What is challenge rating?

A rough guide to how dangerous a monster is for a party of four adventurers of that level. It is a design aid rather than a precise measure, and experienced tables treat it loosely.

Why do some monsters appear more than once in the source?

Because Open5e aggregates several open rules documents, and the same creature is reprinted across them. This saver deduplicates on name so the list reads as a bestiary rather than a catalogue of reprints.

Yes. It comes from Open5e, which serves the open-licensed D&D 5e reference documents. Nothing is invented or simulated, and if the source cannot be reached the saver reports that instead of drawing something plausible.

Does it cost anything or need an account?

No. Every screensaver here is free, runs in the browser and needs no sign-up. This one uses a public API that requires no key.

Does a higher challenge rating always mean more hit points?

Generally it trends that way, since the rating accounts for durability, but it also weighs damage output and special abilities, so two monsters of equal rating can have quite different hit point totals.

Why are some well-known monsters missing?

The SRD covers only part of the published monster material, and Open5e's own site notes that some content is missing because it was not included in the 5e SRD.

Can I use these rankings to balance an encounter?

They are a starting point. A challenge rating describes a single monster against a party of four whose level matches it, so more monsters or a different party size change the difficulty.

Monsters By Challenge Rating Screensaver

The Monsters By Challenge Rating screensaver ranks the D&D 5e SRD bestiary by challenge rating — the designers' estimate of how much trouble a monster is for a party of four — with hit points and armour class alongside. It runs in the browser with nothing to install; press ESC to exit.

How the Monsters By Challenge Rating screensaver works

The saver reads Open5e, which serves the open-licensed D&D 5e reference documents.

No account and no key: the request goes straight from your browser, or from this site's own refreshed copy of the feed where the source does not allow browser access.

Values are drawn on a canvas that resizes with the window, so it works on a laptop or a wall display.

If the source is unreachable the saver says so on screen rather than showing stale numbers as though they were current.

Challenge rating and the SRD bestiary

Challenge rating is a shorthand from Dungeons & Dragons fifth edition for how dangerous a monster is. The guidance in the Basic Rules is that a well-rested, well-equipped party of four characters whose level equals a monster’s rating should be able to defeat it without any deaths. Ratings begin with fractions (one-eighth, one-quarter, one-half) for weak creatures, then climb through whole numbers up to 30.

The list comes from the System Reference Document, the portion of the rules that Wizards of the Coast released for others to reuse: first under the Open Game License in 2016 and, for version 5.1, under Creative Commons CC-BY-4.0 from January 2023. Open5e is a site and API that serves the SRD and other open-licensed sources. Because the SRD is a subset of the published books, some famous creatures are absent from it.

Treat the numbers as design guidance, not guarantees. Hit points and armour class are only part of what makes a creature deadly; attack bonuses, damage per round, special abilities and the terrain count too. A group of lower-rated monsters can threaten a party that a single higher-rated creature would not.

A worked example

Each row names a monster with its size and type beneath, and its challenge rating and defensive statistics on the right. The scale is famously non-linear: the gap between CR 20 and CR 30 is far wider than the gap between CR 1 and CR 11, because the top of the table is where the setpiece monsters live. Duplicate reprints are filtered on name, or the tarrasque appears twice.

Settings & tips

Accent and Background recolour the display without changing the data.
Add it to a Multi-view grid to watch it alongside other live savers.
Press ESC at any time to leave fullscreen.

Frequently asked questions

What is challenge rating?: A rough guide to how dangerous a monster is for a party of four adventurers of that level. It is a design aid rather than a precise measure, and experienced tables treat it loosely.
Why do some monsters appear more than once in the source?: Because Open5e aggregates several open rules documents, and the same creature is reprinted across them. This saver deduplicates on name so the list reads as a bestiary rather than a catalogue of reprints.
Is this real data?: Yes. It comes from Open5e, which serves the open-licensed D&D 5e reference documents. Nothing is invented or simulated, and if the source cannot be reached the saver reports that instead of drawing something plausible.
Does it cost anything or need an account?: No. Every screensaver here is free, runs in the browser and needs no sign-up. This one uses a public API that requires no key.
Does a higher challenge rating always mean more hit points?: Generally it trends that way, since the rating accounts for durability, but it also weighs damage output and special abilities, so two monsters of equal rating can have quite different hit point totals.
Why are some well-known monsters missing?: The SRD covers only part of the published monster material, and Open5e's own site notes that some content is missing because it was not included in the 5e SRD.
Can I use these rankings to balance an encounter?: They are a starting point. A challenge rating describes a single monster against a party of four whose level matches it, so more monsters or a different party size change the difficulty.

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