Comparison

Opus One vs FlowBlock

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

Head to head
About

Opus One

This app helps you manage tasks and notes with a paperlike interface. Organize your day with daily task lists, schedules, and notes, and use a master task section to capture all your to-dos. Features include drag-and-drop reordering, event integration, and customizable notes.

Highlights
  • Master Task section
  • Daily Task lists with status, priority, and notes
  • Daily Schedule and Event integration
  • Daily Notes with customizable text formatting
  • Drag and drop task reordering
  • Cloud synchronization
  • Sketch drawing canvas
Features
Read full description

Opus One is a real day planner, not another to-do app. Each day gets its own page — tasks with A/B/C priorities, your schedule, and notes — on a planner that looks and feels like paper. Plan on iPhone, iPad, and Mac, and it all stays in sync. YOUR DAY ON ONE PAGE • Daily Tasks with A/B/C priorities, status, notes, and alarms. • A schedule that shows your Calendar events alongside your tasks. • Drag a task onto the schedule — with task durations, the end time fills in automatically. • Daily Notes with photos, PDFs, checklists, and audio. • Today's weather and a daily quote, right on the page. PLAN BEYOND TODAY • Master Tasks: everything on your mind in one list, no due date required. • Goals with timelines, photos, and progress you can see. • Roles: review the areas of your life each week so nothing important gets crowded out. • Mission, Values, and Vision pages to keep the big picture one tap away. • Meeting Planner for agendas, decisions, and next steps. NOTES AND JOURNALS • Rich notes with fonts, colors, tags, and your own custom sections. • Sketch and handwrite with Apple Pencil. • Journals with 25 covers to choose from, plus a guided Gratitude Journal. IT GOES WHERE YOU GO • Home Screen widgets for today's tasks, your mission, your values, and daily quotes. • Live Activities keep today's tasks on your Lock Screen. • Add a task from Control Center, or ask Siri. • Apple Watch app to see your day and check off tasks from your wrist. • iCloud sync across iPhone, iPad, and Mac. MAKE IT YOURS • Planner themes, including seasonal ones. • Task-complete sounds and rewards for finishing what you planned. • Color-coded categories and repeating rules with advanced options. OPUS ONE PRO The core planner is free. Opus One Pro adds cloud sync across all your devices, weather, attachments (images, PDFs, audio), Apple Pencil sketching, categories, repeating rules, Goals, Siri, and themes. One subscription covers iPhone, iPad, and Mac on the same iCloud account. Available yearly or monthly. Subscription details: Payment is charged to your Apple Account at confirmation of purchase. The subscription renews automatically unless auto-renew is turned off at least 24 hours before the end of the current period, and your account is charged for renewal within 24 hours before the period ends. Manage or cancel in your Account Settings. Privacy Policy: https://piso13.com/privacy-policy-2/ Terms of Service: https://piso13.com/terms-of-service/

About

FlowBlock

Features
Read full description

Most planners give you a list and leave the hard part to you: deciding what to do, and when. FlowBlock builds the day for you. Tell it what needs doing and roughly how long it takes. It finds the hours, works around the things you can't move, and re-plans when the day changes. Open it and there is one block on screen: the one to do now. WHAT IT DOES • Auto-scheduling. Your tasks get real times in the hours you actually work, with breathing room built in. • One block at a time. The Up Now card picks the block that fits the hour, so there is no list to sort through. • Routines that bend. "Every day", "3× a week", "2 weeks after I last did it". Fixed at an hour, or just first thing or last thing. • Flow sessions. A timer that knows which block it belongs to, on your Lock Screen and your Apple Watch. • Not now, without guilt. Push a block to later, the evening or tomorrow. It comes back on its own. • Widgets. See your day on the Home and Lock Screen, and tick a block done from the Home Screen. • Made for iPad. Your pages in a sidebar, a block's details beside the list, and a week where you can draw new blocks and move them. BUILT FOR BRAINS THAT DON'T DO LISTS A streak that survives a rest day. No red overdue badges. Miss a day and FlowBlock simply re-plans, because that is what a plan is for. ON EVERY SCREEN YOU USE iPhone, iPad, Apple Watch, and the web app at app.flow-block.com for planning at your desk. One account, always in sync. SUBSCRIPTION FlowBlock is free for 14 days, no card needed. After that, one Flow Pass subscription covers iPhone, iPad, Apple Watch and the web app. Flow Pass Monthly: US$11.99 per month. Flow Pass Yearly: US$89.99 per year. Local pricing is shown in the app before you subscribe. Payment is charged to your Apple Account at confirmation of purchase. The subscription renews automatically unless it is cancelled at least 24 hours before the end of the current period. Manage or cancel it any time in your Apple Account settings. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://flow-block.com/privacy Terms of Service: https://flow-block.com/terms

Screenshots

Opus One4 screens
FlowBlock4 screens

Verdict

The call

The clearest difference is update cadence: FlowBlock at every 5 days against Opus One's every 3 weeks. Opus One's advantage is iOS requirement (15.0 vs 17.0). 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. Opus One sells 2 in-app purchases, starting at $4.99 per month and FlowBlock sells 2 in-app purchases, starting at $11.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Opus One ships an update every 3 weeks, FlowBlock every 5 days. The most recent releases landed on November 1, 2026 and October 28, 2026 respectively.

Scorecard2 real differences · 8 level
Opus One versus FlowBlock: the parameters behind the verdict, then further details
ParameterOpus OneFlowBlock
PriceFreeFree
Rating4.7 (984 ratings) — better—
Positive reviews65.7% of reviews—
Number of ratings984 — better—
Update frequencyEvery 3 weeksEvery 5 days — better
AdsNoNo
In-app purchasesYesYes
MonetizationSubscription—
DevicesiPhone, iPad, iPod, Apple Watch — betteriPhone, iPad, Apple Watch
Requires iOS15.0 — better17.0
Further details — not scored
Size187 MB45 MB
Age rating4+4+
DeveloperPISO 13, Inc.Alikhan Bulatov

Bugs and requests

Opus One

Reported bugs

4 issues
  • Sync issues between devices
  • App crashes and data loss
  • Keyboard not working on iPad
  • Distorted font in calendar view

Requested features

6 requests
  • Add weekly and monthly views
  • Improve Apple Pencil support
  • Add project management features
  • Integrate with more calendar/task apps
  • Provide better training and tutorials
Show 1 more
  • Allow customization of UI and themes

FlowBlock

Not enough reviews yet to summarise bugs or requests.

In-app purchases

2 purchases

Opus One

Subscriptions2
  • Opus One Pro7 Days trial$4.991 Month
  • Opus One Professional7 Days trial$39.991 Year
2 purchases

FlowBlock

Subscriptions2
  • Flow Pass$11.991 Month
  • Flow Pass1 Year trial$89.991 Year

Questions

Is Opus One free?
Opus One is free to download, with in-app purchases available.
Is FlowBlock free?
FlowBlock is free to download, with in-app purchases available.
Do Opus One or FlowBlock have ads?
Neither Opus One nor FlowBlock shows ads.
Which is updated more often, Opus One or FlowBlock?
Opus One ships an update every 3 weeks, and FlowBlock every 5 days. Most recently, Opus One was updated on November 1, 2026 and FlowBlock on October 28, 2026.

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