In the Bag and Disc Library: How to Use Them

Two free tools, both private. Everything runs in your browser, nothing is uploaded, and there are no accounts. Your data lives in this browser's local storage.

In the Bag: find the gaps

Open In the Bag, search for a mold (or type custom flight numbers for a disc we don't list), and add everything you carry. The tool checks your bag against a simple checklist and tells you what's missing and what *kind* of disc would fix it. Tap Try an example bag to see a sample.

What it checks

- Speed classes. Putter (speed 1-3), midrange (4-5), fairway driver (6-8) and distance driver (9+). No putter or midrange is a big gap. No speed 9+ matters less for newer players, since slower discs often fly farther for developing arms. - Speed ladder. A jump of four or more speed points between neighbours (say 5 to 9) leaves a hole in the middle. - Stability within each class. Turn plus fade of -1 or lower is understable, 2 or higher is overstable, anything between is stable. For every class you carry, the tool looks for at least one overstable and one understable disc. - Shot shapes. Overstable fade, straight flyer, hyzer flip, turnover/anhyzer and roller. Each has a plain rule from the flight numbers, listed at the bottom of the tool. - Overlaps. Two discs in the same class with nearly identical numbers. Two copies of the same mold are called out as a backup, not a problem. Example molds for each gap come from our catalog, closest to the target flight numbers, one per brand. There are no affiliate links and no invented numbers. These are rules of thumb for a right-hand backhand thrower. Flight numbers are the manufacturer's stamp, not a measured throw, so treat the results as a shopping list for the mind, not a verdict. See flight numbers explained for what each number means.

The chart and sharing

Your whole bag is drawn on the same distance, turn and fade axes as the flight path chart, with a lefty/forehand flip. Share link puts the bag inside the URL itself, so a friend can open it without any server storing it.

Disc Library: for big collections

Open Disc Library if you own more discs than you can remember. Search the catalog to pre-fill the name and flight numbers, or type your own, then add plastic, weight, color, condition, notes and quantity. Tick in bag for the discs you carry. - Find things. Search, sort and filter by brand, speed class, stability, plastic, condition and in-bag. - See the pile. Totals plus breakdowns by brand, speed class, stability and plastic. - Back it up. Export CSV (opens in a spreadsheet) or JSON, and import either. Browser storage can be cleared by your browser or by you, so export a backup now and then. - Check your bag. The Check my bag for gaps button sends your in-bag discs to In the Bag. You can also pull discs from the library on that page. Disc data by Try Discs; mold list from the PDGA approved discs page.