# ReadySub vs InstaSub

The clearest difference is rating: InstaSub at 4.4 against ReadySub's 2.0. InstaSub also leads on update cadence (every 6 weeks vs every 5 months). ReadySub's advantage is review sentiment (18% vs 0%). On price, ratings volume, 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 holds the better App Store score, 4.4 against 2.0. Both are backed by a comparable volume of ratings — 136 and 241 respectively. Written reviews complicate that: 18% of ReadySub's written reviews are positive against 0% of InstaSub's, so the app with the better star average is not the one people write more warmly about.

ReadySub ships an update every 5 months, InstaSub every 6 weeks. The most recent releases landed on October 14, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | ReadySub | InstaSub |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.0 (136 ratings)](https://appshunter.io/ios/app/readysub/id970293978/reviews) | **[4.4 (241 ratings)](https://appshunter.io/ios/app/instasub/id1501485445/reviews)** |
| Number of ratings | 136 | **241** |
| Positive reviews | **18.5% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 6 weeks** |
| Monetization | Free | Free |
| Size | 9 MB | 24 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Glass Arc LLC](https://appshunter.io/developer/970293977) | [Humanity.com, LLC](https://appshunter.io/developer/864258525) |

## What reviewers say

### ReadySub

[App page](https://appshunter.io/ios/app/readysub/id970293978)

Manage substitute teaching assignments conveniently from your mobile device. View and accept available jobs directly on your iPhone or iPad. This application is completely free to use.

**Highlights:** Manage substitute assignments, View jobs on mobile, Accept jobs on the go, Free to use

**Features:** macOS Compatibility

**In-app purchases:** none

**What reviewers like**

- 👍 Easy to accept jobs
- 👍 Simple tool to review jobs
- 👍 Intuitive and easy to use
- 👍 Quick and easy access to jobs

**What reviewers complain about**

- 🐛 Notifications don't work
- 🐛 App is primitive/basic
- 🐛 Lacks functionality
- 🐛 Useless for teachers
- 🐛 Only shows available jobs

**Reported bugs**

- Notifications never work
- Missed job opportunities due to lack of notifications
- iPhone app is primitive
- No push notifications
- App does not show a calendar for accepted assignments

**Requested features**

- Filter selected schools and grade levels
- Send notifications when jobs are available
- Show calendar for accepted assignments
- Immediate text notifications
- View accepted jobs


### 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 ReadySub free?

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

### Is InstaSub free?

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

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

InstaSub is rated higher. ReadySub averages 2.0 out of 5 from 136 ratings, while InstaSub averages 4.4 from 241 ratings.

### Do ReadySub or InstaSub have ads?

Neither ReadySub nor InstaSub shows ads.

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

ReadySub ships an update every 5 months, and InstaSub every 6 weeks. Most recently, ReadySub was updated on October 14, 2026 and InstaSub on October 16, 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.*