# Arbitrium vs Vimcal

The clearest difference is review sentiment: Arbitrium at 100% against Vimcal's 52%. Arbitrium also leads on rating (4.9 vs 4.7) and iOS requirement (15.6 vs 26.1). Vimcal's advantage is in-app purchases (none vs 1) and update cadence (every 5 days vs every 28 months). On price, ads and device support there is nothing between them.

Both are free to download. Arbitrium sells 1 one-off in-app purchase. Vimcal asks for nothing beyond the download.

Arbitrium holds the better App Store score, 4.9 against 4.7. That said, the two scores are not equally well evidenced: Vimcal has 469 ratings behind it against 11, so its average is the more settled of the two. Written reviews point the same way: 100% of Arbitrium's written reviews are positive against 52% of Vimcal's.

Arbitrium ships an update every 28 months, Vimcal every 5 days. The most recent releases landed on November 2, 2026 and November 7, 2026 respectively.

## The numbers

| Metric | Arbitrium | Vimcal |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (11 ratings)](https://appshunter.io/ios/app/arbitrium/id1369876075/reviews)** | [4.7 (469 ratings)](https://appshunter.io/ios/app/vimcal-ai-calendar-and-schedule/id1608841561/reviews) |
| Number of ratings | 11 | **469** |
| Positive reviews | **100.0% of reviews** | 52.2% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 28 months | **Every 5 days** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 8 MB | 73 MB |
| Requires iOS | **15.6** | 26.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [The Lost Project](https://appshunter.io/developer/380868134) | [Vimcal Inc.](https://appshunter.io/developer/1608841563) |

## What reviewers say

### Arbitrium

[App page](https://appshunter.io/ios/app/arbitrium/id1369876075)

This app assists in making rational decisions by allowing you to define criteria and rate your options. It uses a weighted decision matrix to help you identify the best choice for various life scenarios.

**Highlights:** Define decision criteria, Rate available options, Weighted decision matrix, Identify best choice, Save and manage decisions

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PRO Mode | $0.99 | one-time |


### Vimcal

[App page](https://appshunter.io/ios/app/vimcal-ai-calendar-and-schedule/id1608841561)

This calendar app streamlines scheduling for busy professionals and teams. It offers AI-powered scheduling, time zone management, and a clean interface to boost productivity and reduce meeting clutter.

**Highlights:** AI-powered scheduling, Time zone conversion (Time Travel), Availability sharing (Slots), Meeting decluttering (Rainbow Events), Fast and intuitive interface, Team scheduling capabilities

**Features:** Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 🚀 Fast and efficient
- 🤝 Great for managing multiple calendars
- ⏱️ Helpful time zone features
- 💻 Powerful desktop app
- 🎨 Clean and intuitive UI

**What reviewers complain about**

- 🐛 Bugs with date/time navigation
- 🔌 No offline support
- 🔍 Difficult to find/add local calendars
- 🔀 Issues with Google/Microsoft account integration
- 📱 Laggy and buggy mobile app

**Reported bugs**

- Scheduling links broken
- Randomly deleting meetings
- Inability to update meeting details
- Widget not showing all events

**Requested features**

- Integration with iCloud and other calendar services
- Full year view
- Better widget functionality
- Ability to feed external data into the calendar
- Apple Watch support


## Frequently asked questions

### Is Arbitrium free?

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

### Is Vimcal free?

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

### Which has better reviews, Arbitrium or Vimcal?

Arbitrium is rated higher. Arbitrium averages 4.9 out of 5 from 11 ratings, while Vimcal averages 4.7 from 469 ratings.

### Do Arbitrium or Vimcal have ads?

Neither Arbitrium nor Vimcal shows ads.

### Which is updated more often, Arbitrium or Vimcal?

Arbitrium ships an update every 28 months, and Vimcal every 5 days. Most recently, Arbitrium was updated on November 2, 2026 and Vimcal on November 7, 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.*