GroupMe sprawl,
retired.
Comms is the coach-to-parent, coach-to-team, league-to-everyone messaging layer of SidelineOS. Targeted, archived, accountable — built for an operator who's tired of saying "what GroupMe is that in?"
New Message
EMAIL + SMS · 224 RECIPIENTSIf we make a weather call, you'll get an SMS by 6am. Don't drive to the field until you see that text. We won't send a 5:45 "still on" — we'll only message if it's off.
— Coach M · 10U STARS
Communication is where
programs lose parents.
Six GroupMes. One brain.
The coach has six GroupMes, an email inbox, and three SMS threads. Parents miss messages. Information drifts. Half the program is on "the old one."
"This isn't for you."
League-wide announcements go to everyone. Team-specific updates leak across teams. Targeting is "manual copy-paste" — until something important gets sent to the wrong group.
"I never got that."
When something matters — weather call, eligibility issue, refund request — "I didn't see it" is the parent's defense. Without an archive and read receipts, the program loses every time.
What Comms does.
League. Division.
Team. Position. One.
Audiences are built from Roster data — so when you write to "10U Parents," you're writing to exactly the 224 parents whose kids are registered, eligible, and on the 10U roster. Not a contact list from last season. Live.
- Audience builder powered by live Roster data
- Slice by division, team, position, eligibility status
- League-wide, division-wide, or team-only messaging
- Parent vs coach vs athlete recipient targeting
One message.
Both channels.
Write once. Comms delivers via email and SMS — formatted for each — and tracks delivery and read receipts across both. The operator stops translating their own thoughts between channels.
- Single composer → dual delivery (email + SMS)
- SMS auto-truncates with link to full message
- Read receipts across both channels
- Parent reply controls — turn on for soccer, off for league-wide
Every message,
searchable. Forever.
Templates for the recurring stuff — weather calls, schedule changes, welcome emails. Archive for the one-off stuff — disciplinary actions, eligibility questions, the parent who needs the receipt. Searchable by athlete, by division, by date.
- Template library with merge fields from Roster
- Full message history searchable by recipient or content
- Per-athlete communication log on the Roster profile
- Export for legal, board, or disciplinary review
Six modules. One operating system.
SidelineOS is modular. Start with what you need. Add the rest as we ship them. Your account scales, your data stays.
Locker
Track every piece of gear, tie it to an athlete, run check-in/check-out from your phone.
Roster
Registration, weight-tier eligibility, division placement, full athlete history across seasons.
Schedule
Field allocation, practice blocking, tournament brackets, and game-day scheduling.
Score
Field-number login, scoreboard sync, whistle and horn audio, halftime countdown, crash recovery.
Comms
Targeted messaging by team, division, or full league. Built for the operator tired of GroupMe sprawl.
Field
Field availability, conflict detection, weather cancellation flow, and facility partnership management.
Built in the field.
Not the office.
SidelineOS isn't a thesis. It's a tool I needed. I run a 1,340-athlete program across six divisions. Every module on this page started as a workflow I had to solve before Saturday. The fact that other operators need the same thing is the business — but the design pressure came from the field, not a focus group.
Numbers a competitor can't fake.
SidelineOS runs daily inside an active program. Here's what that program looks like.
Retire your GroupMes.
Join the Comms waitlist. 2027. Designed against 200+ real league communications drafted at NYF — weather calls, schedule changes, disciplinary actions, championship congratulations.