What is CeVIO AI? Features, Usage, and Commercial Use Explained

Aug. 7, 2026

What is CeVIO AI? Features, Usage, and Commercial Use Explained


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I want to know more about CeVIO AI!

CeVIO AI is a singing voice synthesis and speech synthesis software utilizing AI technology.

A major feature of CeVIO AI is its support for both singing voice synthesis and speech synthesis.

It enables reading aloud and singing by popular characters such as "Sato Sasara" and "Suzuki Tsudumi", making it suitable for music and video production.

This article

  • For those who want to try using CeVIO
  • For those looking for a text-to-speech method

will explain in detail the information necessary for those who want to start using it, from the features of CeVIO AI to specific usage, precautions for commercial use, and recommended text-to-speech methods.

Please use this article as a reference to find the perfect speech synthesis software or reading method for you.

[Free / Commercial Use OK] The Latest AI Text-to-Speech Service for Easy Use

Ondoku

For those looking for a service that can perform text-to-speech with the latest AI, we recommend "Ondoku".

"Ondoku" is a text-to-speech service that can be used for free.

You can read up to 1,000 characters for free without registration, and if you register your email address, you can read up to 5,000 characters for free!

Furthermore, even though it is free, commercial use is also OK (the free plan requires credit notation).

"Ondoku" can be used immediately without installation!

Since you can create audio immediately just by opening the top page, even beginners can use it with peace of mind.

It is available not only on Windows but also on Mac and Linux, which CeVIO does not support!

With voices covering a wide range of situations, from business to hobby use—including male, female, and children's voices—you can easily synthesize video narrations and in-store broadcasts.

Why not try creating easy-to-listen, realistic audio using the latest AI for free with "Ondoku"?

What is CeVIO AI? Explaining Professional-Grade Singing Voice and Speech Synthesis Software

First, we will explain the features of CeVIO AI.

CeVIO AI is speech synthesis software using AI technology

CeVIO

CeVIO AI is a speech synthesis software using AI technology developed by Techno-Speech, Inc.

It allows for high-quality speech synthesis with the voices of popular characters like Sato Sasara and Suzuki Tsudumi.

It is characterized by its ability to generate high-quality audio used in professional production sites, and it can be utilized for full-scale video and music production.

Since CeVIO AI is paid software, purchase is required for each character.

It is an ideal choice for those who want professional-grade speech synthesis software and are willing to cover the cost.

CeVIO AI supports both speech synthesis and singing voice synthesis

The greatest feature of CeVIO AI is that it supports both speech synthesis and singing voice synthesis.

Since you can produce both talk and music with a single software, you can weave conversations and songs into your videos without any sense of incongruity.

CeVIO AI enables natural vocalization close to humans through AI speech synthesis technology.

Unlike previous mechanical text-to-speech software, it can generate expressive audio unique to AI.

Because it is equipped with an emotional expression function, you can finely adjust various emotions.

Multiple emotional parameters are prepared for each character, allowing you to select the optimal emotional expression according to the content.

Differences between CeVIO Project products and Third-party products

CeVIO AI has two major product categories.

  • CeVIO Project products
  • Third-party products

CeVIO Project products are products developed and sold by the official CeVIO Project.

Voices of original CeVIO Project characters such as Sato Sasara, Suzuki Tsudumi, and Takahashi are available.

On the other hand, Third-party products are products developed by other companies using the CeVIO AI engine.

These also feature many characters widely used in YouTube videos, such as Koharu Rikka, KAFU, and Zundamon.

While both use the same CeVIO AI engine, the licensing systems and terms of use differ.

Purchase methods and support systems are also unique to each company, so caution is necessary when selecting a product.

Since the engine is common, there are no major differences in sound quality or basic functions, but there are differences in character personalities, voice qualities, and provided features.

Official Characters of CeVIO Project Products

Three official characters are available for CeVIO Project products.

Sato Sasara: The first female character of CeVIO

さとうささら

Sato Sasara is the first character of CeVIO.

She supports both Talk Voice and Song Voice, and is characterized by an emotionally expressive female voice.

With a bright and friendly voice quality, she can be applied to a wide range of content.

The CeVIO AI version was released in August 2021.

Suzuki Tsudumi: A female character with a calm voice

すずきつづみ

Suzuki Tsudumi is the second character of the CeVIO Project.

She supports both Talk Voice and Song Voice, and her charm lies in her calm female voice.

With a voice that pairs well with the bright voice of Sato Sasara, it is perfect for expressing a quiet and elegant atmosphere.

The CeVIO AI version was released in September 2022.

Takahashi: The only male character in CeVIO

タカハシ

Takahashi is the only male character in the CeVIO Project.

He supports Talk Voice only, and no Song function is provided.

Characterized by a calm male voice, it is a voice that can be utilized in a wide range of situations, from bright tones to business use.

The CeVIO AI version was released in August 2023.

An abundant lineup of Third-party products

There are also many diverse characters in third-party products for CeVIO.

Many highly popular characters in the speech synthesis world participate, such as Koharu Rikka, Tohoku Kiritan, Yuzuki Yukari, KAFU, and Zundamon.

小春六花

There are many collaboration characters with the anime and game industries, supported by a wide range of fans.

Due to the unique character settings of each development company, a variety of characters with different voice qualities and personalities are available.

You can select a character with performance more specialized for your application.

However, caution is necessary as prohibited matters such as commercial use may be set for each character.

Considerations when selecting a product

When selecting a CeVIO AI product, it is important to first clarify the application.

Options will be narrowed down depending on whether only the Talk function is needed or if the Song function is also required.

Voice preference is also an important factor, requiring consideration of male/female differences, age groups, and character personality.

Checking the terms of use and licensing system is also important, especially if commercial use is planned.

Since the terms of use differ greatly between CeVIO Project products and third-party products, it is recommended to check them in advance before purchasing.

Points to note regarding CeVIO licenses and terms of use

CeVIOのライセンス・利用規約の注意点

When using CeVIO AI, attention must be paid to the license whether for commercial or non-commercial use.

First, you should be careful about credits for the software name and character name.

In both commercial and non-commercial cases, it is necessary to state that you are using "CeVIO" and the name of the character on websites, videos, CD packages, title screens, etc.

Of course, you must also follow the terms of use for each character.

For CeVIO characters, you must use them without violating the CeVIO Character License; for third-party products, you must use them without violating the terms of use established for each character.

If you use both CeVIO Project characters and third-party product characters, make sure to check both licenses even if it is a hassle.

Registration of usage status may be required when using CeVIO AI

CeVIO AI allows commercial use when an individual uses it for certain purposes.

However, in the case of commercial use, it is necessary to register the usage status depending on the application.

Registration of usage status is not required for:

  • Use in video posting (channel monetization, affiliate advertising, Super Chats, tips, etc.)
  • Use on websites or blogs
  • Introduction of songs on radio programs
  • Use for guide vocals

These four types.

For other applications such as:

  • Media (DVD/CD) sales or download sales of music
  • Media (DVD/CD) sales or download sales of videos
  • Media (DVD/CD) sales or download sales of audio dramas or audiobooks
  • Use at club events or concerts
  • Media (DVD/CD) sales or download sales of apps/games
  • Use in classes

It is necessary to register the usage status on the official CeVIO website.

In addition, for other commercial use by individuals or use by corporations, it is necessary to request an individual estimate from the seller.

While CeVIO AI is software that can read aloud with realistic voices, because it is paid software with set characters, the licenses and terms of use are inevitably complex.

If you want to use it commercially, such as when you want to monetize video posts, it is recommended to check the terms of use in advance before purchasing.

How to Download & Install CeVIO AI [Windows 11]

Next, we will briefly explain how to purchase and install CeVIO AI.

Purchasing and downloading CeVIO Project products

CeVIO Project products can be purchased on various e-commerce sites.

Links to purchase sites such as Vector and Amazon are posted on the product information page of the official website.

There are download versions and package versions, but depending on the character, only a download version may be available.

Original CeVIO Project characters Sato Sasara, Suzuki Tsudumi, and Takahashi are download-only.

Difference between standalone Voice and Starter Packs

Regarding price ranges and how to choose, for first-time purchases, the "Talk Starter" and "Song Starter" packs are recommended.

Starter packs are products where the voice itself and the editor are bundled together.

In addition to starter packs, voices are also sold standalone.

If you already have the editor and want to add a second or subsequent voice, simply buying the standalone voice is fine.

CeVIO AI Installation Procedure

Next, we will explain the installation procedure for CeVIO AI.

Downloading CeVIO AI

First, in the menu of the official CeVIO website, click Download → CeVIO AI Production Version.

Download→CeVIO AI 製品版をクリック

Scrolling down on the CeVIO AI Production Version download page, there is a button for "CeVIO AI [Production Version] Download."

「CeVIO AI 【製品版】ダウンロード」のボタン

Click the button to download the installer.

CeVIO AI Installation Steps

Once the download is complete, double-click to launch the installer.

インストーラーを起動

Follow the instructions in the installer and click "Next" to proceed with the installation.

「次へ」をクリック

Read the license and agree if there are no problems.

規約に同意

Select the folder for installation.

Usually, you don't need to change it.

インストールするフォルダを選択

Preparation is now complete.

Press "Next" to start the installation.

インストールを開始

The installation will begin.

インストール中

Once the installation is finished, launch CeVIO AI from the desktop icon or start menu.

What to do when it won't launch

When launching CeVIO for the first time, it may not launch if files necessary for startup are missing.

For example, this time, "vc_redist.x64.exe" was missing and it could not be launched.

「vc_redist.x64.exe」が不足

If it won't launch, open the Microsoft download page from the error message.

If it doesn't open well, search for "vc_redist.x64.exe" in your browser.

「vc_redist.x64.exe」で検索

Then, you will find the official Microsoft website where you can download "vc_redist.x64.exe".

「vc_redist.x64.exe」をダウンロード

After downloading the file, agree to the license terms and conditions and install it.

「vc_redist.x64.exe」をインストール

Now you can launch CeVIO AI.

Launch by entering the serial number

Upon the first launch, it is necessary to enter the serial number.

初回起動時にはシリアルナンバーを入力する必要

The serial number is included with the purchased product.

Note that you cannot use CeVIO if you do not have a serial number.

You must purchase the product package.

Free trial version available for CeVIO Creative Studio 7 (CS7)

CeVIO AI is paid software, and there is no trial version available for free.

Instead, a trial version of the previous version, CeVIO Creative Studio 7 (CS7), is released on the official website.

CeVIO Creative Studio 7(CS7)の体験版

The trial version of CeVIO CS7 includes Talk Voices for Sato Sasara, Suzuki Tsudumi, and Takahashi, and the Song Voice for Sato Sasara.

The installation method for the CeVIO CS7 trial version is almost the same as that for CeVIO AI.

CeVIO CS7の体験版のインストール方法はCeVIO AIのインストール方法とほとんど同じ

You can use the trial version by selecting "Start Trial Version" when launching and entering your email address.

「体験版を開始する」を選択

The trial version can be used for 30 days.

体験版は30日間使用可能

Once launched, you can edit Talk and Songs just like in the production version.

トークやソングを編集可能

However, since you cannot export the audio, it cannot be used for purposes such as video narration.

Since CeVIO is paid speech synthesis software, it cannot be used for free.

If you want to use AI speech synthesis software for free, it is recommended to use other speech synthesis software such as "Ondoku".

[Free] How to Choose Recommended Speech Synthesis Software for Easy Use

【無料】手軽に使えるおすすめ音声合成ソフトの選び方

CeVIO AI is a recommended choice for text-to-speech.

However, as it is paid speech synthesis software, it has the disadvantage of having a high barrier to entry for those using text-to-speech software for the first time.

Many people might feel reluctant to suddenly use paid software at a stage where they don't know if their YouTube channel can be monetized.

That is why we recommend using a text-to-speech service that can be used for free.

By using the AI reading service "Ondoku", you can create AI reading voices for free.

Free speech synthesis services are also recommended for video creation!

For those making a video for the first time using speech synthesis software, we recommend using a free AI speech synthesis service.

In fact, speech synthesis software is not limited to paid software like CeVIO.

With the advancement of AI technology, free services with performance as high as paid software like CeVIO have appeared!

The most recommended one is "Ondoku".

Ondoku

"Ondoku" is a text-to-speech service that can be used for free.

Because it adopts the latest speech synthesis AI, it can synthesize audio with realism equal to or greater than paid software!

Another feature is the ability to read aloud with richly varied voices including female, male, and children.

文章読み上げソフトOndokuの声16種類を無料で試し聞き。高低変化で印象チェンジ

Listen to 16 types of Ondoku text-to-speech software voices for free. Change impressions with pitch changes.

Ondoku has 16 types of Japanese voices. Of course, both male and female voices are available. We have made it possible to listen to 8 commonly used Japanese voices and how they sound when the pitch of each voice is adjusted.

Advantages of text-to-speech services that require no installation

CeVIO AI is paid software that requires installation.

Therefore, purchase, download, and installation are necessary.

On the other hand, "Ondoku" can be used immediately just by accessing it through a browser.

The charm is the ease of being able to use it as soon as you think of it!

Free reading services also allow for foreign language speech synthesis

CeVIO AI is software specialized for speech synthesis centered on Japanese.

Some products support English lyrics, but Talk Voices are made on the premise of reading Japanese.

While it demonstrates excellent performance regarding high-quality speech synthesis in Japanese, it is not good at reading foreign languages.

Therefore, we recommend the free reading service "Ondoku".

"Ondoku" supports over 80 languages and dialects, making it suitable for global content production.

By adding foreign language narration to videos for YouTube, you can get more users to subscribe!

【Ondoku】対応言語の声の種類とサンプル音声を試聴

[Ondoku] Listen to voice types and sample audio for supported languages

Here we introduce the supported languages and sample voices of Ondoku.

[Free] Commercial use and monetization are also OK with "Ondoku"!

In CeVIO AI, detailed terms of use are set for each character.

When performing commercial use, it is necessary to individually check the conditions of use for each character.

In contrast, the terms of use for "Ondoku" are very simple.

Even when using it for free, commercial use is OK if you provide credit notation.

If you subscribe to a paid plan, you can use it without credit notation.

Ondokuでできること。商用利用(業務利用)や禁止事項について。

What you can do with Ondoku. Regarding commercial use (business use) and prohibited matters.

Commercial use (business use) is possible with Ondoku. Use for the purpose of obtaining direct or indirect profits, such as money, regardless of whether it is an individual or a corporation, is commercial use. However, please note that prohibited acts are established in Ondoku. This time, we explain what you can and cannot do with Ondoku...

When you want to use it commercially, such as for use by companies/corporations or for YouTube monetization, "Ondoku" is ideal.

Why not try the AI text-to-speech software "Ondoku" for free?

As described above, "Ondoku" is recommended for your first speech synthesis!

Since it can be used commercially for free, it is perfect for YouTube monetization.

If you are wondering what kind of speech synthesis software to use, why not experience "Ondoku" for free first?

■ AI voice synthesis software "Ondoku"

"Ondoku" is an online text-to-speech tool that can be used with no initial costs.

  • Supports approximately 50 languages, including Japanese, English, Chinese, Korean, Spanish, French, and German
  • Available from both PC and smartphone
  • Suitable for business, education, entertainment, etc.
  • No installation required, can be used immediately from your browser
  • Supports reading from images

To use it, simply enter text or upload a file on the site. A natural-sounding audio file will be generated within seconds. You can use voice synthesis up to 5,000 characters for free, so please give it a try.

Text-to-speech software "Ondoku" can read out 5000 characters every month with AI voice for free. You can easily download MP3s and commercial use is also possible. If you sign up for free, you can convert up to 5,000 characters per month for free from text to speech. Try Ondoku now.
HP: ondoku3.com
Email: ondoku3.com@gmail.com
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