#2583AB
Closest named color: Blue NCS (#118AB2). oklch(57.5% 0.104 231.4), rgb(37, 131, 171).
Aa
Black text reads best on this color (4.91:1).
About this color
#2583AB is a medium-dark, moderately saturated blue. In OKLCH its lightness is 57%, its chroma 0.104 and its hue 231°. Its hue sits on the cool side of the wheel. The nearest named color is Blue NCS (#118AB2), ΔE 0.020 away. Black text reads best on it, at 4.91:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.104) |
| Temperature | cool |
| Nearest name | Blue NCS (#118AB2) |
| Black text | 4.91:1 |
| White text | 4.27:1 |
Values
| HEX | #2583AB |
| RGB | rgb(37, 131, 171) |
| HSL | hsl(198, 64%, 41%) |
| OKLCH | oklch(57.5% 0.104 231.4) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #2583AB | 4.27:1 | AA large text | Lc -74.7 | Content text, not long reading |
| Black text on #2583AB | 4.91:1 | AA | Lc 34.9 | Non-text elements, placeholder text |
| #2583AB text on white | 4.27:1 | AA large text | Lc 69.2 | Content text, not long reading |
| #2583AB text on black | 4.91:1 | AA | Lc -32.5 | Non-text elements, placeholder text |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 600.
-
Step 50
50
#F1F6F9
oklch(97% 0.007 233.6)
-
Step 100
100
#E1ECF1
oklch(93.6% 0.014 226.6)
-
Step 200
200
#C9DDE7
oklch(88.6% 0.025 229.2)
-
Step 300
300
#A3C7DA
oklch(81% 0.047 231.1)
-
Step 400
400
#6FA9C7
oklch(70.6% 0.075 231.8)
-
Step 500
500
#4494B9
oklch(63.2% 0.096 231)
-
Step 600
600 (this color)
#2583AB
oklch(57.5% 0.104 231.4)
-
Step 700
700
#0A6A8D
oklch(49.2% 0.096 230.6)
-
Step 800
800
#105673
oklch(42.7% 0.08 231.8)
-
Step 900
900
#18475D
oklch(37.7% 0.063 232.2)
-
Step 950
950
#102A36
oklch(27.1% 0.039 230.5)
#2583AB with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #6F81AD | 0.070 |
| Deuteranopia (no green cones) | #5D75AA | 0.058 |
| Tritanopia (no blue cones) | #008E90 | 0.062 |
| Achromatopsia (no color) | #7A7A7A | 0.104 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2583AB
#2583AB
oklch(57.5% 0.104 231.4)
- #A9663B
#A9663B
oklch(57.6% 0.104 52)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #2583AB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue NCS #118AB2 ΔE 0.020
- Steel Blue #4682B4 ΔE 0.029
- Teal Blue #01889F ΔE 0.029
- Cerulean #457B9D ΔE 0.032
- Nice Blue #107AB0 ΔE 0.032
- Cool Blue #4984B8 ΔE 0.035
- Stormy Blue #507B9C ΔE 0.039
- Off Blue #5684AE ΔE 0.040
Use #2583AB in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.