KoeLab - Japanese Diction
Pronunciation & speech trainer
Only for iPhone
Free · Designed for iPhone. Not verified for macOS.
iPhone
No more "Sorry, what?" Read aloud and KoeLab reveals your weak sounds. Recordings stay on your device, no account needed. Your only rival is your past self.
"I mumble." "People keep asking me to repeat myself." "I just can't like my own voice." You can change all of that—privately, at your own pace.
KoeLab is a diction training app for speaking Japanese more clearly. Just start by reading a phrase aloud. The app analyzes your voice objectively and shows you exactly which sounds you struggle with. Once you can see the weak spots you never noticed, all that's left is to practice them—again and again. The more you keep at it, the more those tricky sounds loosen up, and your voice starts to land.
And all of it happens entirely on your device. Your recordings are never sent anywhere.
■ Start by getting to know your own voice
We can't hear our own voices accurately. KoeLab analyzes your pronunciation from the sound itself and makes your weak sounds and habits visible. Turning a vague "my speech is unclear" into a specific "this sound is weak" is the first step toward improvement.
■ Anytime, as much as you like, over and over
Training is the heart of this app. With no time limit, read one phrase after another to build up your voice. Each round is short, so it's easy to fit into spare moments—and the more you continue, the smoother your weak sounds become. Right after scoring, you can play back your own voice and compare.
■ Find your weak sounds, then focus in
The app automatically picks out the sounds you keep stumbling on. One tap drops you into focused practice for just that sound, so you can target your weak points and improve efficiently.
■ Your only rival is your past self
No comparisons with others, no rankings, no social sharing. No daily quotas or streaks pushing you along. Just time to face your own voice, at your own pace.
■ Scored on four axes
Your voice is scored from multiple angles across four axes: mora accuracy, articulation clarity, prosody, and listenability. An optional "Pa-Ta-Ka" test also lets you self-check for signs of oral frailty.
■ A positive picture of your voice
From your acoustic features, KoeLab highlights the good in your voice—"bright and carrying," "soft and warm," "rich and resonant," and more. It never assigns negative labels.
■ Vowel target practice
Aim for the "a / i / u / e / o" targets and watch your pronunciation visualized in real time, so you can adjust as you go.
■ Script practice mode
Paste in a presentation or speech script and the spots with your weak sounds are highlighted—so you can rehearse just the places you're likely to trip over before the real thing.
■ Watch yourself change
Score trends, shifting weak points, and side-by-side playback of past and present recordings. The more you repeat, the more your progress stays on record.
■ A gentle nudge when you want one (optional)
Upbeat messages invite you back to training—loosely. Whether to turn them on is entirely up to you.
■ Who it's for
・Anyone self-conscious about their diction or pronunciation
・People who speak in public and want a voice that carries
・Anyone hoping to prevent oral frailty
・Anyone working on articulation or pronunciation self-care
・Everyone who simply wants to know their own voice objectively
■ Supported languages
Japanese / English / Korean
■ Privacy
Your recordings are processed entirely on your device and are never sent off it. No account required.
Requires iOS 17.0 or later. Microphone and speech recognition permissions required.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
・You can now play back recordings from past training sessions. Compare your earlier voice with today's and hear how you've changed.
・Minor improvements
The developer, Taiga Nishimura, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Usage Data
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Identifiers
- Usage Data
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Taiga Nishimura
- Size
- 6.7 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
English and 3 more
- English, Japanese, Korean, Simplified Chinese
- Age Rating
4+
- 4+
- Copyright
- © Taiga Nishimura