Free for instructors

When you can't teach,
someone you trust can.

The sub-coverage app for fitness instructors. Trusted circles only — no public marketplace, no randos, no midnight group-chat scramble.

Download on the App StoreiPhone · free · 30-sec setup
9:41

Dashboard

Hey Sarah.

Open in your groups

3
DR

HIIT 45

Pulse · Today 5:30pm

SOS
MT

Mat Pilates

Core · Sat 9:30am

$50
JL

Power Yoga

Phoenix · Sun 7am

$45
LP

Vinyasa

Bloom · Mon 6pm

$48
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The everyday chaos

Every instructor knows these.

It's 5am. You're sick. You teach at 6.

Sending a panic text into a 30-person group chat. Hoping someone wakes up. Watching your phone instead of resting.

Your sub showed up to a locked door.

Door code never made it. No music. No idea where the props are. Class started 8 minutes late.

Someone claimed it, then ghosted.

You assumed coverage was set. They didn't confirm day-of. Class started without a teacher. The studio lost a member.

Your sub poached your spot.

Studio liked them better. You weren't there to advocate. Now you're down a regular weekly class.

You forgot you agreed to cover.

Said yes in a text thread three weeks ago. It never made it to your calendar. Your name on the no-show list.

You teach at 4 studios.

Four different group chats. Four different vibes. Four different ways of asking for subs. Nothing in one place.

How it works

Three steps. Zero ambiguity.

1

Build the circle

Add the instructors you'd actually want covering your class.

Create a group for each studio you teach at. Invite the people you trust — by name, by reputation, by track record. Send the invite link via text. They tap, install, join. The circle is closed and stays that way.

9:41

Group

Phoenix Yoga

Yoga·8 members·Since Mar 2026

Trusted instructors

SM

Sarah Mendez

12 yrs · Insured

Owner
MT

Mike Tanaka

8 yrs · RYT-500

Admin
JL

Jess Liu

5 yrs · Insured

DR

Dana Reyes

3 yrs

LP

Liv Park

11 yrs · Veteran

2

Post the request

Tell them what your class actually needs.

Class time and pay, sure — but also the stuff that actually matters. Door code. Music notes. Regulars with special needs. Mat orientation. Expected attendance. Level. Your sub walks in already knowing the room.

9:41

Sub request

Vinyasa Flow · 6:00 PM

Tomorrow · Phoenix Yoga · 60 min · $45

Class handoff

Door code: 4-7-2-9 back entrance
Music: Spotify “sarah-flow”
Typical: 12-15 regulars, all levels
Heads up: Sarah is pregnant — sub child’s pose
Mats face: The windows
Auto-syncs to your Calendar on claim

Reversible for 60 seconds

3

Watch it claim itself

First trusted instructor to claim, wins.

Class auto-syncs to their Calendar with reminders at 24h, 4h, 1h, and 30min before. Day-of confirmation prompt 4 hours out. If no one's claimed and you're running out of time, tap SOS — every eligible instructor gets a priority alert immediately.

9:41

Claimed

Mike T. is covering.

Confirmed 2 min ago · Phoenix Yoga

On their calendar

24h beforeReminder
4h beforeConfirm cover
1h beforeDoor code + music
30 minFinal ping

SOS available

If no one claims in time, broadcast to everyone eligible instantly.

Sub gets an anti-poach reminder after class.
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Why it's free

The cost of bad coverage is way higher
than any subscription fee.

Every instructor we've talked to has a story about getting burned by no-show coverage, locked doors, or losing a class because a sub auditioned for it. ClassSub fixes those for free, forever. We'll eventually offer a paid Studio Plan for owners who want a dashboard. The instructor app stays free — that's the whole point.

What's in the box

Every feature is from a real instructor complaint.

Trusted circles

Sub requests only go to people you've added. No public marketplace.

Structured handoff

Door code, music, regulars notes, mat orientation, level. Your sub walks in knowing the room.

Anti-poaching

Reminder after every cover. Subbing isn't an audition.

Auto-calendar sync

Reminders at 24h, 4h, 1h, 30min.

SOS escalation

Hit SOS — everyone eligible gets a priority alert immediately.

Pass silently

Pass without notifying the poster.

Day-of confirmation

4hr before, your sub confirms. You stop checking your phone.

Priority recipients

Pick your favorites — they see requests first.

Multi-studio

Different group per studio. One inbox, one calendar.

FAQ

Questions instructors actually ask.

Is ClassSub really free?

Yes. ClassSub is free for instructors — the whole app. No paywalled features, no premium tier, no instructor surcharge.

How is this different from a public marketplace?

ClassSub is a closed, trusted-circle model. Your sub requests only ever go to people you've added to your group. There's no public discovery, no random instructors claiming your class, no scrolling through unknown profiles. You curate the circle once; the trust compounds.

Will my sub steal my job?

ClassSub bakes in an anti-poaching reminder. After every cover, the substitute sees a one-tap reminder that subbing your class isn't an audition. The studio relationship stays yours. We can't prevent every social dynamic, but we make the norm explicit.

What if I teach at multiple studios?

Most ClassSub users do. Create a separate group for each studio (or accept invites to your studios' existing groups). All your coverage flows through one app, one inbox, one calendar — across every studio you teach at.

Does ClassSub handle the money?

No. ClassSub tracks the agreed pay amount on each sub request so everyone's on the same page, but the actual payment happens between you and your sub directly (Venmo, Cash App, cash). We never touch your money.

How do invites work?

Group admins generate invite links and share them however they want — text, email, AirDrop, group chat. Recipients tap the link, install ClassSub, and join the group automatically. No friction, no manual approval queue.

What if no one claims my class?

If you're running out of time, tap SOS — it broadcasts the request to everyone eligible in your group immediately, bypassing the head-start window. Most last-minute coverage gets claimed within minutes.

What does ClassSub do that text threads don't?

Structured handoff (door code, music notes, regulars with special needs, expected attendance, level, mat orientation) so your sub walks in already knowing what to expect. Auto-calendar sync so they don't no-show. SOS escalation. Pass-silently for low-friction declining. Day-of confirmation so you actually know if the cover is happening. None of that fits in a group chat.

Is my data private?

Yes. We don't run ads, don't sell data, and never share your activity with anyone outside the groups you've joined. Read the full privacy policy at classsub.inpulsd.com/privacy.

Android version?

iOS only for now. If enough Android instructors ask, we'll prioritize it — email [email protected] to weigh in.

Your group, your coverage,
your peace of mind.

Free for instructors. iPhone. Takes 30 seconds to sign up.

Download on the App Store
Download on the App Store