# SchoolAxis CURB vs InstaSub

The clearest difference is update cadence: InstaSub at every 6 weeks against SchoolAxis CURB's every 8 months. On price, ads, in-app purchases and device support there is nothing between them.

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

SchoolAxis CURB ships an update every 8 months, InstaSub every 6 weeks. The most recent releases landed on October 18, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | SchoolAxis CURB | InstaSub |
| --- | --- | --- |
| 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 8 months | **Every 6 weeks** |
| Monetization | — | Free |
| Size | 75 MB | 24 MB |
| Requires iOS | 13.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Canopy Network, LLC](https://appshunter.io/developer/975449628) | [Humanity.com, LLC](https://appshunter.io/developer/864258525) |

## What reviewers say

### SchoolAxis CURB

[App page](https://appshunter.io/ios/app/schoolaxis-curb/id1023598813)

**In-app purchases:** none


### 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


## Frequently asked questions

### Is SchoolAxis CURB free?

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

### Is InstaSub free?

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

### Do SchoolAxis CURB or InstaSub have ads?

Neither SchoolAxis CURB nor InstaSub shows ads.

### Which is updated more often, SchoolAxis CURB or InstaSub?

SchoolAxis CURB ships an update every 8 months, and InstaSub every 6 weeks. Most recently, SchoolAxis CURB was updated on October 18, 2026 and InstaSub on October 24, 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.*