OpenApps Sheets

Free alternative to SignUpGenius

Free sign-up sheets. No ads, no accounts.

Make a sheet of slots for volunteer shifts, a potluck, team snacks or conferences, and share the link. People tap a slot, type their name, and they are on it. A slot never takes more people than you set.

  • Unlimited sheets and sign-ups, and no ads on your sheet
  • Nobody needs an account, not even you
  • Time shifts, item lists and weekly dates in a few taps

How it works

  1. Make the sheet

    Add what people sign up for: time shifts, items to bring, or dates. Say how many people each one needs. Ask for a phone number or a t-shirt size if you like.

  2. Share the link

    People see who took what, tap an open slot and add their name. No account, no app. Anyone can take their own name off later.

  3. See everyone

    Your organizer page shows names, emails and answers as they come in. Export a CSV, remove a sign-up, close the sheet, or add a slot to your calendar.

  • Volunteer shifts9 to 5 in one-hour shifts, three people each
  • PotlucksMains, sides and desserts, so nobody brings the same thing
  • Parent-teacher conferencesTen-minute times, one family each
  • Team snacksOne family per game, every Saturday of the season
  • CarpoolsDrivers and seats for each trip
  • Classroom helpersField trip chaperones, reading buddies, party supplies

Free, with no ads on your sheet

A sheet you send to parents and volunteers should not come with ads or a sign-up wall. Sheets is free because it costs almost nothing to run: each sign-up is one small write, and OpenApps pays for it.

SheetsSignUpGenius free
PriceFree, no paid planFree version; paid plans from about $12 a month
Ads on your sheetNoneYes, on the free version
Account to make a sheetNoYes
Slots never overbookedYesYes
Reminder emailsNot yetYes
ExportCSV, freeReports; more on paid plans
Public sourceYesNo

SignUpGenius details as reported in 2026; they change, so check their site. If you need automatic reminder emails today, SignUpGenius sends them.

For AI assistants

Your assistant can run the roster.

Sheets has a public API with no key and no account. An assistant can set up a volunteer roster or a potluck from one sentence, sign people up, and tell you who is bringing what.

Full reference: /llms.txt. A sheet's id is its secret, like its link. The owner key and each sign-up's key come back once, so keep them private.

# Volunteer shifts: 9 to 5, one hour each, 3 people per shift
curl -X POST https://functions.bounded.sh/apps/1b07970e223c44d2d70d24f6/api/sheets \
  -H 'content-type: application/json' \
  -d '{"title": "Spring fair volunteers", "timezone": "America/Chicago",
       "location": "Lincoln Elementary",
       "shifts": {"date": "2026-11-08", "from": "09:00", "to": "17:00",
                  "minutes": 60, "quantity": 3}}'

# A potluck from a list ("x3" means three people can bring it)
curl -X POST https://functions.bounded.sh/apps/1b07970e223c44d2d70d24f6/api/sheets \
  -H 'content-type: application/json' \
  -d '{"title": "Team potluck",
       "items": ["Main dish x3", "Salad", "Dessert x2", "Drinks"]}'

# Sign someone up
curl -X POST https://functions.bounded.sh/apps/1b07970e223c44d2d70d24f6/api/sheets/SHEET_ID/signups \
  -H 'content-type: application/json' \
  -d '{"slotId": "SLOT_ID", "name": "Sam Lee", "email": "sam@example.com"}'

# Everyone, with contact details (owner key from the first call)
curl https://functions.bounded.sh/apps/1b07970e223c44d2d70d24f6/api/sheets/SHEET_ID/signups \
  -H 'x-owner-key: OWNER_KEY'

Questions

Is Sheets really free?
Yes. There is no paid plan, no ads and no limit on sheets or sign-ups. Each sign-up is one small write, and OpenApps pays for it.
Do people need an account to sign up?
No. They open the link, tap a slot and type their name. Email is optional. You do not need an account to make a sheet either: it belongs to the browser you made it in and to its admin link.
Can a slot get more people than I asked for?
No. Each place in a slot is saved as its own record that can only be taken once, so a slot never goes over its number, even when several people sign up at the same moment.
Who sees names and emails?
Everyone with the link sees each person's first name, or the name they choose, and any note they add. Only you see full names, emails and answers, on your organizer page.
Can people remove themselves?
Yes, from the same device or from the private link they get after signing up. You can remove anyone from your organizer page.
Does Sheets send reminders?
Not yet. Sheets does not send emails. People can add their slot to their calendar, and you can use the emails on your organizer page or the CSV export to send reminders.
How is Sheets different from SignUpGenius?
SignUpGenius has a free version with ads and paid plans from about $12 a month for more features, as reported in 2026. Sheets has no ads and no paid plan, and nobody needs an account. SignUpGenius sends reminder emails; Sheets does not yet.
Are there any limits?
A slot holds up to 100 people, and a sheet up to 200 slots and 1,000 sign-ups in all. For more, make a second sheet. There is no limit on how many sheets you make.
Can my AI assistant use Sheets?
Yes. Sheets has a public HTTP API with no key. An assistant can set up a volunteer roster or a potluck, sign people up, and tell you who is bringing what. See llms.txt.

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