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Kioku: Japanese Word Widget
Japanese on your Lock Screen
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What’s New Version 1.2.0
Passive learning, now with a way to make it stick.
Test Mode (Pro): quiz yourself on the exact words your Lock Screen has already shown you. No decks to build, Kioku knows what you've seen.
Themed practice (Pro): focus on food, travel, work, and more. 10 topics across every JLPT level.
Plus smoother transitions throughout, and a fix for a few words that were showing the wrong reading.
Description
Learn Japanese without opening an app.
Kioku turns your lock screen into a passive learning surface. A new word appears every morning, with kanji, reading, and meaning, so you can build your vocabulary just by glancing at your phone. No flashcards. No streaks. No study sessions.
START WHERE YOU ARE
New to Japanese? Kioku starts with hiragana and katakana, the foundation. Already past the basics? Jump straight into JLPT N5 vocabulary. Everything beginner is free.
HOW IT WORKS
1. Install Kioku
2. Choose your level (hiragana, katakana, or JLPT N5)
3. Add the widget to your lock screen
4. Glance throughout your day
5. Words stick through repetition, not memorization
A QUIET DESIGN
No mascots. No streak guilt. No notifications begging you to come back. Just a calm, editorial layout inspired by Japanese paper and typography. Noto Serif JP for the characters, soft warm crimson, generous space.
FREE FOREVER
• Hiragana (46 characters)
• Katakana (46 characters)
• JLPT N5 vocabulary (~670 words)
• 1 word per day
• Full lock screen and home screen widgets
UNLOCK MORE WITH PRO
Try Pro free for 7 days. Then $1.99/month, $9.99/year, or $19.99 one-time.
• All JLPT levels: N5, N4, N3, N2, N1 (~13,000 words)
• Up to 4 words per day
• Future features included
Cancel anytime.
WHY KIOKU
Most language apps assume you have time and willpower to open them daily. You don't, and that's okay. Kioku meets you where you already are, the screen you check 50+ times a day. Learning becomes ambient. It happens in the background of your life.
Fully offline. No account, no data collection, no ads. Just words on your lock screen.
ATTRIBUTION
Dictionary data: JMdict/EDICT
© Electronic Dictionary Research and Development Group (EDRDG)
License: Creative Commons Attribution-ShareAlike 4.0
https://www.edrdg.org/jmdict/j_jmdict.html
PRIVACY
Kioku does not collect, transmit, or store any personal data. All vocabulary is bundled with the app. No account required.
Privacy Policy: https://hibana-com.github.io/kioku-site/privacy
Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
In-App Purchases US pricing
Kioku Pro Subscription
Monthly · Monthly$1.99
Yearly · Yearly 7-day free trial$9.99
One-Time Purchases
Kioku Pro Lifetime$19.99
Capabilities
In-App Purchases
Accessibility
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Version history 4 versions
Build 887332505v1.2.02026-06-24 21:24:10
Passive learning, now with a way to make it stick.
Test Mode (Pro): quiz yourself on the exact words your Lock Screen has already shown you. No decks to build, Kioku knows what you've seen.
Themed practice (Pro): focus on food, travel, work, and more. 10 topics across every JLPT level.
Plus smoother transitions throughout, and a fix for a few words that were showing the wrong reading.
Build 886464674v1.1.12026-06-03 17:34:09
A welcoming start for new learners.
• Hiragana and katakana are now free, alongside JLPT N5
• Try Pro free for 7 days to unlock all JLPT levels (N4 to N1) and up to 4 words per day
• Added Portuguese (Brazilian) language support
• Fixed a sync issue between the lockscreen widget and the app
• Refined word selection so changing your daily rotation no longer shifts the current word
Build 886415848v1.1.02026-06-02 18:30:08
A welcoming start for new learners.
• Hiragana and katakana are now free, alongside JLPT N5
• Try Pro free for 7 days to unlock all JLPT levels (N4 to N1) and up to 4 words per day
• Added Portuguese (Brazilian) language support
• Fixed a sync issue between the lockscreen widget and the app
• Refined word selection so changing your daily rotation no longer shifts the current word
Build 883740081v1.0.02026-04-21 08:05:15
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Availability 1 of 1 storefronts
| Region | Language | Price | Ratings | Avg | Version |
|---|---|---|---|---|---|
| US | en-US | Free | 0 | — | 1.2.0 |
Change log 8 changes · US
✎
releaseNotes updated
Passive learning, now with a way to make it stick.
Test Mode (Pro): quiz yourself on the exact words your Lock Screen has already shown you. No decks to build,
✎
description updated
Learn Japanese without opening an app.
Kioku turns your lock screen into a passive learning surface. A new word appears every morning, with kanji, reading, and
✎
subtitle updated
Japanese on your Lock Screen
✎
name updated
Kioku: Japanese Word Widget
◆
Version 1.2.0 released
Passive learning, now with a way to make it stick.
Test Mode (Pro): quiz yourself on the exact words your Lock Screen has already shown you. No decks to build, Kioku knows what you've seen.
Themed practice (Pro): focus on food, travel, wo
◆
Version 1.1.1 released
A welcoming start for new learners.
• Hiragana and katakana are now free, alongside JLPT N5
• Try Pro free for 7 days to unlock all JLPT levels (N4 to N1) and up to 4 words per day
• Added Portuguese (Brazilian) language support
• Fixed a
◆
Version 1.1.0 released
A welcoming start for new learners.
• Hiragana and katakana are now free, alongside JLPT N5
• Try Pro free for 7 days to unlock all JLPT levels (N4 to N1) and up to 4 words per day
• Added Portuguese (Brazilian) language support
• Fixed a
◆
Version 1.0.0 released