# Opus One vs Countdown Builder

The clearest difference is price: Opus One at Free against Countdown Builder's $0.99. Opus One also leads on ads (none vs shown) and iOS requirement (15.0 vs 17.0). On update cadence, in-app purchases and device support there is nothing between them.

Opus One is free to download; Countdown Builder costs $0.99 up front. Opus One sells 2 in-app purchases, starting at $4.99 per month and Countdown Builder sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Opus One ships an update every 3 weeks, Countdown Builder every 2 weeks. The most recent releases landed on September 30, 2026 and September 29, 2026 respectively.

## The numbers

| Metric | Opus One | Countdown Builder |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | **[4.7 (955 ratings)](https://appshunter.io/ios/app/opus-one-digital-planner/id941852977/reviews)** | — |
| Number of ratings | **955** | — |
| Positive reviews | 65.7% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 3 weeks | **Every 2 weeks** |
| Monetization | Subscription | — |
| Size | 184 MB | 11 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [PISO 13, Inc.](https://appshunter.io/developer/940653452) | [Kalavathi Ekambaram](https://appshunter.io/developer/912222873) |

## What reviewers say

### Opus One

[App page](https://appshunter.io/ios/app/opus-one-digital-planner/id941852977)

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:** Family Sharing, Siri integration, Apple Watch app, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Opus One Pro | $4.99 | per month |
| Opus One Professional | $39.99 | per year |

**What reviewers like**

- 🚀 Life changing
- 👍 Great app and support
- 👍 Integrates well with iPhone
- 👍 Keeps me organized and efficient
- 👍 Seamless sync across devices

**What reviewers complain about**

- 🐛 Sync issues and reliability problems
- 🐛 Lost data and app crashes
- 🔒 Concerns about free trial sign-ups
- 🔒 Difficult to cancel subscription
- 👎 Lacks weekly/monthly views

**Reported bugs**

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

**Requested features**

- Add weekly and monthly views
- Improve Apple Pencil support
- Add project management features
- Integrate with more calendar/task apps
- Provide better training and tutorials


### Countdown Builder

[App page](https://appshunter.io/ios/app/countdown-builder/id6745096791)

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| EventCountdown Premium | $0.99 | one-time |


## Frequently asked questions

### Is Opus One free?

Opus One is free to download, with in-app purchases available.

### Is Countdown Builder free?

Countdown Builder costs $0.99, and also offers in-app purchases.

### Do Opus One or Countdown Builder have ads?

Countdown Builder shows ads; Opus One does not.

### Which is updated more often, Opus One or Countdown Builder?

Opus One ships an update every 3 weeks, and Countdown Builder every 2 weeks. Most recently, Opus One was updated on September 30, 2026 and Countdown Builder on September 29, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*