InstaSub vs Sub Start
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
InstaSub
This app streamlines job management for educators and administrators. It allows substitutes to easily accept or decline jobs, while teachers can post and manage absences. Administrators benefit from efficient scheduling and reporting tools.
- Accept/Decline jobs
- View job history
- Post and manage absences
- Schedule substitute requests
- Approve/Deny time-off
- Absence reporting
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The InstaSub mobile app provides a quick and easy way to view and accept jobs, post absences, request subs and manage absences. Features include: Substitutes can: Accept/Decline jobs with a click View Available Jobs, Scheduled Jobs and Past Jobs View and update Notification Settings for email, text and push alerts Teachers can: Post Absences View Scheduled, Past and Denied Absences Post Internal Coverage Absences Cancel Absences Admins can: Scheduling Sub Requests Approve/Deny time-off requests View Filled Jobs and Unfilled Jobs Daily/Monthly Absence Reports An InstaSub account with Substitute, Teacher, or Admin permission is required to use this app. About InstaSub In addition to our time tracking and employee scheduling solutions, InstaSub gives users the ability to offer a highly efficient way to manage absences for teachers. InstaSub continues to provide K-12 administrators with the functionality they need to ensure optimal staffing, centralized reporting, and automated notifications to streamline communication.
Sub Start
This app streamlines substitute teacher booking and management for childcare programs. It offers features like check-in/out, messaging, document management, and worksite insights. Available in multiple languages, it aims to simplify administrative tasks for educational facilities.
- Substitute teacher booking management
- Check-in/out functionality
- Messaging and alerts
- Document management
- Worksite insights
- Multi-language support
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Sub Start is a revolutionary app designed specifically for childcare programs that simplifies substitute teacher booking and management. It integrates all the essential tools on one platform, including check-in/out, messaging, and much more. Sub Start Features 【BOOKING MANAGEMENT】 －Post and manage availability. - Receive booking and cancellation messages. - Check-in and check-out for work. 【NOTIFICATION AND ALERTS】 - Receive email and text alerts. - Instantly receive urgent announcements. 【WORKSITE INSIGHTS】 - Access detailed worksite information. - Set up preferred worksites. - Track your work history with ease. - Write center reviews. 【EFFORTLESS DOCUMENT MANAGEMENT】 - Easily upload and manage qualification documents. 【WORK STATUS MANAGEMENT】 - Seamlessly update and maintain your current work status. 【ACCESSIBILITY AND LANGUAGE OPTIONS】 - Available in three languages. And…much more coming! We’re committed to innovation with frequent improvements and new features. Start simplifying childcare program management with Sub Start today!
Screenshots
Verdict
The clearest difference is review sentiment: Sub Start at 100% against InstaSub's 0%. InstaSub's advantage is ratings volume (241 vs 5) and rating (4.4 vs 4.2). On price, update cadence, ads and in-app purchases there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
InstaSub holds the better App Store score, 4.4 against 4.2. That said, the two scores are not equally well evidenced: InstaSub has 241 ratings behind it against 5, so its average is the more settled of the two. Written reviews complicate that: 0% of InstaSub's written reviews are positive against 100% of Sub Start's, so the app with the better star average is not the one people write more warmly about.
InstaSub ships an update every 6 weeks, Sub Start every 2 months. The most recent releases landed on September 21, 2026 and September 13, 2026 respectively.
| Parameter | InstaSub | Sub Start |
|---|---|---|
| Price | Free | Free |
| Rating | 4.4 (241 ratings) — better | 4.2 (5 ratings) |
| Positive reviews | 0.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 241 — better | 5 |
| Update frequency | Every 6 weeks — better | Every 2 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 12.0 — better | 14.0 |
| Further details — not scored | ||
| Size | 24 MB | 86 MB |
| Age rating | 4+ | 4+ |
| Developer | Humanity.com, LLC | SubStart |
Customer experience
InstaSub
Sub Start
In-app purchases
InstaSub
No in-app purchases
Sub Start
No in-app purchases
