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Free disc golf tools: JYLY and a bag builder that shows how your discs fly

Play 20 rounds at the basket, then see how your bag covers every shot. Both tools use the same logic as the apps, and neither needs an account.

Putting · Chains

Play JYLY

20 rounds, 5 putts from 5 to 10 m, up to 1,000 points. History, pace against your best, and a scorecard image at the end.

Play the game Bag · DiscScout

Build your bag

Search the catalogue, chart every disc's estimated flight at your arm speed, see gaps and near-identical flights.

Open the bag builder

Every tool

The rest of the kit

Scorecards you can print, a chart for a single disc or six side by side, and the catalogue behind the bag builder.

JYLY scorecardsBlank, guided and four-player cards to print or download as PDF.Open Flight chartOne disc at four arm speeds, or compare up to six before you buy.Open Disc catalogueFlight numbers by manufacturer, with the source for every record.Open

The apps

What the apps do that a browser can't

The tools here run in your browser. The apps add the wrist, DiscScout's GPS and the history that syncs.

DiscScout

Measure the throw, not just the disc

DiscScout turns your bag and your throws into a record you can act on.

  • Record throws from Apple Watch, with GPS averaged at each point.
  • Chart every disc at four arm speeds and four throws, with your own numbers.
  • See bag coverage and tap a gap to find a disc you already own.
  • Measure distance between two map points, with wind and elevation.
Download DiscScout on the App Store
DiscScout's bag flight chart on iPhone: every disc's estimated line at one arm speed

Chains

Every putt, counted

Chains logs practice and turns it into a make percentage you can trust.

  • One tap per make or miss, from any distance, in feet, metres or yards.
  • Four drills that resume where you left off.
  • JYLY from your wrist, with your best and your pace round by round.
  • Make rates from tap-ins to beyond Circle 2, and streaks over time.
Download Chains on the App Store
Chains' statistics screen on iPhone: make percentage by distance and a trend over time

Guides

The numbers, explained once

Short answers with the tool that demonstrates them.

Questions

The short answers

Is JYLY free to play here?

Yes. The game, the scorecards, the bag builder and the charts are free and need no account. JYLY was created by Markus Lindqvist; the original is at jyly.altervista.org.

Where are my bags and games saved?

In this browser only, on this device. Clearing site data removes them. The site counts anonymous actions to see which tools people use; the bags themselves never leave your device. The apps keep their own history on your iPhone and Apple Watch.

Are the flight charts accurate?

They are estimates from each disc's flight numbers and your arm speed, tuned to look like published charts. Plastic, wear, wind and release change the real flight. The app uses the same maths, so the two agree.

Which app should I get?

DiscScout measures throws from iPhone or Apple Watch, charts your bag and measures distance between two points on a map. Chains logs every putt, runs four drills on iPhone and plays JYLY from your wrist. Both are for iPhone and Apple Watch.

Do the tools work offline?

After one visit, yes. The site installs a service worker so the JYLY game and the bag builder open without a signal, which is the point at a basket or on a course.