[2026 Latest] 10 Recommended AI Speech Synthesis Software! Thorough Comparison from Free to Paid

AI voice synthesis software that converts text into natural speech is currently attracting a lot of attention!

With the advancement of AI technology, the quality of voice synthesis software has improved dramatically.

It can generate human-like natural voices with high quality that is incomparable to the mechanical reading of the past.

Moreover, even with free voice synthesis software, you can perform voice synthesis with pro-level high quality.

The use cases for voice synthesis software are expanding rapidly, including narration for video production, creating language learning materials, and business presentation materials.

In this article, we carefully select and introduce the latest recommended voice synthesis software for 2026!

We will explain the features and usage of each in detail, from free software to paid software, so why not find the perfect voice synthesis software for you?

[Free] Recommended AI Voice Synthesis Software You Can Use Right Now

If you are looking for voice synthesis software, Ondoku is recommended!

Ondoku is a voice synthesis software using the latest AI technology that can be used for free from your browser.

Its feature is that you can easily synthesize high-quality voice right now, without installation, on any environment such as PC, iPhone/iPad (iOS), or Android smartphones.

Despite being free, it can read up to 5,000 characters, and commercial use is also OK!

It supports multiple languages including not only Japanese but also English, Korean, and Chinese, so you can easily create audio in foreign languages.

If you are unsure which voice synthesis software to choose, why not try Ondoku for free first?

What is Voice Synthesis Software? Basic Knowledge Explained for Beginners

First, we will briefly explain voice synthesis software.

What are the features of voice synthesis software evolved through AI technology?

Voice synthesis software refers to software that automatically vocalizes entered text.

Actually, it is a software that is gaining more and more attention and an increasing number of users.

Previous voice synthesis software had mechanical utterances with a strong sense of unnaturalness.

But now, with the latest AI technology, it has become possible to use natural intonation and pauses like a human.

Especially with voice synthesis software utilizing deep learning, realistic and easy-to-hear expressions like those of professional voice actors or narrators have become possible.

Detailed customization, such as adjusting the reading speed and changing the pitch, is also possible.

Types of Voice Synthesis Software [AI Web Apps are Recommended!]

There are two main types of voice synthesis software.

Web app-type voice synthesis software used from a browser, and desktop-type voice synthesis software installed on a computer.

The appeal of web app-type voice synthesis software used from a browser is that it can be started immediately without installation.

With the AI web app Ondoku, you can utilize the latest AI technology regardless of your PC's performance.

Installed-type voice synthesis software has the advantage of being usable even in offline environments.

Which voice synthesis software to choose should be decided based on your usage environment and purpose.

[Free Options Included] 10 Recommended Voice Synthesis Software for 2026

Now, let's introduce the latest recommended voice synthesis software for 2026 in detail!

1. Ondoku
2. VOICEVOX
3. Bouyomi-chan
4. SofTalk
5. COEIROINK
6. Textalk
7. Yukumo!
8. A.I.VOICE
9. CeVIO
10. VOICEPEAK

1. Ondoku | Free voice synthesis software that can read aloud with the latest AI

Ondoku is a high-quality voice synthesis software that adopts the latest AI technology.

If you are looking for voice synthesis software, this is the first choice you should try!

It is a web app-type software that can be used from a browser, so no tedious installation work is required at all.

Just enter text and press a button, and you can synthesize a natural audio file in just a few seconds.

Japanese voices can be selected from more than 16 options, offering a wide variety such as female voices, male voices, and children's voices.

Since it supports multiple languages, synthesizing audio in foreign languages such as English, Chinese, and Korean is also easy.

The reading speed and pitch can also be freely adjusted, so you can create the most suitable audio according to your purpose.

Since commercial use is also OK, it is ideal for YouTube monetization and business use (Click here for details on commercial use).

And Ondoku is free!

It can be used without registration or login, so we recommend actually trying voice synthesis with the latest AI first.

Why don't you also try using Ondoku for free first?

2. VOICEVOX | Voice synthesis software that can use popular characters like Zundamon

VOICEVOX is a desktop-type voice synthesis software compatible with Windows, Mac, and Linux.

Its greatest feature is that it can read aloud using popular character voices such as "Zundamon," "Shikoku Metan," and "Kasukabe Tsumugi."

It uses deep learning technology, allowing for detailed adjustments of the audio.

The software itself is free and commercial use is possible, but caution is needed as terms of use differ for each character.

A GPU-compatible version is also provided, enabling faster processing on high-performance PCs.

3. Bouyomi-chan | Voice synthesis software supporting Yukkuri Voice for streaming

Bouyomi-chan is a voice synthesis software widely used in game streaming and live broadcasting.

It can perform voice synthesis with the characteristic voice known as "Yukkuri Voice."

It has extensive integration features with streaming software such as OBS, making it ideal for reading aloud comments on YouTube and Twitch.

It is also a standard tool used in "Yukkuri Jikkyo" (Let's Plays) and "Yukkuri Kaisetsu" (Explanations) on Niconico Douga and YouTube.

It is a lightweight free software for Windows that runs comfortably even on low-spec PCs.

Since it uses an older version of AquesTalk, commercial use is possible even for free.

While the sound quality is mechanical, its unique personality makes it a voice synthesis software loved by many creators.

4. SofTalk | Simple voice synthesis software with a long history

SofTalk is a simple free voice synthesis software for Windows.

With a simple interface specialized for basic functions, it is easy for beginners to use.

Multiple voice synthesis engines can be selected, allowing you to choose the voice according to your purpose.

*It used to support "Yukkuri Voice," but it is currently unsupported.

The software itself is free, but when using it for commercial purposes, checking the terms of the voice engine being used is necessary.

It is an ideal free software for those seeking basic voice synthesis functionality.

5. COEIROINK | AI voice synthesis software for creative activities

COEIROINK is an AI voice synthesis software developed for creative activities.

It is a desktop type compatible with Windows, Mac, and Linux, and can read aloud with various character voices.

In addition to official and recognized characters, user-created voice models called "MYCOE" can also be used.

Commercial use is possible, but credit notation is mandatory.

Also, since terms of use differ for each voice model, checking before use is important.

It is a voice synthesis software suitable for those seeking unique voices for creative purposes.

6. Textalk | Lightweight voice synthesis software for Windows

Textalk is a lightweight and simple free voice synthesis software for Windows.

It uses OpenJTalk and the standard Windows voice synthesis engine.

While there are limits to the naturalness of the voice compared to the latest AI, it has sufficient performance for basic reading.

It is a software that can be used just by extracting the ZIP file, and it runs comfortably even on old PCs or low-spec environments.

7. Yukumo! | Voice synthesis software that allows using Yukkuri Voice from a browser

Yukumo! is a web app-type voice synthesis software that allows using "Yukkuri Voice" from a browser.

No installation is required, and it can be used from any device.

It supports multiple versions such as AquesTalk1, AquesTalk2, and AquesTalk10.

It is a voice synthesis software recommended for those who want to start "Yukkuri Kaisetsu" or "Yukkuri Jikkyo" without installation.

8. A.I.VOICE | Paid voice synthesis software supporting popular VOICEROID characters

A.I.VOICE is a high-quality paid voice synthesis software developed by AI Inc.

It is the successor product to VOICEROID, and currently A.I.VOICE2 is being rolled out.

Its greatest feature is the lineup of popular character voices such as "Yuzuki Yukari" and "Kotonoha Akane/Aoi."

Compatible with both Windows and Mac, it is sold as a one-time purchase paid voice synthesis software.

Commercial use by individuals is basically possible with product purchase, but corporate use requires a separate license.

It is a voice synthesis software ideal for creative audio work production and high-quality narration creation.

9. CeVIO | Expressive paid voice synthesis software that can use popular characters

CeVIO is a voice synthesis software that combines reading and singing functions.

It is sold as a one-time purchase paid voice synthesis software exclusive to Windows.

It is characterized by being able to use popular, personality-rich character voices such as "Sato Sasara" and "Suzuki Tsudumi."

With its unique voice synthesis AI, it can read text with rich emotion.

In addition to "Talk Voice" for reading, "Song Voice" for singing is also available, supporting both reading and singing.

Commercial use conditions for individual creators are relatively lenient, but corporate use requires a separate license.

It is a voice synthesis software recommended for those who want to create audio content with rich expressiveness.

10. VOICEPEAK | Paid voice synthesis software that can use a wide variety of characters

VOICEPEAK is one of the few desktop-type voice synthesis software programs that supports Windows, Mac, and also Linux.

It also allows for voice synthesis with various popular characters.

A feature is that there are packages that include multiple character voices, offering a rich lineup of not only female but also male voices.

The basic license includes commercial use rights, but separate terms apply to character voices.

It is ideal for narration production and voice synthesis across multiple platforms.

[Free] How to use voice synthesis software? Detailed explanation of how to use Ondoku

From here, we will explain how to actually use voice synthesis software, using Ondoku as an example!

[Free] Flow of reading text with the voice synthesis software Ondoku

If you are going to use voice synthesis software from now on, web app-type voice synthesis software that can be easily used without installation is recommended!

To read text with Ondoku, first access the official website.

When you open the top page, there is a text box, so enter the content you want to read.

(Copy-pasting is also OK)

Next, select the type of voice.

You can listen to the voices available on Ondoku in this article, so please take a look!

After that, just click or tap the "Read aloud" button!

High-quality audio will be completed in just a few seconds.

The audio files can be downloaded in MP3 format, so you can use them for various purposes such as video narration or in-store broadcasting.

As you can see, the free voice synthesis software Ondoku is very easy to use.

If you are looking for voice synthesis software, why not try Ondoku first?

Ondoku also allows adjusting reading speed and pitch

The voice synthesis software Ondoku also supports adjusting reading speed and pitch!

Adjusting the reading speed is effective depending on the importance of the content.

When using it for language study, it is also recommended to daringly lower the speed significantly.

When using it for video narration, adjusting the voice pitch is also recommended.

By changing the pitch, you can create character traits tailored to the listener.

What are the Merits and Demerits of AI Voice Synthesis Software?

When using voice synthesis software, it is also recommended to fully understand the merits and demerits.

We will briefly explain the merits and demerits of AI voice synthesis software.

What are the merits of AI voice synthesis software?

The greatest merit of voice synthesis software is cost reduction.

When requesting a professional narrator, many costs such as recording fees, studio fees, and transportation costs are incurred, right?

But if you choose voice synthesis software that can be used for commercial purposes for free, you can significantly save on these costs.

Shortening the time required for audio creation is also one of the major merits.

Until now, trying to create video narration or in-store broadcasting required a lot of time for recording reservations, re-recordings, and editing work.

But with voice synthesis software, audio is completed in just a few seconds just by entering text.

High-quality audio can be created for free anytime

The high quality of the audio is also a merit of AI voice synthesis software.

When a human reads aloud, quality variation can occur depending on physical condition or mood.

Also, recording by yourself without asking a pro may result in very hard-to-hear audio...

On that point, with voice synthesis software, you can generate audio of the same quality anytime.

There is no worry about audio quality deteriorating due to recording equipment or the surrounding environment.

Being available 24/7 is another unique advantage of voice synthesis software.

Even in the middle of the night or early morning, you can create audio as soon as you think of it.

With multi-language-compatible voice synthesis software, you can also easily create narrations in foreign languages.

Demerits of AI voice synthesis software

There are also some demerits to voice synthesis software.

Depending on the software, there may be limits to emotional expression.

If you are dissatisfied with the expression, it is also recommended to try using voice synthesis software that uses the latest AI for free.

Caution is also needed for commercial use.

Since some paid software has restrictions on commercial use, let's check the terms of use beforehand.

When you want to use it for video monetization or business, software that can be used for commercial purposes for free, starting with Ondoku, is ideal.

[Free is OK] How to further utilize voice synthesis software? Explanation of usage by purpose

Finally, we will explain how to utilize voice synthesis software in detail by purpose!

Voice synthesis software is ideal for video production and YouTube narration!

If you want to add narration in video production, voice synthesis software is ideal.

When using voice synthesis software in video production, it is important to use one that can read aloud with a natural voice that doesn't feel out of place.

Choosing a voice synthesis software capable of commercial use, compatible with monetization on platforms like YouTube, is also key.

With Ondoku's high-performance AI voice synthesis engine, you can create easy-to-hear audio like that of a professional narrator.

What's important in video production is adjusting the reading speed according to the content.

Setting important parts slightly slower is effective.

Create language learning materials for free with voice synthesis software

Free voice synthesis software is also recommended for pronunciation practice when learning languages.

By using Ondoku, which supports multiple languages, you can accurately study the pronunciation of various languages.

Creating materials for shadowing, which is effective for language learning, is also easy if you have voice synthesis software.

It is also recommended for strengthening listening skills in foreign languages.

The key when making language learning materials is to make the playback speed slow at first.

Since Ondoku can lower the playback speed down to 0.3x, it is ideal for those who have just started studying foreign languages.

Utilize voice synthesis software in business as well

Of course, voice synthesis software can also be utilized for corporate business purposes.

• Vocalizing presentation materials
• Adding audio to internal training materials
• Guidance voice for call centers
• Announcements within facilities

Voice synthesis software can be used for a wide range of purposes.

If you use voice synthesis software capable of reading aloud in foreign languages, you can also easily create announcements for inbound tourists in English, Korean, Chinese, etc.

For companies that prioritize security, Ondoku, a service originating in Japan, is reassuring.

Even when using it for business, let's be careful to use voice synthesis software that supports commercial use.

Game Streaming and Live Broadcasting

When using voice synthesis software in live broadcasting, real-time reading is important.

By integrating voice synthesis software specialized for streaming like Bouyomi-chan with OBS, you can check comments without taking your eyes off the screen.

By utilizing the comment reading function for viewers, it is also possible to further enliven the streaming content.

Improving Accessibility

Voice synthesis software is also a very important tool for visually impaired people and those with learning disabilities.

By vocalizing website text, more people will be able to access digital information.

By introducing voice synthesis software, usability can be improved not only for people with disabilities but also in services for the elderly.

What's important when making audio that is easy for anyone to hear is to use AI voice synthesis software with a natural voice.

With high-quality AI voice synthesis software with realistic voices, you can create audio that is less tiring even when listened to for a long time.

For accessibility compliance for corporate or organizational websites, or creating guidance broadcasts for public facilities, the latest AI voice synthesis software is recommended.

Why not try using the best voice synthesis software for you?

With the advancement of AI technology, anyone can now easily create high-quality audio with voice synthesis software.

Even with free software, pro-level voice synthesis is possible.

What's important is to choose the optimal voice synthesis software according to your purpose, such as video production, language learning, or business.

Those considering commercial use, such as YouTube monetization, should also carefully check the terms of use and use a voice synthesis software that allows commercial use.

For beginners, it is recommended to first use an easy-to-use web app-type voice synthesis software.

With Ondoku, you can experience voice synthesis easily right now, for free and without installation.

The possibilities of voice synthesis software are infinite.

Why don't you first experience voice synthesis software that can be used for free?

■ 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.