# InstaSub vs Harding Charter Prep

The clearest difference is device support: InstaSub at 3 against Harding Charter Prep's 1. InstaSub also leads on iOS requirement (12.0 vs 16.0). 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.

InstaSub ships an update every 6 weeks, Harding Charter Prep monthly. The most recent releases landed on October 24, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | InstaSub | Harding Charter Prep |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (255 ratings)](https://appshunter.io/ios/app/instasub/id1501485445/reviews)** | — |
| Number of ratings | **255** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Monthly** |
| Monetization | Free | — |
| Size | 24 MB | 142 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) | [Harding Charter Prep](https://appshunter.io/developer/1896278617) |

## 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


### Harding Charter Prep

[App page](https://appshunter.io/ios/app/harding-charter-prep/id6766340940)

**In-app purchases:** none


## Frequently asked questions

### Is InstaSub free?

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

### Is Harding Charter Prep free?

Harding Charter Prep is free to download, with no in-app purchases.

### Do InstaSub or Harding Charter Prep have ads?

Neither InstaSub nor Harding Charter Prep shows ads.

### Which is updated more often, InstaSub or Harding Charter Prep?

InstaSub ships an update every 6 weeks, and Harding Charter Prep monthly. Most recently, InstaSub was updated on October 24, 2026 and Harding Charter Prep on October 19, 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.*