Arbitrium vs Vimcal
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Arbitrium
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.
- Define decision criteria
- Rate available options
- Weighted decision matrix
- Identify best choice
- Save and manage decisions
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We often have to take decisions. Arbitrium is an app that will help you take the right one in a simple and rational way. Establish the criteria you need to consider and then rate each option you have available. The option with the highest score will be the best one. Arbitrium is based on the weighted decision matrix concept and will help you take decisions such as: Which car should I buy? Which bank should I choose for a mortgage? Where should I go on vacation? Which job offer should I accept? Which nursery should I choose for my child?
Vimcal
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.
- AI-powered scheduling
- Time zone conversion (Time Travel)
- Availability sharing (Slots)
- Meeting decluttering (Rainbow Events)
- Fast and intuitive interface
- Team scheduling capabilities
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Vimcal is the ultimate calendar designed for busy professionals and their teams. We invested two years into understanding the pain points of our first 10,000 users through 1:1 Zoom calls. This allowed us to map out all the different scenarios of corporate scheduling. The result? The world's fastest and most intuitive calendar app, built to streamline scheduling and boost your productivity at work, as well as the most robust harness for agentic scheduling. In Vimcal, you can accomplish anything you would in another calendar, but in half the steps or fewer and with no error. AGENTIC SCHEDULING Scheduling with voice, screenshots, or your AI personal assistant. Vimcal holds proprietary context about your meetings such as whether it's internal vs external, how important it is, or how many times it's already been rescheduled. Vimcal provides you the sturdiest guardrails for your time. BUILT FOR TEAMS Scheduling with your team is so much more complicated than just seeing what's open or blocked on the calendar. When your entire team uses Vimcal, all of Vimcal's context allows for the most accurate scheduling that aligns with everyone's schedules. NO MORE TIME ZONE PROBLEMS Time Travel — Find the best time between you and any other time zone in the world without any mental math. SCHEDULE WITH A PERSONAL TOUCH Slots — Sending a booking link feels transactional, but typing out your free times instead is tedious. Get the best of both worlds with our drag-and-copy availability feature! DECLUTTER BEAUTIFULLY Rainbow Events — No one likes seeing a full calendar. Let Vimcal take care of unnecessary meetings and declutter your mind. BUTTERY SMOOTH EVERYTHING 100ms Rule — We obsessively test every tap and interaction to give you the silkiest, fastest mobile experience. Upgrade your productivity and take control of your schedule with Vimcal. Download now and revolutionize the way you manage your time.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Arbitrium | Vimcal |
|---|---|---|
| Price | Free | Free |
| Rating | 4.9 (11 ratings) — better | 4.7 (469 ratings) |
| Positive reviews | 100.0% of reviews — better | 52.2% of reviews |
| Number of ratings | 11 | 469 — better |
| Update frequency | Every 28 months | Every 5 days — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.6 — better | 26.1 |
| Further details — not scored | ||
| Size | 8 MB | 73 MB |
| Age rating | 4+ | 4+ |
| Developer | The Lost Project | Vimcal Inc. |
Customer experience
Arbitrium
Vimcal
Bugs and requests
Arbitrium
Not enough reviews yet to summarise bugs or requests.
Vimcal
Reported bugs
4 issues- Scheduling links broken
- Randomly deleting meetings
- Inability to update meeting details
- Widget not showing all events
Requested features
5 requests- Integration with iCloud and other calendar services
- Full year view
- Better widget functionality
- Ability to feed external data into the calendar
- Apple Watch support
In-app purchases
Arbitrium
- PRO Mode$0.99
Vimcal
No in-app purchases









