# Opus One vs Dimo

The clearest difference is in-app purchases: Dimo at none against Opus One's 2. Dimo also leads on iOS requirement (12.0 vs 15.0). Opus One's advantage is update cadence (every 3 weeks vs every 18 months). On price, ads and device support there is nothing between them.

Both are free to download. Opus One sells 2 in-app purchases, starting at $4.99 per month. Dimo asks for nothing beyond the download.

Opus One ships an update every 3 weeks, Dimo every 18 months. The most recent releases landed on October 3, 2026 and September 11, 2026 respectively.

## The numbers

| Metric | Opus One | Dimo |
| --- | --- | --- |
| Price | Free | Free |
| 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 | **No** |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 18 months |
| Monetization | Subscription | — |
| Size | 184 MB | 40 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [PISO 13, Inc.](https://appshunter.io/developer/940653452) | [DIMO DIAGNOSTIC](https://appshunter.io/developer/1648456040) |

## 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


### Dimo

[App page](https://appshunter.io/ios/app/dimo/id6443696976)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Opus One free?

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

### Is Dimo free?

Dimo is free to download, with no in-app purchases.

### Do Opus One or Dimo have ads?

Neither Opus One nor Dimo shows ads.

### Which is updated more often, Opus One or Dimo?

Opus One ships an update every 3 weeks, and Dimo every 18 months. Most recently, Opus One was updated on October 3, 2026 and Dimo on September 11, 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.*