--- title: "Referee Tools — App Overview" url: https://marlvel.ai/intel-report/sports/referee-tools category: Sports developer: NAOYA ONO platforms: ios, android rating: 3.8 (155 ratings) pricing: free report_level: overview generated: 2026-04-24 last_verified: "2026-04-24T01:29:11.857Z" --- > **Key Insight:** This is a straightforward, free utility app that consolidates essential officiating tools into a single mobile interface. | Metric | Value | |--------|-------| | Category | Sports | | Rating | 3.8 ★ (155) | | Pricing | free | | Platforms | iOS, Android | | Latest Version (iOS) | 1.3.3 | | Latest Version (Android) | 1.3.2 | | Developer | NAOYA ONO | ## What is Referee Tools? Referee Tools is a utility application designed for sports officials to manage match timing and communication. It provides essential on-field tools including a configurable timer, digital whistle sounds, and a penalty card display system. ## Key Features - **Timer Function**: Supports both countdown and count-up modes with an optional audible alert at zero. - **Whistle**: Provides short, long, and double-blast whistle sounds, with a continuous play option for up to 30 seconds. - **Penalty Cards**: Displays yellow and red cards in full screen, with additional color options available in settings. ## Who is it for? Sports referees and officials across various sports such as soccer, rugby, and handball. ## Links - [App Store](https://apps.apple.com/us/app/referee-tools/id1624421256?uo=4) - [Google Play](https://play.google.com/store/apps/details?id=com.naoyaono.referee_tools&hl=en&gl=us) - [Full Intelligence Report](https://marlvel.ai/intel-report/sports/referee-tools) --- *This is an overview report. Sentiment analysis, competitive landscape, and SWOT analysis are available in the [full intelligence report](https://marlvel.ai/intel-report/sports/referee-tools).* *Generated by [Marlvel.ai](https://marlvel.ai) — Independent app intelligence.*