Seeing with the fingers

Augmenting the Braille

for Education
Inclusion and Accessibility

(On this page a photo shows a hand wearing Keynoa Rings and touching the screen of a smartphone on which is displayed a text in Braille characters)

Keynoa Plateform

Keynoa is an assistive technologies platform offering solutions specifically developed for blind and visually impaired people supporting their education and enhancing their inclusion and accessibility. Keynoa tools include a hand wearable device Keynoa Rings and a mobile application Keynoa App allowing, in particular, to easily read and write digital text in any language and, more widely, to “see with the fingers”.

Based on the Cherradi methodthe characters of the digital text to read are converted to coded vibrations produced by the finger rings of the Keynoa Rings wearable device. The easy to learn coded vibrations on the fingers are interpreted by the user as characters of the text they constitue. Also with Keynoa Rings, the user produces characters, symbols, and commands, without a keyboard or equivalent, simply by making finger taps on a hard surface, based on the Cherradi method.

Keynoa introduces Keynoa Braille constituting a set of innovative and user-friendly aids augmenting and simplifying the Braille system. Braille readers read Braille characters easily with vibrations and write them simply with finger taps.

For the first time, musicians used to read Braille music notes, can now read music notes with vibrations on the fingers while playing their instrument.

Keynoa offers effective means for blind children to be integrated into sighted children’s classrooms making them feel less excluded and benefiting from equal rights and opportunities.

Keynoa Rings hand wearable is particularly useful for deaf-blind people as it enables easy and comfortable communication with other people as well as with other devices, leaving the fingers simultaneously free for other activities. 

Keynoa simplifies access to information and communication and allows reading and sending text messages privately and silently. Since their hearing sense is free while using Keynoa, the users continue to participate in the discussions and listen to the surrounding sounds, they are therefore less excluded in their social life.

Keynoa gives instant access to any book or document in digital form in any language. The user selects a digital book or document and sits back reading it and navigating it while drinking a coffee as with Keynoa Rings the reading information flows simply and naturally to the fingers.

Keynoa Method

Based on the Cherradi method, Keynoa associates fingers to characters, symbols or commands; the user reads a character simply by receiving gentle vibrations on two corresponding fingers and also writes that character simply by producing taps naturally with those two same fingers. 

Cherradi method associates two fingers to each latin letter. To write or read latin alphabet are used: 

  • for letter a, the little finger followed again by the little finger  
  • for letter b, the little finger followed by the ring finger  
  • for c, the little finger followed by the middle finger etc., then
  • for f, the ring finger then the little finger etc., 

(Following is a graphics image illustrating 26 pictograms. Each pictogram shows the 2 hands where the fingers associated to each of the 26 latin letters are marked with red dots.)

For producing the alphabet characters, a pictogram indicating with red dots, the combinations of fingers from one hand that when tapped simultaneously produce the character in question

For more information about Keynoa Method please click here

Seeing with the fingers

Keynoa converts to finger vibrations not only text but also other digital information like distance to objects, colors, graphical images, such as maps or other educational graphics, etc. With this unique approach, Keynoa introduces a novel concept allowing users to “see with their fingers.”

Using Keynoa Rings wearable the user senses, via vibrations on the fingers, the pixel colors of the points touched on the mobile phone screen. 

With Keynoa Distance Sensor the user feels objects in the vicinity and evaluates their distance before touching them simply by receiving vibrations of the fingers.

With Keynoa, blind students explore the content elements of graphical images, such as geographical maps, mathematical graphs, atoms’ structures, chemistry molecules, or other educational graphics. These education and information graphic images are called Keynoa Interactive Graphics Images (KIGIs).

(Following is a photo showing a hand wearing Keynoa Rings and touching the screen of a smartphone to learn the contents elements of a Keynoa  Interactive Graphics Image illustrating the atom of Hydrogen and the atom of Helium)

For more information about the KIGIs please click here

Keynoa Braille

Keynoa introduces Keynoa Braille, a set of innovative and user-friendly aids augmenting and simplifying the Braille methods for reading and writing. Keynoa Braille makes use of Keynoa‘s haptic interactive techniques to enable users to read and write Braille characters through vibrations and finger taps. 

Keynoa Braille offers the following features:

  1. Reading Braille characters by receiving vibrations on those fingers traditionally used to print Braille characters using Braille keyboards, i.e. the index, the major, and the ring fingers. In other words, Keynoa introduces Keynoa Braille Fingers Mapping of Braille characters by associating characters to combinations of vibrations on the fingers that are traditionally used on the Braille keyboards, namely the index, the major, and the ring.
  2. Similarly, writing Braille characters by producing taps with the fingers that are traditionally used on the Braille keyboards. Here, Keynoa also uses the same Keynoa Braille Fingers Mapping as above by converting to characters combinations of finger taps produced by the Braille keyboard fingers: the index, the major, and the ring.
  3. Reading Braille characters on the screen of a smartphone or tablet by sensing the Braille characters dots on the device screen. When touching a Braille cell dot on the screen, the users feel coded vibrations on the fingers (or on the device), allowing them to read the associated Braille character.

These developments not only broadens and supports the scope of utilisation of the Braille system but also caters to promoting and encouraging the reading and writing habits essential to acquiring a good command of languages, spelling, and grammar, particularly when vocal assistance applications are becoming more widely used. Consequently, Keynoa strives to enhance access to education, information and culture and promotes inclusivity and equality for individuals with visual impairments.

For more information about Keynoa Braille please click here.

Keynoa Braille Music

Braille music is a music notation method based on Braille characters where music notes are represented by Braille cells enabling visually impaired musicians to read music. Traditionally musicians read Braille music notations, learn them by heart, then they play them on their instruments.

Keynoa Braille Music offers blind and visually impaired musicians, capable to read Braille music notations, the possibility to read music sheets and play their instrument at the same time. Users select their music sheets notes in the form of digital Braille text, using Keynoa Braille they read the notes by vibrations on their fingers based on Keynoa Braille Finger Mapping while they are playing them on their instrument. 

Keynoa self-learning mode

Keynoa offers a self-learning functionality consisting of characters learning windows and a colours learning windows, it allows the user to learn independently:

  • Keynoa Fingers Mapping based on the Cherradi method,
  • Keynoa Braille Fingers Mapping based on the Cherradi method,
  • Large palette of colors.

In the characters learning window the users learn Keynoa Fingers Mapping, i.e. which fingers are associated with the letters, numbers and frequently used symbols.

In the Braille learning window the users learn Keynoa Braille Fingers Mapping, i.e. which fingers are associated with the Braille letters, numbers and frequently used symbols.

In the colours learning window, the users learn which fingers are used for sensing the colours of the pixels touched on the smartphone screen.


(Following is a graphics image used in self-learning mode; it is showing 45 grey buttons representing latin alphabet, numerical digits and frequently used symbols)

(Following is a graphics image used in self-learning mode; it is showing 62 grey button representing Braille english alphabet, numerical digits and frequently used symbols)

(Following is a graphics image used in self-learning mode; it is showing 46 grey buttons representing cyrilic alphabet, numerical digits and frequently used symbols)

(Following is a graphics image used in self-learning mode; it is showing 135 button representing different colors)

Get Keynoa App for Android devices on Play Store

Keynoa does not transmit nor collect anything the user types nor any personal information.

Getting started with Keynoa App

Quick tutorial

For writing with Keynoa using the mobile device screen (phone or tablet), Keynoa invites you first to set the reference positions of your fingers by asking you to “Tap with 5 Fingers Simultaneously” on the screen of the smartphone or “Tap with 10 Fingers Simultaneously” on the screen of the tablet . Do it in a comfortable and relaxed manner make sure all fingers are inside the mobile screen. You can then write text characters and symbols by producing taps with bare fingers on the screen following the Cherradi method.

Keynoa Rings is a comfortable hand wearable with five rings placed on each finger and a controller placed on the back of the hand. Using Keynoa App, the user connects Keynoa Rings to the phone via Bluetooth wireless connection. The user selects the text to read, then the fingers receive successively the vibrations corresponding to each character or symbol of the text. The user can sit back with the fingers immobile or do something else with the fingers while reading the text via fingers vibrations produced by Keynoa Rings. 

The user can also write text characters and symbols using Keynoa Rings by producing finger taps on any hard surface following the Cherradi method.

Granting access to Keynoa App

For Keynoa App to run properly, the user needs to allow it to access on the used device the following functions:

  • Connect via Bluetooth to Keynoa Rings,
  • Have access to text content of other applications running on your phone,
  • Have access to pixel colors of the screen of your phone ,

This does not mean that the Keynoa will collect sensitive personal information at all; as stated in its Privacy Policy, Keynoa does not transmit nor collect anything the user types nor any personal information.

Keynoa Privacy Policy

Your privacy is of great concern to Keynoa Technologies  team.

Collection of Personal Information

Keynoa DOES NOT COLLECT ANY PERSONAL INFORMATION OR ANY INFORMATION THAT YOU TYPE using this app. When you allow full access for Keynoa, you may be warned that the  can be used to “transmit anything you type, including things you have previously typed with this keyboard.” This is the standard warning message for all third-party input methods, however, Keynoa does not collect any personal information or transmit such information to a server or third party.

Disclosure of Personal Information

As Keynoa does not collect any personal information, your personal information is safe will not be disclosed to any third party.

Data Storage

Keynoa data (settings parameters) are stored on your device locally and do not contain any personal information.

Allow Full Access

Keynoa needs you to turn “Allow full access” on in order for it to appear on the screen. Keynoa will only display the text you write and no text or personal information will be stored.

 Policy Changes

Any changes to this policy will be posted to an update of the App. You are advised to regularly view our most recent privacy policy

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