tasks, capture loose thoughts, review your week, and understand your schedule at a glance. VISUAL DAILY PLANNING - Organize your day on a 24-hour clock - See tasks as color-coded arcs around your schedule - Move and adjust tasks to better fit your day - View your current and upcoming time blocks more clearly BRAIN DUMP - Quickly capture unscheduled tasks in one place - Keep ideas, reminders, and to-dos out of your head - Schedule tasks later when you’re ready WEEKLY VIEW - Review your week in a visual clock layout - Switch to a calendar-style weekly view - Spot open days, busy blocks, and patterns across the week GENTLE REMINDERS - Get optional notifications before tasks begin - Use simple reminder offsets in the free version - Unlock custom reminder times with Haiku Pro INSIGHTS - Track your total planned time - See top activities and category breakdowns - Discover your peak focus window and weekly momentum with Haiku Pro SYNC AND PERSONALIZATION - Optional sync with Apple Calendar and Google Calendar through Haiku Pro - iCloud sync for your Haiku task data when available - Choose from multiple themes - Switch between 12-hour and 24-hour time HAIKU PRO Haiku Pro unlocks advanced insights, custom reminder times, two-way calendar sync, and Home Screen widgets. PRIVATE BY DESIGN Haiku works without creating an account. Calendar access is optional and only requested if you choose to connect a calendar. Google Sign-In is only used if you choose Google Calendar sync. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://haikuapp.xyz/privacy.html

Screenshots

Flow Interval4 screens
Haiku Ring4 screens

Verdict

The call

The clearest difference is update cadence: Haiku Ring at every 5 days against Flow Interval's every 3 months. Haiku Ring also leads on iOS requirement (18.0 vs 26.0). On price, ads, in-app purchases and device support 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. Flow Interval sells 3 one-off in-app purchases and Haiku Ring sells 3 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Flow Interval ships an update every 3 months, Haiku Ring every 5 days. The most recent releases landed on October 7, 2026 and October 6, 2026 respectively.

Scorecard2 real differences · 7 level
Flow Interval versus Haiku Ring: the parameters behind the verdict, then further details
ParameterFlow IntervalHaiku Ring
PriceFreeFree
Rating—5.0 (2 ratings) — better
Number of ratings—2 — better
Update frequencyEvery 3 monthsEvery 5 days — better
AdsNoNo
In-app purchasesYesYes
Monetization—Freemium
DevicesiPhone, iPadiPhone, iPad
Requires iOS26.018.0 — better
Further details — not scored
Size1 MB19 MB
Age rating4+4+
DeveloperTakumi KanayaRESWIN BIJU KANDATHIL

In-app purchases

3 purchases

Flow Interval

One-time3
  • Small Tip$0.99
  • Medium Tip$3.99
  • Large Tip$8.99
3 purchases

Haiku Ring

Subscriptions2
  • Haiku Pro Monthly$3.991 Month
  • Haiku Pro Annual7 Days trial$19.991 Year
One-time1
  • Haiku Pro Lifetime$9.99

Questions

Is Flow Interval free?
Flow Interval is free to download, with in-app purchases available.
Is Haiku Ring free?
Haiku Ring is free to download, with in-app purchases available.
Do Flow Interval or Haiku Ring have ads?
Neither Flow Interval nor Haiku Ring shows ads.
Which is updated more often, Flow Interval or Haiku Ring?
Flow Interval ships an update every 3 months, and Haiku Ring every 5 days. Most recently, Flow Interval was updated on October 7, 2026 and Haiku Ring on October 6, 2026.

Other comparisons