Frequently Asked Questions｜GRAN EYE

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Frequently Asked Questions

Contents

About GRAN EYE
Installation
Judgment Accuracy
Operating Environment
About the GranDarts App
About Initial Settings

About GRAN EYE

What dartboards can I use?

GRAN EYE is compatible with 13-inch standard steel dartboards.

Supported dartboards

Any of the following common models from major manufacturers can be used without problems.

Winmau
Unicorn
BULL’S
Mission
TARGET
L-Style, etc.

Not supported / Caution required

Dartboards with the following special specifications may not be supported or may require manual calibration.

External wire type	Not embedded, wire is mounted on the surface	Not supported
Training dartboard	Sections other than single/double/treble/bull	Not supported
Wire is not silver	Special colors such as black	May require manual calibration
Different from standard color scheme	Different from standard color scheme	May require manual calibration

View calibration instructions

Can I use GRANBOARD (soft darts)?: No. The GRAN EYE is currently only compatible with steel darts. Currently, GRAN EYE is only compatible with steel darts. It will be available for GRANBOARD in a future update.

What do I need to install GRAN EYE?

In addition to the GRAN EYE itself, please prepare the following

Items Needed for Installation

13″ steel dartboard
Phillips screwdriver (No. 1)
Pen or pencil
major

Items Needed for Setup

Smartphone or Tablet*.
USB-C adapter with PD (Power Delivery) support
Wi-Fi router

Optional accessories sold separately

Optional accessories for GRAN EYE are also available.

GRAN EYE MagMount

MagMount is an optional accessory that allows GRAN EYE to be fixed to a dartboard magnetically.

Recommended for the following

For easier installation
Those who do not want to drill holes in the wall
For users of freestanding stands, tripod stands, and pole stands
For those who want to set up a simple installation at an event or outdoors.

View Details

What should I do after installing GRAN EYE?

Install the GranDarts application. You can start the initial setup from “Menu” -> “Device Settings” -> “GRAN EYE” in the lower right corner of the app top.

When playing games using GRAN EYE, turn on “Use GRAN EYE”.

Initial Setup Instructions

Which AI model should I use?: We recommend using the most accurate model available.
The available models can be confirmed in the AI test during the initial setup.

Installation

Are there any precautions I should check before installation?

Please check the installation method, wall material, and space available for installation.

Installation method

When Mounting on a Wall

GRAN EYE is usually mounted directly on the wall. Two cameras and one base unit are each screwed to the wall for installation. Please note that the dartboard and cameras must be mounted on a flat surface and at the same height.

Installation Instructions

When Mounting Without Drilling

The MagMount (sold separately) can be used for installation without making holes in the wall.

View Details

Wall Material

If the wall to be installed is plasterboard or concrete, use screw anchors appropriate for the wall material. Using appropriate anchors will ensure safe fixation.

Installation space

The following space is required for installation

Can it be used with ring lights for dartboards?

Yes, it can be used with commercially available ring lights.
However, please note that if the size of the light interferes with the camera’s field of view or installation position, it may not work properly.

Ring lights that have been confirmed to work

Mission Torus Series
Target Corona Vision

Can it be attached to a stand?: The MagMount (sold separately) can be used to mount the darts on a dart stand.

View Details

Do I need tools for installation?

A Phillips screwdriver (#1), measuring tape, and pen are all that is needed for installation. If you use MagMount, no tools are required for installation.

In addition, a PD (Power Delivery)-compliant USB-C adapter or a fast-charging battery is required to use GRAN EYE. (Sold separately)

Judgment Accuracy

What is the accuracy?

AI object detection accuracy is 99.3%; GRAN EYE’s decision accuracy depends on the type of AI model used. The detection accuracy of each model is as follows

Model	Detection accuracy (mAP50)
Light	98.9
Basic	99.1% (mAP50)
Pro	99.3% Pro

*”mAP50 (mean Average Precision)” is a general evaluation index that indicates the accuracy of object detection by AI.
*Actual scoring performance is also affected by your device performance and camera installation conditions.

What should I do if I feel that accuracy is low?

If you feel that accuracy is low, you may improve it by reviewing the following items.

calibration
AI model used
Adjusting the camera’s focus
Brightness of camera image
Specifications of dartboards and dart sets used

For more information, please see the following article.

When GRAN EYE Accuracy Is Low

Will accuracy be improved with updates?: Yes, we are constantly making updates to improve accuracy, and as AI technology evolves, GRAN EYE’s decision algorithm is also continuously improved.

Operating Environment

What operating software do you use?: Use the “GranDarts” application for smartphones and tablets, which can be installed from the App Store or Google Play Store.

What are the recommended devices?

GRAN EYE requires a smartphone or tablet with a certain level of processing performance in order to use AI to determine scores. However, even if your device is not the latest model, it can be used with no problem as long as it has general specifications.

Recommended

The Pro model allows for stress-free and comfortable play.

iOS

iPhone 12 (A14 Bionic)
iPhene 15 Pro (A17 Pro)

Andoroid

Xiaomi Pad 6s Pro
Xiaomi Pad 6s
Pixel 7a

Supported

Lite or Basic models can be used. May cause slight processing delays.

iOS

iPad 6th generation (A10 Fusion)

Andoroid

Redmi Pad SE

Not Supported

Use is not recommended due to slow judgment speed and uncomfortable play.

iOS

iPad Air 2nd generation (A8 X)

Andoroid

Pixel 4a
moto g53s 5G
Redmi Note 11 Pro 5G
Galaxy Tab A8

Can I use it with a web browser (PC)?: You cannot use the GranDarts app. Please use the GranDarts app on your smartphone or tablet.

Do I need an Internet connection?

An Internet connection is not required, but may be necessary depending on the intended use: to use GRAN EYE, the camera and the application must be connected to the same Wi-Fi router. However, this is a “network connection” and does not require an Internet connection (external communication).

Available Offline

Using the “offline mode,” local game play itself is possible without an Internet connection. However, since communication with the server is not possible, scores are not recorded and history is not saved.

Features Requiring Internet

Record and view play data
online competition
Obtaining updates, etc.

An Internet connection is required to use these features.

About the GranDarts App

Do you offer subscriptions?: No, there is no subscription. All features and services are currently available for free. Some games that will be added in the future may be available for a fee.

What types of game modes are available?: Local and online play is available. The game lineup for local play can be found at the following page.

Game Lineup

Can I register multiple players?: Yes, you can register up to 4 My Players (play data for Steel Darts) on one account. You can also register players from other accounts as guests.
For more information, please see the following article.

Add Guest / Instant Player

Can I play online?: Yes, online matches are free and open to everyone. Currently, only singles matches are supported, but with the update, doubles matches will also be available.

Can I play online against the electronic soft dartboard “GRANBOARD”?

Yes, cross play with GRANBOARD132 is available. *Cross-play compatibility with GRANBOARD3s and dash, which are 15-inch standards, is currently undecided.

*The service will be launched with the Ver. 2.0 update.

What languages are supported?: Japanese / English / German / French / Spanish / Italian / Simplified Chinese / Traditional Chinese / Korean

About Initial Settings

I cannot connect to GRAN EYE.: If you are unable to connect your device to GRAN EYE, please refer to the following article for possible solutions.

When Unable to Connect to GRAN EYE

I do not know my SSID.

SSID is the “Wi-Fi network name. The SSID is the name displayed when you select Wi-Fi on your smartphone or computer. It is different for each router in your home.

The method to check the SSID is as follows

Check the label on the router itself.
The “SSID” or “Network Name” is located on the label. In most cases, it is attached with a sticker on the side or bottom of the router.

Check with the device being connected.
- For iPhone / iPad
  Settings → Wi-Fi → Name of connected network
- For Android
  Settings → Network and Internet → Wi-Fi → Name of the currently connected network
- On a Windows PC
  Click the Wi-Fi icon in the lower right corner of the screen → Name of the network you are connected to
- On a Mac
  Click the Wi-Fi icon in the upper right corner of the screen → Name of the network you are connected to

If you are unsure, please consult your Internet provider or router manufacturer as well.