ロック画面漢字（漢字・四字熟語・ことわざの学習アラーム）
You can automatically memorize kanji and four-character idioms.
- Total installs
- 228,019
- Installs / day
- —
- Rating
- —★
- Released
- 22 Jun 2025
- Last update
- 22 Sept 2026
- Countries
- —
Install history
exact counter from Google PlayInstalls per day · last 90 days
Change timeline
No changes recorded yet. We compare every crawl with the previous one and list title, icon, screenshots, description, version, price and availability changes here.
Country availability
Availability has not been checked for this app yet. “Check all countries” looks the app up in about 140 Google Play storefronts and shows where it is live, listed but not installable, or missing — plus any country-specific (custom) store listings.
Top countries
estimate · charts of 11 OctMost downloads likely come from 🇯🇵 Japan (~100%).
Estimated from top-chart positions weighted by each country’s Google Play market size. Countries where the app is not in a chart are not shown, so small markets may be missing.
Top chart positions
as of 11 Oct| Chart | Country | Rank | Change |
|---|---|---|---|
| Top free · Education | JP | #36 | — |
App manifest
Read this app's manifest from Google Play: permissions, declared SDKs, components and AdMob app ID. Saved analysis appears here automatically.
Data safety
declared by the developer on Google Play- Shares data with third parties Location and Device or other IDs
- No data collected
- Data is not encrypted
This is the developer's own declaration, summarised from the Play listing. The permissions below show what the app is technically able to access.
Permissions
22 in 8 groupsWhat this app can do with your phone
- Know roughly where you are, using mobile towers and Wi-Fi networks
- Know your exact location using GPS, Wi-Fi and mobile networks
- Use your camera to take photos and record videos
- Read photos, videos, and other files saved in your phone's shared storage
- Add, change or delete photos, videos and other files in your phone's storage
- Show its own windows or bubbles on top of other apps you are using
LocationSensitive2
Access to where your device is, using GPS or network signals
- Know roughly where you are, using mobile towers and Wi-Fi networksapproximate location (network-based) ·
ACCESS_COARSE_LOCATION - Know your exact location using GPS, Wi-Fi and mobile networksprecise location (GPS and network-based) ·
ACCESS_FINE_LOCATION
Photos/Media/FilesSensitive2
Access to photos, videos, music and other files stored on your device
- Read photos, videos, and other files saved in your phone's shared storageread the contents of your USB storage ·
READ_EXTERNAL_STORAGE - Add, change or delete photos, videos and other files in your phone's storagemodify or delete the contents of your USB storage ·
WRITE_EXTERNAL_STORAGE
StorageSensitive2
Access to files, photos and media saved on your phone's storage
- Read photos, videos, and other files saved in your phone's shared storageread the contents of your USB storage ·
READ_EXTERNAL_STORAGE - Add, change or delete photos, videos and other files in your phone's storagemodify or delete the contents of your USB storage ·
WRITE_EXTERNAL_STORAGE
CameraSensitive1
Access to your camera to take photos and record video
- Use your camera to take photos and record videostake pictures and videos ·
CAMERA
PhoneNotable1
Access to phone calls, call history, and voicemail
- See your phone number, device IDs, whether a call is active, and the other caller's numberread phone status and identity ·
READ_PHONE_STATE
Device ID & call informationNotable1
Access to your phone's identifiers, mobile network details, and call status
- See your phone number, device IDs, whether a call is active, and the other caller's numberread phone status and identity ·
READ_PHONE_STATE
Wi-Fi connection informationRoutine1
Access to details about Wi-Fi networks your device sees or uses
- See whether Wi-Fi is on and details of the network you are connected toview Wi-Fi connections ·
ACCESS_WIFI_STATE
OtherSensitive12
Access to miscellaneous device features that don't fit other categories
- Show its own windows or bubbles on top of other apps you are usingdraw over other apps ·
SYSTEM_ALERT_WINDOW - Connect to or disconnect from Wi-Fi networks and change saved Wi-Fi settingsconnect and disconnect from Wi-Fi ·
CHANGE_WIFI_STATE - Temporarily turn off your screen lock, for example to show an incoming calldisable your screen lock ·
DISABLE_KEYGUARD - Start itself automatically as soon as your phone finishes turning onrun at startup ·
RECEIVE_BOOT_COMPLETED - Bring apps to the front or send them to the backgroundreorder running apps ·
REORDER_TASKS - Keep your phone's processor or screen from going to sleep, which can use more batteryprevent device from sleeping ·
WAKE_LOCK - Check whether you are online and whether you use Wi-Fi or mobile dataview network connections ·
ACCESS_NETWORK_STATE - Connect to the internet to load content and send datafull network access ·
INTERNET - Make your phone vibratecontrol vibration ·
VIBRATE - Check with Google Play that you got this app legitimatelyGoogle Play license check ·
com.android.vending.CHECK_LICENSE - Read Google service settings stored on your deviceread Google service configuration ·
com.google.android.providers.gsf.permission.READ_GSERVICES - Receive push messages sent from the app's servers over the internetreceive data from Internet ·
com.google.android.c2dm.permission.RECEIVE
Sensitive = can reach personal data, location, camera/mic or act on your behalf. Notable = changes how your device behaves. Routine = normal for almost every app. Source: Google Play's permission list for all versions of this app.
Store listing
Full description
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