ReadySub vs InstaSub
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ReadySub
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.
- Manage substitute assignments
- View jobs on mobile
- Accept jobs on the go
- Free to use
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The ReadySub mobile app allows you to manage your substitute assignments on the go. You can view and accept jobs from your iPhone or iPad, and best of all, for free.
InstaSub
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.
- Accept/Decline jobs
- View job history
- Post and manage absences
- Schedule substitute requests
- Approve/Deny time-off
- Absence reporting
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The InstaSub mobile app provides a quick and easy way to view and accept jobs, post absences, request subs and manage absences. Features include: Substitutes can: Accept/Decline jobs with a click View Available Jobs, Scheduled Jobs and Past Jobs View and update Notification Settings for email, text and push alerts Teachers can: Post Absences View Scheduled, Past and Denied Absences Post Internal Coverage Absences Cancel Absences Admins can: Scheduling Sub Requests Approve/Deny time-off requests View Filled Jobs and Unfilled Jobs Daily/Monthly Absence Reports An InstaSub account with Substitute, Teacher, or Admin permission is required to use this app. About InstaSub In addition to our time tracking and employee scheduling solutions, InstaSub gives users the ability to offer a highly efficient way to manage absences for teachers. InstaSub continues to provide K-12 administrators with the functionality they need to ensure optimal staffing, centralized reporting, and automated notifications to streamline communication.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | ReadySub | InstaSub |
|---|---|---|
| Price | Free | Free |
| Rating | 2.0 (136 ratings) | 4.4 (241 ratings) — better |
| Positive reviews | 18.5% of reviews — better | 0.0% of reviews |
| Number of ratings | 136 | 241 — better |
| Update frequency | Every 5 months | Every 6 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 | 12.0 |
| Further details — not scored | ||
| Size | 9 MB | 24 MB |
| Age rating | 4+ | 4+ |
| Developer | Glass Arc LLC | Humanity.com, LLC |
Customer experience
ReadySub
InstaSub
Bugs and requests
ReadySub
Reported bugs
58 issues- 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
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- Does not function right, won't let you mark down days of absence
- Slow to load jobs
- No way to reject a job in the app
- Cannot set days you are not available in the app
- Login error
- Have not been able to log in for days
- Never been able to open or use app
- Doesn't even show the jobs you have
- Doesn't alert you that there are jobs available
- App is horrible, has NEVER worked
- Nothing is on this app
- App is useless because I receive notifications of available job through email only
- App is only available for use by subs
- App is useless, only shows available jobs
- Cannot view any assignments once accepted
- Cannot manage settings/preferences through the app
- Cannot view jobs they have already accepted
- Job may be listed as only one day when it covers several days
- Notes left by the teacher are cut off and cannot be expanded
- Signed me out and won't let me sign back in
- Does not let me do anything else other than see the jobs
- Chosen jobs were not saved somewhere on the app
- Doesn't do or show anything
- Cannot see the whole dashboard
- Cannot accept, review, cancel any job
- Cannot use calendar to mark unavailable dates
- No calendar to see my schedule
- App needs some serious updates
- Desktop app lacks the ability to block out periods of time all at once
- Cannot go back to see notes, start time or any details after hitting accept
- Notifications from the app don't work
- Cannot see what I’m booked for, where I’m going, or where I’ve been
- App is limited on what you can do
- Does not show available jobs
- The app does nothing
- No notifications when new jobs are posted
- Not receiving text messages for available jobs
- App has not functioned for several months
- Can’t see accepted jobs
- Cannot accept any jobs through the app
- Email and password not recognized
- App is only good for letting me know a job is available
- App doesn’t tell you anything except available jobs
- 99% of the time it doesn’t show available jobs
- No reason to have the app
- Only thing I can do is accept/check for new jobs
- Disappointed that is the only thing I can do
- Have to log onto the website to review booked jobs
- Not receiving one notification on iPhone or iPad
- Missing employment opportunities because of this
- App doesn’t work for me on my phone
- Others have said the same
- Have to open the internet browser on my phone just to accept any jobs
Requested features
15 requests- Filter selected schools and grade levels
- Send notifications when jobs are available
- Show calendar for accepted assignments
- Immediate text notifications
- View accepted jobs
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- Filter jobs by location
- Set preferences for job visibility
- Add accepted jobs tab
- Calendar feature
- Interface with Google Calendar
- Full website functionality in app
- Mark unavailable dates
- Block out periods of time at once
- See dashboard and calendar
- Teacher access to search/assign subs
InstaSub
Not enough reviews yet to summarise bugs or requests.
In-app purchases
ReadySub
No in-app purchases
InstaSub
No in-app purchases
