NHD-CA

The official National History Day - California (NHD-CA) state competition app

Gather Digital · net.scoe.gd.NHDCA

Not rated yet 1K+ downloads v1.9 38.3 MB Android 8.1+ PEGI 3 · Everyone

Download APK 38.3 MB All versions

Signature matches the Google Play version Details

At a glance

Latest version: v1.9 (10)
Updated: Apr 17, 2026 (6 months ago)
APK size: 38.3 MB
Requires: Android 8.1+ (API 27)
CPU support: x86 32-bit, x86 64-bit, ARM 32-bit, ARM 64-bit
Category: Business (app)
Listed since: Jun 13, 2021 (at least)
Permissions: 18 (4 sensitive)
Website: gatherdigital.com
Developer contact: [email protected]
Privacy: Developer's privacy policy

About this APK

NHD-CA is an app by Gather Digital in the Business category, listed since at least June 2021. It includes native code for x86 32-bit, x86 64-bit, ARM 32-bit and ARM 64-bit, so it runs on practically every phone.

Since version 1.5, the APK grew from 25 MB to 38.3 MB and the minimum Android version rose from 8.0 to 8.1. It asks for 18 permissions, 4 of them sensitive, including camera, read calendar and write calendar. Compared with version 1.8, it adds 1 new permission: “Detect screen recording”.

What's new in v1.9

Feature enhancements and stability improvements

Description

From the listing uploaded by “appupdater”.

The official National History Day - California (NHD-CA) app gives you the tools to navigate and stay up-to-date on the NHD-CA State Contest. The NHD-CA app allows you to create your own schedule of student-produced exhibits, documentaries, historical papers, performances, posters, and websites. The app also helps navigate the competition with maps, agendas, and much more! This is the NHD-CA, National History Day, National History Day - California, NHD-California, SCOE, NHDCA app.

Version history

4 versions are listed, going back to v1.5. Since v1.7 it requires Android 8.1+.

v1.9 LATEST Apr 17, 2026 38.3 MB TRUSTED v1.8 Aug 2, 2025 31.5 MB TRUSTED v1.7 Jan 15, 2025 31.5 MB TRUSTED v1.5 Apr 6, 2024 25 MB TRUSTED

All 4 versions

Security & authenticity

Security rating: Trusted

Signing certificate

Signature matches the Google Play version Checked by the source store on Apr 17, 2026.
Certificate issued to “Twin Particle LLC” This is the certificate of the Google Play version.
Same certificate as the 2 other versions checked

Store checks and file details

Developer signature verified Apr 17, 2026
Validated against Google Play Apr 17, 2026
Signed byOU=Gather Digital, O=Twin Particle LLC, L=Chapel Hill, ST=North Carolina, C=US
Signing certificate (SHA-1)15:5B:8A:1B:F8:AF:8D:D5:E6:C6:A8:4F:1E:00:01:7B:2C:59:16:7A
File MD5c4aab7f337ceb9663dd3d151584472c3
Uploaded by “appupdater” Gold tier · 117,810 followers · uploading since 2020

Scans and ratings come from the source store; the certificate comparisons are AAPKs's own, made from the files' published signatures (2 other versions compared). AAPKs doesn't scan files itself — compare the MD5 and signer after downloading.

Permissions (18)

NHD-CA requests 18 permissions, 4 of them sensitive.

Camera Sensitive android.permission.CAMERA
Read calendar Sensitive android.permission.READ_CALENDAR
Write calendar Sensitive android.permission.WRITE_CALENDAR
Write contacts Sensitive android.permission.WRITE_CONTACTS
Access adservices ad id android.permission.ACCESS_ADSERVICES_AD_ID
Access adservices attribution android.permission.ACCESS_ADSERVICES_ATTRIBUTION
Control vibration android.permission.VIBRATE
Detect screen recording android.permission.DETECT_SCREEN_RECORDING
Full network access android.permission.INTERNET
Google Play install referrer com.google.android.finsky.permission.BIND_GET_INSTALL_REFERRER_SERVICE
Internal broadcast protection (app-defined) net.scoe.gd.NHDCA.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION
Prevent the device from sleeping android.permission.WAKE_LOCK
Receive push notifications com.google.android.c2dm.permission.RECEIVE
Run at startup android.permission.RECEIVE_BOOT_COMPLETED
Run foreground services android.permission.FOREGROUND_SERVICE
Show notifications android.permission.POST_NOTIFICATIONS
View Wi-Fi connections android.permission.ACCESS_WIFI_STATE
View network connections android.permission.ACCESS_NETWORK_STATE

Required hardware & features

Basic touch input android.hardware.faketouch
Portrait screen android.hardware.screen.portrait
Wi-Fi android.hardware.wifi

NHD-CA APK: questions and answers

Is there a version of NHD-CA for older Android phones?

The current version needs Android 8.1 or later. Version 1.5 is the newest listed build that installs on Android 8.0 and later. It is an old build: apps that rely on online services may no longer connect when they are this old. Get version 1.5 · All versions

Can I install this APK over the version I already have?

Yes, if your installed copy is older. It is signed like the Google Play version, so Android installs it as an update and keeps your data.

Is the NHD-CA APK safe?

No one can promise that a file is safe, but some things can be checked. The source store rates this file Trusted. Its signature matches the Google Play version. It is signed with the same certificate as the 2 other versions checked. After downloading, check that the file's MD5 is c4aab7f337ceb9663dd3d151584472c3.