18-0

17-0 (at 18-0.co) is a free pro football history game that runs in a web browser at 18-0.co. Each spin lands on a franchise and an era; you take exactly one player season from it, fill seven slots (a quarterback, two running backs, two receivers, a tight end and a team defense), and get a deterministic rating mapped to a 17-game record from 0-17 to 17-0. Every card is a real season from 1980 to 2025, rated against its own era, with 4,872 rated seasons across 218 franchise-era combinations built from nflverse data. The same roster always earns the same record, and ranked seasons are scored on the server. It is open source (MIT); a public TestFlight beta exists for iPhone and iPad, and no account is required to play.

Features

• Spin a franchise and an era, take one player season per spin, and fill seven slots
• 4,872 real seasons from 1980 to 2025, each rated against its own era
• Deterministic scoring: the same roster always earns the same 18-game record
• Perfection gates: an 18-0 season needs no weak slot, and the game names the blocker
• Modes: Scout (stats, no ratings), GM (names only), Rookie, and Gameday on real NFL gamedays
• Leaderboards scored on the server; runs using the three-finger-spin cheat are flagged and excluded
• Plays offline once installed, and no account is required

Questions

Is 17-0 at 18-0.co free?

Yes. It is free to play in a web browser at 18-0.co, and no account is required.

How does a game work?

Spin for a franchise and an era, take exactly one player from it, and repeat until seven slots are filled: a quarterback, two running backs, two receivers, a tight end and a team defense. The roster is rated and mapped to a 17-game record.

How often does someone go 17-0?

Measured against the real dataset over 400,000 games, 17-0 lands about once in 6,000 games and 16-1 about once in 49.

Are the players and stats real?

Yes. Every card is a real regular season from 1980 to 2025, built from nflverse data and licensed season tables, and rated against its own era. Franchises are named for the city they play in now.

Is there an iPhone app?

A public TestFlight beta for iPhone and iPad is linked from the project's README. On any device, the web version can be installed from the browser and plays offline.

Does 17-0 collect data or show ads?

No account is needed; signing in is optional so ranked seasons can follow you. The game uses PostHog product analytics, and the web build may show display ads on the results screen.

Made by Mutaaf Aziz. Source: github.com/mutaaf/18-0.

Also from the same collection: Chalk Talk, COLD GAS.