# InstaSub vs John Rex Charter School

The clearest difference is ratings volume: InstaSub at 259 against John Rex Charter School's 6. InstaSub also leads on device support (3 vs 1) and iOS requirement (12.0 vs 16.0). John Rex Charter School's advantage is rating (4.7 vs 4.5). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

John Rex Charter School holds the better App Store score, 4.7 against 4.5. That said, the two scores are not equally well evidenced: InstaSub has 259 ratings behind it against 6, so its average is the more settled of the two.

InstaSub ships an update every 6 weeks, John Rex Charter School every 5 weeks. The most recent releases landed on November 3, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | InstaSub | John Rex Charter School |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (259 ratings)](https://appshunter.io/ios/app/instasub/id1501485445/reviews) | **[4.7 (6 ratings)](https://appshunter.io/ios/app/john-rex-charter-school/id6742418956/reviews)** |
| Number of ratings | **259** | 6 |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 5 weeks** |
| Monetization | Free | Free |
| Size | 24 MB | 146 MB |
| Requires iOS | **12.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Humanity.com, LLC](https://appshunter.io/developer/864258525) | [John Rex Charter School](https://appshunter.io/developer/1798289784) |

## What reviewers say

### InstaSub

[App page](https://appshunter.io/ios/app/instasub/id1501485445)

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.

**Highlights:** Accept/Decline jobs, View job history, Post and manage absences, Schedule substitute requests, Approve/Deny time-off, Absence reporting

**Features:** Vision Pro support

**In-app purchases:** none


### John Rex Charter School

[App page](https://appshunter.io/ios/app/john-rex-charter-school/id6742418956)

Stay informed about school events, receive customized notifications for your student's organizations, and access weekly cafeteria menus. Get district updates and easily find staff contact information.

**Highlights:** Event listings with calendar integration, Customizable notifications by student organization, Weekly cafeteria menus, District live feed updates, Staff and department contact directory

**In-app purchases:** none


## Frequently asked questions

### Is InstaSub free?

InstaSub is free to download, with no in-app purchases.

### Is John Rex Charter School free?

John Rex Charter School is free to download, with no in-app purchases.

### Which has better reviews, InstaSub or John Rex Charter School?

John Rex Charter School is rated higher. InstaSub averages 4.5 out of 5 from 259 ratings, while John Rex Charter School averages 4.7 from 6 ratings.

### Do InstaSub or John Rex Charter School have ads?

Neither InstaSub nor John Rex Charter School shows ads.

### Which is updated more often, InstaSub or John Rex Charter School?

InstaSub ships an update every 6 weeks, and John Rex Charter School every 5 weeks. Most recently, InstaSub was updated on November 3, 2026 and John Rex Charter School on October 30, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*