Points for choosing the best plan from the free and paid plans for Ondoku text-to-speech
Jan. 26, 2026
Hello, in this article, we will explain the key points when choosing a pricing plan for Ondoku.
Ondoku has a Free Plan that can be used for free and Paid Plans starting from 980 yen.
- Free Plan: (5,000 characters/month): Free/month
There are various types of Paid Plans depending on the number of characters used.
- Basic Plan (200,000 characters/month): 980 yen/month
- Value Plan (450,000 characters/month): 1980 yen/month
- Premium Plan (1,000,000 characters/month): 2980 yen/month
- Business Plan (For business use)
With so many plans available, many people wonder, "Which one should I use?"
In fact, we have received several inquiries with such questions.
Therefore, in this article, we will suggest the right plan for you while introducing some examples.
Ondoku Free Plan
Ondoku can be used for commercial purposes even with the Free Plan.
- You can use it on YouTube channels that are already generating revenue.
- You can also insert it into PowerPoint materials for presentations.
※Please be sure to check, as there are some prohibited acts.
However, when using the Free Plan, we ask that you always include credit notation.
Ondoku does not place advertisements on the site, nor are there any sponsors.
Furthermore, due to the characteristics of the speech synthesis engine used, Ondoku incurs usage fees for every character you read aloud.
Because of this, we ask those on the Free Plan to help us by letting more people know about Ondoku.
Your help is needed so that Ondoku can maintain this service.
We also ask for credit notation when you return from a regular Paid Plan to the Free Plan.
About Credit Notation

When using Ondoku with the Free Plan, credit notation is always required regardless of whether you are a corporation or an individual.
Credit notation must be done in a way that someone listening to the Ondoku audio can tell that "this audio is Ondoku."
For things that are not visible, such as voice guidance, please subscribe to a Paid Plan.
Also, please continue the plan during the period you are using the audio.
If you return from a Paid Plan to the Free Plan tier, please include credit notation on videos such as YouTube or on managed sites.
In the case of use in voice guidance, please stop using Ondoku audio.
Points for choosing between Ondoku Free Plan and Paid Plan

- Is it for outsourced work, embedding in products for sale, or use in broadcast media?
- Approximately how many characters will be used per month?
- Is it okay to include credit notation?
- For how long will the audio be used?
It is easier to decide on a plan based on these points.
1. Is it for outsourced work, embedding in products for sale, or use in broadcast media?
In Ondoku, using the Free Plan or regular Paid Plans for "outsourced work, embedding in products for sale, or broadcast media" is considered a prohibited act and is not permitted.
However, the Business Plan can be used for outsourced work.
Please see here for the detailed features of the Business Plan.
Detailed information on the Business Plan of the text-to-speech software "Ondoku". Features, prices, etc. | Text-to-speech software Ondoku
By subscribing to a Business Plan, you will be exempt from some of the usage methods prohibited in the prohibited acts. We will provide details on what you can do with the Ondoku Business Plan.
2. Approximately how many characters will be used per month?
【Free Plan】
- Non-member: 1,000 characters
- Member: 5,000 characters
【Paid Plan】
- Basic: 200,000 characters
- Value: 450,000 characters
- Premium: 1,000,000 characters
Thus, the plan you choose differs depending on the number of characters that can be read aloud per month.
You can find the optimal plan by choosing how much you want to read aloud.
3. Is it okay to include credit notation?
Depending on the intended use, there may be things where credit notation can be done, cannot be done, or is not desired.
For things where credit notation is possible, such as YouTube or Twitter videos, you can use either the Free Plan or a Paid Plan.
For things where you do not want to include credit notation, such as company PR videos or materials, please subscribe to a Paid Plan.
※Except for the Business Plan, please be sure to include credit notation after canceling a Paid Plan.
When used for things where credit notation is not possible, such as voice guidance, please be sure to subscribe to a Paid Plan for the duration the audio is used.
4. For how long will the audio be used?
Basically, audio data created with Ondoku can be used indefinitely.
However, in the case of the Free Plan, credit notation is required, and in the case of a Paid Plan (if you do not want to include credit notation), please continue the subscription for the period it is being used.
In the case of the Business Plan, audio data created during the usage period can be used continuously without credit notation forever.
Specific usage examples and how to choose the recommended plan
Example 1: Credit notation OK, want to use the audio indefinitely
→ If the number of characters used is small, the Free Plan is OK
→ Use a Paid Plan, and include credit notation when returning to the Free Plan
Example 2: Credit notation OK, want to use on a YouTube channel generating revenue
Regardless of whether there is revenue, please consider the plan based on the number of characters you use.
→ If the number of characters used is small, the Free Plan is OK
→ Use a Paid Plan, and include credit notation when returning to the Free Plan
Example 3: Credit notation NG, use only while on a Paid Plan
→ Regular Paid Plan
Example 4: Credit notation NG, want to use audio indefinitely
→ Business Plan
Example 5: Want to use for outsourced work
→ Business Plan
Example 6: Want to use for educational materials distributed for free
When credit notation is OK
Please consider the plan based on the number of characters you use.
→ If the number of characters used is small, the Free Plan is OK
→ Use a Paid Plan, and include credit notation when returning to the Free Plan
When credit notation is NG
→ Business Plan
Example 7: Want to use for educational materials distributed for a fee
→ Business Plan
For details on each plan, payment methods, etc., please see this blog for more information.
Pricing Plan Japanese Text-to-Speech Software|Ondoku
Text-to-speech software Ondoku can read aloud up to 5,000 characters for free. Also, with a Paid Plan, you can read aloud up to 1,000,000 characters per month. Text read aloud with high-quality audio can be saved as audio files (.mp3) and is also available for commercial use.
About Ondoku's payment methods (credit card, debit card, bank transfer) and receipts | Text-to-speech software Ondoku
We will explain Ondoku's payment methods and receipts. Methods for issuing invoices and receipts for bank transfers. How to subscribe to a Business Plan. Issuing receipts for all methods, etc.
Inquire about plans and usage methods
"I want to ask/confirm which plan I should use for my specific case!"
In such cases, please fill in the following items and contact us.
Ondoku: Contact us here
Subject: Inquiry about commercial use
Which plan will you use:
- Free
- Free or the 980 yen per month plan
- Monthly Paid Plan
- Business Plan
- Other (specifically)
Is credit notation possible:
- Yes
- No
Who will create the audio with Ondoku:
- Myself / My company
- Outsourced / Third party / Subsidiary
Who will listen to the audio: (multiple choices possible)
- Myself
- YouTube viewers
- Internal staff
- App users
- General public
- Other (specifically)
Is it for sale:
- Paid sale/distribution
- Free distribution/delivery
- No sale/distribution
- Other (specifically)
On what device/software will the audio be used: (multiple choices possible)
- PC / Smartphone
- Embedded device
- CD / DVD player
- Other (specifically)
Distribution or delivery method: (multiple choices possible)
- YouTube
- Smartphone app
- PC software
- CD / DVD
- Download content
- Presentation
- None
- Other (specifically)
Will it be used by embedding it in a device or product:
- Yes
- No
In what scenario will it be used (as specifically as possible):
Example
- I am planning to use it in PowerPoint slides for internal company training. We plan to make a DVD for internal sharing and storage. I cannot provide credit notation; may I use it for free? If paid, can I use the Basic Plan for 980 yen per month?
- I would like to use it for character voices in an independently developed smartphone app. I am thinking of including credit notation in the CV column; is free use possible?
- If I include credit notation on the equipment chassis, can I use it for free?
Ondoku: Contact us here
■ 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.
Email: ondoku3.com@gmail.com
"Ondoku" is a Text-to-Speech service that anyone can use for free without installation. If you register for free, you can get up to 5000 characters for free each month. Register now for free