InstaSub For Substitutes

InstaSub for Substitutes Find and Accept Jobs.

School Improvement Group,LLC · com.subzzapp

Not rated yet 1K+ downloads v3.0.3 18.1 MB Android 4.1+ PEGI 3 · Everyone

Download APK 18.1 MB All versions

Signature matches the Google Play version Details

At a glance

Latest version: v3.0.3 (79)
Updated: Jun 26, 2026 (3 months ago)
APK size: 18.1 MB
Requires: Android 4.1+ (API 16)
CPU support: Any (no native code)
Category: Education (app)
Listed since: Jul 27, 2021 (at least)
Permissions: 14 (7 sensitive)
Website: subzz.com
Developer contact: [email protected]
Privacy: Developer's privacy policy

About this APK

InstaSub For Substitutes is an app by School Improvement Group,LLC in the Education category, listed since at least July 2021. It has no native code, so it runs on any Android processor.

It asks for 14 permissions, 7 of them sensitive, including read calendar, read media images and read media video.

What's new in v3.0.3

New Features Include: - Filter button implemented on Available, Schedule and Past screen - Settings - School Settings, Categories Settings, Notification & Reminders, Training Guide - Help - Get Started Guide, Support Center, Contact Us - User Settings - Feedback - Report Issues [IMPROVED] - Bugs fixes and app performance enhancement

Description

From the listing uploaded by “appupdater”.

The InstaSub mobile app for substitutes provides a quick and easy way to view and accept jobs. Features include: Instant job alerts Accept/Decline jobs with a click View Available Jobs, Scheduled Jobs and Past Jobs A InstaSub account with substitute permission is required to use this app. About InstaSub In addition to our time tracking and employee scheduling solutions, InstaSub will give us the ability to offer a highly efficient way to manage absences and substitute teachers. The InstaSub solution will continue to give K-12 administrators the functionality they need to ensure classes are covered without issue, with an added layer of reporting from a centralized location and automated notifications to streamline communication.

Security & authenticity

Security rating: Trusted

Signing certificate

Signature matches the Google Play version Checked by the source store on Jun 26, 2026.
Certificate from Google Play App Signing Google keeps the signing key for the developer, so the certificate carries Google's name.

Store checks and file details

Developer signature verified Jun 26, 2026
Validated against Google Play Jun 26, 2026
Signed byCN=Android, OU=Android, O=Google Inc., L=Mountain View, ST=California, C=US
Signing certificate (SHA-1)D3:8D:69:94:3D:C8:C8:A8:A7:50:EE:FC:E4:AD:2E:CD:95:D3:17:84
File MD50c10ba250700c7f68f0cc7900ee337ed
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. AAPKs doesn't scan files itself — compare the MD5 and signer after downloading.

Permissions (14)

InstaSub For Substitutes requests 14 permissions, 7 of them sensitive.

Modify shared storage Sensitive android.permission.WRITE_EXTERNAL_STORAGE
Read calendar Sensitive android.permission.READ_CALENDAR
Read media audio Sensitive android.permission.READ_MEDIA_AUDIO
Read media images Sensitive android.permission.READ_MEDIA_IMAGES
Read media video Sensitive android.permission.READ_MEDIA_VIDEO
Read shared storage Sensitive android.permission.READ_EXTERNAL_STORAGE
Write calendar Sensitive android.permission.WRITE_CALENDAR
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) com.subzzapp.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION
Prevent the device from sleeping android.permission.WAKE_LOCK
Receive push notifications com.google.android.c2dm.permission.RECEIVE
Run foreground services android.permission.FOREGROUND_SERVICE
View network connections android.permission.ACCESS_NETWORK_STATE

Required hardware & features

Basic touch input android.hardware.faketouch