Notation compared

What dice notation Korokoro reads, set beside what other dice rollers write. The list of modifiers and their order for RPG Dice Roller (@dice-roller/rpg-dice-roller) was checked against its documentation on 2026-09-30; it is the fullest notation in JavaScript, so it is the yardstick. A test reads this page: every notation in the Korokoro column of a row marked yes is rolled, and every one in a row marked not yet is refused, so the page cannot claim more than the package does.

Two things Korokoro adds to every row: exact odds for whatever it reads, and a refusal that names the part for whatever it does not. Nothing is quietly rolled as something else.

Dice

Feature	Korokoro	Status	Notes
A die of any size	d14, 2d3, d1000	yes	2 to 1000 sides
Percentile	d%, 1d100	yes
Fate or Fudge dice	4dF	yes	The standard die: two minus, two blank, two plus. RPG Dice Roller's dF.1 variant is not read
Several kinds in one roll	1d20+1d4+3	yes	Up to four kinds, ten dice
Custom faces	d[Yes,No,Maybe], 2d[Hit=1,Miss=0,Miss=0]	yes	Korokoro's own
Loaded dice, marked as loaded	d6{6:3}	yes	Korokoro's own
The whole roll several times	6#4d6dl1	yes	Korokoro's own spelling

Modifiers

Feature	Korokoro	Status	Notes
Keep highest or lowest	4d6kh3, 4d6k3, 2d20kl1	yes	k alone is kh
Drop lowest or highest	4d6dl1, 4d6d1, 5d10dh2	yes	d alone is dl
Best and worst	4d6b3, 2d20w1	yes	Aliases for kh and kl
Explode	3d6!	yes
Explode at a compare point	3d6!>=5, 3d6!=1, 3d6!<>6	yes	As in RPG Dice Roller, != here is "explode on", and "not" is <>
Compounding	3d6!!, 3d6!!>=5	yes
Penetrating	3d6!p, 3d6!!p	yes
Reroll until clear	2d6r, 2d6r<3, 2d6r=3, 2d6r>=5	yes	May match at most half the faces, and stops after 10
Reroll once	2d6ro, 2d6ro<3, 2d6ro=6, 2d6ro<>3	yes
Minimum and maximum	4d6min2, 4d6max5	yes
Count successes	6d10>=8, 6d10>7, 3d6=6, 4d6<3	yes
Failures that take a success away	6d10>=8f=1, 6d10>=8f<3	yes
Critical success and failure marks	1d20cs>=19, 1d20cf<3, 1d20cscf	yes	Marks only, as elsewhere
Sort	4d6s, 4d6sa, 4d6sd	yes	The roll keeps the order thrown; the dice are shown sorted
A label for the roll	2d6+3 # fire damage, [fire damage] 2d6+3	yes	One label for the roll
Unique dice	4d6u, 5d10usd	yes	Each die is thrown from the faces not yet showing: the same odds as rerolling duplicates until there are none
Reroll a duplicate once	4d6uo	not yet	Its odds are not quick to count exactly
Exploding dice kept or dropped	4d6!kh3	not yet	Tables disagree on whether an explosion is a new die in the pool; to be chosen
Successes among the dice kept	4d6kh3>=5	not yet

Arithmetic and groups

Feature	Korokoro	Status	Notes
A bonus	2d6+3, 4d8-1	yes	One whole number up to 99, added or taken away
Multiplying	2d6*2, 2d6x2, 1d4*1d6	yes
Dividing	floor(4d6/2), ceil(4d6/2), round(4d6/2)	yes	A division is always rounded: a roll comes to a whole number
A division left unrounded	4d6/2	not yet	Refused by name, with what to write. Other rollers give 6.5
Brackets	(2d6+3)*2, 1d20-(1d4+2)	yes
Dice taken away	1d20-1d4, -1d6+10	yes
Functions	floor(2d6/3), abs(1d6-1d6), max(1d6,1d8), min(1d6,1d8,4)	yes	floor, ceil, round, abs, max, min
Powers and roots	2d6^2, sqrt(2d6)	not yet
Grouped rolls, one kept	{4d6,3d8}kh1, {4d6,3d8}kl1	yes	Written back as max(…) and min(…)
Grouped rolls, several kept or counted	{4d6,3d8,2d10}kh2	not yet
Decimal numbers	2d6*1.5	not yet	Write floor(2d6*3/2)
More than ten dice	11d6	not yet	Ten in the tray and in typed notation. Code may ask for a hundred plain dice: parseNotation("40d6", { maxDice: 100 })

The order modifiers are applied in

Both rollers apply modifiers in a fixed order, whatever order they are written in. The orders differ in two places.

Step	Korokoro	RPG Dice Roller
1	Reroll	Min
2	Explode	Max
3	Min and max	Explode
4	Keep and drop	Reroll
5	Count successes and failures	Unique
6	Critical marks	Keep
7	Sort	Drop
8		Successes and failures
9		Critical success, then critical failure
10		Sort

• Reroll before explode. In Korokoro a die is rerolled first, and the face left standing is the one that may explode. It has done so since 1.2.0, and seeded rolls depend on it.
• Min and max after the explosion. In Korokoro a die explodes on the face it threw, and min and max then change what it counts for.

A roll that uses only one of these at a time comes out the same either way.

Other notations

• Roll20. r rerolls until clear and ro once, as Roll20 has them. Its grouped rolls that keep one roll are read; inline labels on each die are not.
• BCDice, which Japanese tables use, is a different notation with a command for each game system. It is a candidate for a later release, as a reader beside this one.
• A notation missing here? Open an issue with an example and what it should roll.