# Libra - Rating Calculator

> Calculate player skill ratings in competitive leagues using a flexible TrueSkill-based system. (iPhone/iPad app by Cameron Mulhern.)

- Source: https://appshunter.io/ios/app/libra-rating-calculator/id1615814183 (this page in markdown: same URL + `.md`)
- Developer: [Cameron Mulhern](https://appshunter.io/developer/442750837)
- Category: Sports, Utilities
- Price: Free
- Rating: 5.00/5 from 1 App Store ratings
- Age rating: 4+
- Requires: iOS 14.0 · 3 MB
- Languages: English
- Released: 2022-03-24
- Data updated: 2026-07-05
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/libra-rating-calculator/id1615814183/reviews.md

## What is Libra?

Measure the skill of individuals within a range of competitive environments using the Libra app.

• Create leagues to track a set of players across a series of matches
• Record your match results
• Check the leaderboard to see the ratings of players in your league

The Libra rating system is very flexible
• Supports any number of teams
• Supports different numbers of players per team
• Supports different team and player sizes across matches

The current rating system is a poor fit for some games
• Those that include draws
• Those where players can change teams during a match
• Those where some teams are systematically advantaged

The rating system used by Libra is based on TrueSkill, which models the skills of players as a Gaussian. The ratings in the app are displayed using three numbers, which represent the lower bound, mean, and upper bound of the Gaussian, where the bounds are set three standard deviations away from the mean.

## Key features

- Create custom leagues
- Record match results
- View player leaderboards
- Flexible team and player sizes
- TrueSkill-based rating system
- Gaussian skill model display


## Frequently asked questions about Libra

### What is Libra?

Libra is an app designed to measure the skill of individuals within competitive environments by creating leagues and recording match results. It utilizes a flexible rating system based on TrueSkill.

### How does Libra display player ratings?

Libra displays player ratings using three numbers: the lower bound, mean, and upper bound of a Gaussian distribution. These bounds are set three standard deviations away from the mean, representing the player's skill.

### What types of games is the Libra rating system best suited for?

The Libra rating system is best suited for games where draws are not a primary outcome, players do not change teams mid-match, and there are no systematic advantages for certain teams.

### Can Libra handle different team sizes?

Yes, Libra is very flexible and supports any number of teams, as well as different numbers of players per team. It can also accommodate varying team and player sizes across different matches.

### Is Libra available on Android?

Based on the provided data, Libra is available on iPhone, iPad, and iPod. Information regarding Android availability is not specified.

### How often is Libra updated?

Libra was last updated on March 24, 2022, with version 1.0. Further update frequency details are not provided.

### What is the age rating for Libra?

Libra has an age rating of 4+, making it suitable for a wide range of users.

### Does Libra have ads?

No, Libra does not contain advertisements.

## Version history (last 1 release)

### 1.0 — 2022-03-24

No release notes.

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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 2026-07-05.*