# InstaSub vs SubSpark

The clearest difference is review sentiment: SubSpark at 100% against InstaSub's 0%. SubSpark also leads on rating (5.0 vs 4.4) and update cadence (every 4 days vs every 6 weeks). InstaSub's advantage is ratings volume (241 vs 8) and iOS requirement (12.0 vs 15.1). On price, ads, in-app purchases and monetization model there is nothing between them.

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

SubSpark holds the better App Store score, 5.0 against 4.4. That said, the two scores are not equally well evidenced: InstaSub has 241 ratings behind it against 8, so its average is the more settled of the two. Written reviews point the same way: 0% of InstaSub's written reviews are positive against 100% of SubSpark's.

InstaSub ships an update every 6 weeks, SubSpark every 4 days. The most recent releases landed on September 21, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | InstaSub | SubSpark |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.4 (241 ratings)](https://appshunter.io/ios/app/instasub/id1501485445/reviews) | **[5.0 (8 ratings)](https://appshunter.io/ios/app/subspark/id6575345302/reviews)** |
| Number of ratings | **241** | 8 |
| Positive reviews | 0.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 4 days** |
| Monetization | Free | Free |
| Size | 24 MB | 33 MB |
| Requires iOS | **12.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Humanity.com, LLC](https://appshunter.io/developer/864258525) | [SubSpark, LLC](https://appshunter.io/developer/1759240288) |

## 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


### SubSpark

[App page](https://appshunter.io/ios/app/subspark/id6575345302)

This app streamlines substitute teacher management for schools. It allows administrators and teachers to quickly find, book, and manage substitute educators, eliminating the need for traditional, time-consuming methods. The platform aims to ensure consistent coverage and reduce scheduling chaos.

**Highlights:** Fast and easy booking of substitute teachers, Build and manage preferred substitute lists, All-in-one admin dashboard (desktop), Intuitive and user-friendly interface, Reduces scheduling complexity

**In-app purchases:** none


## Frequently asked questions

### Is InstaSub free?

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

### Is SubSpark free?

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

### Which has better reviews, InstaSub or SubSpark?

SubSpark is rated higher. InstaSub averages 4.4 out of 5 from 241 ratings, while SubSpark averages 5.0 from 8 ratings.

### Do InstaSub or SubSpark have ads?

Neither InstaSub nor SubSpark shows ads.

### Which is updated more often, InstaSub or SubSpark?

InstaSub ships an update every 6 weeks, and SubSpark every 4 days. Most recently, InstaSub was updated on September 21, 2026 and SubSpark on September 9, 2026.

---

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