Registration, payments, and rosters for youth and adult flag football leagues, all in one place.
Free forever for up to 3 teams. No credit card required.
Standing up new divisions and rosters every short season
Running youth sign-ups for parents and adult sign-ups for players with one tool
Splitting referee pay and field rental costs across teams
Ordering jerseys from sizes scattered across texts and forms
Everything you need to run your flag football program — from registration to game day.
Youth mode for divisions where parents register players. Adult mode for rec divisions where players register and pay for themselves. Both in one organization.
Collect the season fee at sign-up through Stripe, then invoice for jerseys, referee costs, or field rentals. Track who has paid from your dashboard.
Run youth age groups and adult divisions from one dashboard. Each division gets its own registration link and roster.
Give team captains a login scoped to their roster, and export any division to CSV for a field or schedule maker.
Flag football is the fastest-growing sport a rec organizer runs right now, and it grows in two directions at once. On one side are youth leagues packed with kids whose parents sign them up. On the other are adult divisions where coworkers and friends form teams and register themselves. A single organization often runs both, across multiple divisions and short seasons that turn over three or four times a year.
That pace is exactly what breaks a clipboard-and-spreadsheet setup. Every new season means new registrations, new jersey orders, new fees, and a fresh round of chasing people for money. The youth side needs a parent on every sign-up; the adult side needs players handling their own. Most organizers end up with a separate form, a separate chat, and a separate payment app for each.
Sideline handles both sides from one platform. Youth divisions run in youth mode so a parent registers each player, adult divisions run in adult mode so players register and pay for themselves, and every division you run sits on one dashboard instead of a patchwork you rebuild each season.
Flag football is one of the few sports where the same organization serves grade schoolers and grown adults, and Sideline supports both without a second tool. Youth mode keeps a parent or guardian on every registration, so the adult signing waivers and paying is always on record, and a family can register more than one player without starting over. Adult mode lets players register, pay, and sign for themselves with no parent or guardian step, which is exactly what a rec division of coworkers needs.
You choose the mode that fits each division. Your 8U and 10U youth teams run in youth mode with parents handling sign-up, while your Sunday adult league runs in adult mode with players registering themselves. Each division gets its own registration link, so a parent signing up a third grader only sees the youth team, and an adult joining the coed league only sees that division.
The form bends to what you need. Collect a jersey size for every player, a division or grade for youth, and a team or free-agent preference for adults, and add, remove, or reorder any field from your settings so the form asks for what your league needs and nothing more.
Flag football runs on short seasons and thin margins, and the costs are real: field or gym rentals, referee pay, and a jersey for every player. Sideline collects the per-season registration fee at sign-up through Stripe, so signing up and paying happen together, whether a parent is paying for a youth player or an adult is paying for themselves.
For everything else, send an invoice. Charge a whole team for its share of a field rental, collect a jersey order, or bill a one-off playoff or officiating fee, and players or parents pay online with a card, Apple Pay, or Google Pay. Your dashboard shows who has paid and who still owes on every charge, so you know a division is funded before you book the field and lock in the officials.
Money moves directly from the payer to your organization bank account through your connected Stripe account, and Sideline never holds your funds. Against TeamSnap at 3.25% plus $1.50 per transaction, Sideline keeps processing fees low, which matters when a season is short and the margin on a rec division is already tight.
Whether you run four youth age groups, two adult divisions, or all of them at once, Sideline manages every division from one dashboard. The moment you approve a registration, that player lands on the right team roster with their jersey size and payment status attached, so when the jersey order is due you have every size in one place instead of a stack of texts. Filter by division or team to see your whole organization at a glance, and export any roster to CSV when a field or a schedule maker needs it.
For leagues built around team captains, give each captain a login scoped to their team so they can see their roster and who has paid without touching the rest of the league, and for youth divisions each coach gets the same team-only access to their roster, calendar, and communications.
Put game and playoff dates on the calendar, and players or parents confirm from their phones so you know who is showing up before you set the schedule. When a game moves for weather, message the affected team or the whole division at once instead of a chain of texts. When the next season opens, players and families carry their history and waivers forward instead of registering from scratch, so a short season that turns over four times a year does not mean building everything new each time.
Yes. Sideline supports youth mode and adult mode in one organization. Run your youth age groups in youth mode so a parent registers each player, and run your adult divisions in adult mode so players register and pay for themselves. Every division is managed from the same dashboard.
Yes. In adult mode there is no parent or guardian step, so players enter their own details, sign your waiver, and pay from a phone in about five minutes. In youth mode a parent or guardian handles the sign-up and can register more than one player. You set the mode per division.
Yes. The per-season fee is collected at sign-up, and everything else runs through invoices. Charge a team for its share of a field rental, collect a jersey order, or bill a one-off playoff or officiating fee. Players or parents pay online through Stripe, and your dashboard tracks who has paid on each charge.
Yes. The registration form includes a jersey size field, and every size lands on the roster the moment you approve a registration, so the whole order is in one place when it is time to buy. You can add, remove, or reorder any field, including a grade for youth or a team preference for adults, from your settings.
Yes. Give each captain a login scoped to their team, so they can see their roster and who has paid without touching the rest of the league. Youth divisions get the same team-only access for coaches, and you can export any roster to CSV for a field or schedule maker.
For many leagues, yes. The free Starter plan includes 3 teams and up to 75 players with full online registration, payment collection, waivers, and roster management, and no credit card is required. When you outgrow it, the Club plan is $29/month for up to 15 teams and Pro is $79/month for up to 50 teams.
Related guide: Managing an Adult Rec League: Registration, Payments, and Scheduling
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