To increase the population of guitar players

Uniken co.,ltd.


Breakthrough tool

It’s for people without any previous experience on any musical instruments.
We believe that anyone can play the guitar because of Qactus.


To increase music lovers

Q-sai@ has been trying to increase the number of music lovers so long time. The inventor's website will help you to know the reason.
hiroki kiribayashi's official website


How to get Qactus

You can directly order Qactus on this website if you are in Japan.
However you have another way to get wherever you are.


Qactus is on "QactusCore"

It is mandatory to access the website "http://qastus.jp" because Qactus depends mainly on the material called "QactusCore" which can only be found in this website.


anyone can play GUITAR

Qactus has three ways in helping beginners out

Qactus helps you know the condition of your guitar.

The physical condition of guitars may change depending on how the user uses or stores it. These changes may affect the performance of the guitar when played. Sometimes, the guitar no longer remains a musical instrument. read more


Qactus minimizes the difficulties you might encounter as a beginner.

Being a beginner might be difficult stage to some. You might encounter mistakes or frustrations that may make you want to stop trying do something new. A musical instrument, for one, may seem very difficult to learn. read more

Qactus fosters harmony and friendship between differences.

Aside from helping you improve your skill, Qactus will also allow you to meet new people. Through QactusCore and QactusCore-Method, beginner, experts and professional guitar players can meet online to help each other out.



There are three ways for beginners to prepare for "the next stage"

Qactus has three ways for beginners from transitioning with the use Qactus to performing without it.

【Qactus】There are three ways for beginners to prepare for the next stage

To get the ability to hold the strings securely by graduation from Qactus

The acoustic guitar has six, hard metal strings with a total of 50 to 70kg of tension. You won't be able to hit the target pitch or sound if you don't put the required force efficiently on the strings. Beginners who cannot hit the target sound with only 1 or 2 fingers will feel frustration using 4 or 5 fingers. Many beginners definitely gave up when they were at the next stage using 4 to 5 fingers freely. When using Qactus, it is normal to feel tension (hardness) on the strings. You will learn the correct feel of the required force on the strings unconsciously. It is similar to baseball bat training wherein the training bat is heavier than the usual bat. By getting accustomed to the hard tension of the strings with Qactus, it makes it easier for beginners to transition to the next stage.


At the next stage, beginners will realize the correct chords and will pursue graduating from the use of Qactus

When using Qactus, often there is a sound that produces dissonance. This was analyzed by the Instrument “Q-sai music Camp” that there are various setbacks and tendencies saying frustrated people which are 80% of beginners focus on. 80% of beginners, even if they study alone, can continue without frustration. They will be able to grasp the string with their fingers naturally. It is a training method especially for people in the "technical state" in which the pitch can cause dissonance. By doing this, it reduces the workload which can become burdensome. It is a unique method. Trust us on this. On the contrary, some people do not notice the finger movement with Qactus. They improve while using it and at the same time the beginner's playing ears are also cultivated. Sometimes, risky notes come out while playing with Qactus but it will help certain beginners. It will be time for one to graduate from Qactus when a beginner is conscious with dissonance. From here on, it is the second stage which is the period for one to further improve with their own power without using Qactus. Although the burden of "being technical" increases naturally becasue there is no help from since the risky notes drifting up to that time are cleared out, You can enjoy the pleasure and surprise the progress of your own eyes, You can overcome the new wall.

Developer's aim to "transition all beginners to the next stage"

Qactus is a tool designed for beginners who want to give up. It's not about toughness because it should first be thought of as tool for all beginners to be able to transit to the next stage of playing a guitar. Qactus is made of polycarbonate among other plastic materials. A great feature of this material is that the tone of the guitar gets brighter. For beginners, you have a choice of enjoying to play the guitar for as long a time as you want but it is not "a choice that can rely on Qactus for as long as possible". If you get tired of using Qactus in spite of you using it properly, please recognize it as a "Go sign" or signal that you're ready for the next stage. Believe in your skill and graduate from Qactus.




Qactus works properly whenever you are on [QactusCore].


[QactusCore] is a bank of the easiest chord diagrams designed for all Qactus users.

So many songs in the world will become easy to learn as long as you have [Qactus] + [QactusCore].

Many people without any previous experience on any musical instruments will know about the important value of music and the difficulty to play guitar at the same time through the ideas.



[QactusCore-Method] is for all music lovers

Music lovers will help eachother with QactusCore.


QactusCore is a platform to help eachother between music lovers. The specific knowledge which will make it is [QactusCore-Method].

It will be able to help many beginners when you've mastered to play guitar. Your music skills will improve through trying to contribute your arrangements.