#2583AC
Closest named color: Blue NCS (#118AB2). oklch(57.5% 0.105 232.1), rgb(37, 131, 172).
Aa
Black text reads best on this color (4.92:1).
About this color
#2583AC is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.105 and its hue 232°. 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 4.92:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.105) |
| Temperature | cool |
| Nearest name | Blue NCS (#118AB2) |
| Black text | 4.92:1 |
| White text | 4.26:1 |
Values
| HEX | #2583AC |
| RGB | rgb(37, 131, 172) |
| HSL | hsl(198, 65%, 41%) |
| OKLCH | oklch(57.5% 0.105 232.1) |
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 #2583AC | 4.26:1 | AA large text | Lc -74.6 | Content text, not long reading |
| Black text on #2583AC | 4.92:1 | AA | Lc 35.0 | Non-text elements, placeholder text |
| #2583AC text on white | 4.26:1 | AA large text | Lc 69.1 | Content text, not long reading |
| #2583AC text on black | 4.92:1 | 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
#E1ECF2
oklch(93.7% 0.014 231.2)
-
Step 200
200
#C9DDE8
oklch(88.6% 0.026 231.7)
-
Step 300
300
#A3C7DA
oklch(81% 0.047 231.1)
-
Step 400
400
#6FA9C8
oklch(70.6% 0.076 232.7)
-
Step 500
500
#4493BA
oklch(63% 0.097 232.7)
-
Step 600
600 (this color)
#2583AC
oklch(57.5% 0.105 232.1)
-
Step 700
700
#0A698E
oklch(49% 0.097 232.3)
-
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
#102A37
oklch(27.1% 0.04 232.6)
#2583AC 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) | #6E82AE | 0.068 |
| Deuteranopia (no green cones) | #5C75AB | 0.057 |
| Tritanopia (no blue cones) | #008E91 | 0.062 |
| Achromatopsia (no color) | #7A7A7A | 0.105 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2583AC
#2583AC
oklch(57.5% 0.105 232.1)
- #A9663A
#A9663A
oklch(57.6% 0.105 52.5)
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 #2583AC, 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 0.028
- Teal Blue #01889F ΔE 0.031
- Nice Blue #107AB0 ΔE 0.031
- Cerulean #457B9D ΔE 0.032
- Cool Blue #4984B8 ΔE 0.034
- Stormy Blue #507B9C ΔE 0.039
- Off Blue #5684AE ΔE 0.040
Use #2583AC 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.