# Arbitrium — Take the right decision

> Rational decision-making tool using weighted criteria and option rating. (iPhone/iPad app by The Lost Project.)

- Source: https://appshunter.io/ios/app/arbitrium/id1369876075 (this page in markdown: same URL + `.md`)
- Developer: [The Lost Project](https://appshunter.io/developer/380868134)
- Category: Productivity, Utilities
- Price: Free with in-app purchases
- Rating: 4.90/5 from 11 App Store ratings · 10 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.6 · 8 MB
- Languages: American English, French (France), German (Germany), Italian, Japanese, Korean, European Spanish
- Released: 2018-06-15
- Data updated: 2026-08-17
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/arbitrium/id1369876075/reviews.md

## What is Arbitrium?

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?

## Key features

- Define decision criteria
- Rate available options
- Weighted decision matrix
- Identify best choice
- Save and manage decisions

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

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


## Recent user reviews (10 of 10)

All indexed reviews: https://appshunter.io/ios/app/arbitrium/id1369876075/reviews.md

### 5/5 — Neat app!!

*2026-01-06*

This helps me in clearing out the mental noise when I’m trying to get the most important things done.  I choose my projects (or problems)then one by one list my options to solve them and then my criteria ( like time, difficulty, importance, urgency, benefit to others)to make sure I’m picking the right option to get the task done. It’s worth the .99 cents and more.  Thanks

### 4/5 — Exactly what I was looking for…

*2024-04-01*

But please allow users to have their own ranking i.e. 1-5, 1-3

Not everyone benefits from 1-10

### 5/5 — Saved me from writing an app

*2023-09-17*

I regularly depend on weighted decision matrices to navigate my life. I started thinking about how an app that does this would look like. Lo and behold, The Lost Project has created one already, and it’s perfect. The only thing I can say is in my own matrices, I use a 1–5 scale instead of 1–9 for evaluating options. I suppose it doesn’t make a huge difference, but it could be a nice feature to add.

### 5/5 — Simple und gut 👍

*2022-10-03*

Einfach gehalten, aber zur Entscheidungsfindung wunderbar hilfreich

### 5/5 — 진짜 최고야 만든 사람 최고야

*2021-08-08*

덕분에 결정장애 극복이야... 고마워요

### 5/5 — Really neat app

*2018-12-08*

It helps to structure your thoughts and things to consider to help you weigh pros and cons. Then based on the results you can easily which options are best for you. It’s a much cooler way to write a pros and cons list. It even shows a graph to make seeing it easier.

### 5/5 — 디잔인도 깔끔하고 괜찮은것같습니다

*2018-11-28*

다만 질문의 구체성을 도와주는 코멘트가 추가되면 좋을것 같고 
앱 자체에서의 디자인을 변경하거나 다른 테마의 배경이 있으면 정말 좋을것 같습니다

### 5/5 — tolle app

*2018-10-21*

arbitrium ist eine einfache und durchdachte app, die in wenigen schritten ordnung in entscheidungsfragen bringen kann.

### 5/5 — Can’t think of anything better...

*2018-08-05*

So simple and efficient. I love apps like this - I hardly ever review things but felt I had to on this because it’s no frills, pragmatic, and does exactly what I expected and desired.

### 5/5 — Exactly what I wanted

*2018-07-13*

Many times over the years I’ve used a Weighted Decision Matrix to help me select from multiple choices.  Examples include deciding which car to buy and where to go on vacation. This app is perfect for these tasks.

## Frequently asked questions about Arbitrium

### What is Arbitrium?

Arbitrium is a productivity app designed to help users make rational decisions. It employs a weighted decision matrix concept, allowing users to establish criteria and rate various options to identify the best choice.

### How does Arbitrium help users make decisions?

Users input their decision criteria and then rate each potential option against these criteria. The app calculates a score for each option, highlighting the one with the highest score as the most rational choice.

### What types of decisions can Arbitrium help with?

Arbitrium can assist with a wide range of decisions, from personal choices like selecting a car or vacation destination to significant ones like choosing a mortgage bank or job offer.

### Is Arbitrium free to use?

Yes, Arbitrium is free to download and use. It also offers in-app purchases for additional features or content.

### Does Arbitrium have ads?

No, Arbitrium does not contain advertisements, providing an uninterrupted decision-making experience for users.

### What devices is Arbitrium available on?

Arbitrium is compatible with iPhone, iPad, and iPod devices, making it accessible to a broad range of Apple users.

### How often is Arbitrium updated?

The latest version of Arbitrium, 1.0.3, was released on August 27, 2024. Updates are provided by the developer, The Lost Project, to improve functionality and reliability.

### What is the age rating for Arbitrium?

Arbitrium has an age rating of 4+, making it suitable for users of all ages to utilize for decision-making assistance.

## Version history (last 4 releases)

### 1.0.3 — 2024-08-27

Bug fixes and general improvements.

### 1.0.2 — 2022-01-20

Bug fixes and general improvements.

### 1.0.1 — 2020-09-21

General improvements.

### 1.0.0 — 2018-05-22

No release notes.

## Apps similar to Arbitrium

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| --- | --- | --- | --- |
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| [Best Decision - decision maker](https://appshunter.io/ios/app/best-decision-decision-maker/id792954009) | 4.6 (98) | Free | Productivity |
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## More apps by The Lost Project

- [MyPlaces!](https://appshunter.io/ios/app/myplaces/id380868131)
- [Dreams: Your dream journal](https://appshunter.io/ios/app/dreams-your-dream-journal/id1225560667)
- [Destime](https://appshunter.io/ios/app/destime/id1536722511)
- [Monomo Journal](https://appshunter.io/ios/app/monomo-journal/id1611073062)

All apps by The Lost Project: https://appshunter.io/developer/380868134

## Related topics

[arbitrum](https://appshunter.io/ios/topics/arbitrum) · [pro mode](https://appshunter.io/ios/topics/pro-mode)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-17.*