#2579AB
Closest named color: Nice Blue (#107AB0). oklch(55% 0.11 239.9), rgb(37, 121, 171).
Aa
White text reads best on this color (4.77:1).
About this color
#2579AB is a medium-dark, moderately saturated blue. In OKLCH its lightness is 55%, its chroma 0.110 and its hue 240°. Its hue sits on the cool side of the wheel. The nearest named color is Nice Blue (#107AB0), ΔE 0.010 away. White text reads best on it, at 4.77:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.110) |
| Temperature | cool |
| Nearest name | Nice Blue (#107AB0) |
| Black text | 4.40:1 |
| White text | 4.77:1 |
Values
| HEX | #2579AB |
| RGB | rgb(37, 121, 171) |
| HSL | hsl(202, 64%, 41%) |
| OKLCH | oklch(55% 0.11 239.9) |
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 #2579AB | 4.77:1 | AA | Lc -78.2 | Fine for body text |
| Black text on #2579AB | 4.40:1 | AA large text | Lc 31.3 | Non-text elements, placeholder text |
| #2579AB text on white | 4.77:1 | AA | Lc 72.8 | Content text, not long reading |
| #2579AB text on black | 4.40:1 | AA large text | Lc -28.9 | Dividers and decoration only |
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
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E2EBF3
oklch(93.6% 0.015 244.7)
-
Step 200
200
#CADCEA
oklch(88.5% 0.027 241.2)
-
Step 300
300
#A4C6DE
oklch(81% 0.05 239)
-
Step 400
400
#72A8CD
oklch(70.8% 0.079 239.3)
-
Step 500
500
#4A91C0
oklch(63.1% 0.101 240)
-
Step 600
600 (this color)
#2579AB
oklch(55% 0.11 239.9)
-
Step 700
700
#186794
oklch(49% 0.102 239.8)
-
Step 800
800
#185478
oklch(42.6% 0.084 240)
-
Step 900
900
#1B4661
oklch(37.7% 0.066 239.5)
-
Step 950
950
#112939
oklch(27% 0.042 240.1)
#2579AB 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) | #6179AD | 0.056 |
| Deuteranopia (no green cones) | #4F6DAA | 0.045 |
| Tritanopia (no blue cones) | #00868A | 0.075 |
| Achromatopsia (no color) | #737373 | 0.110 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2579AB
#2579AB
oklch(55% 0.11 239.9)
- #A06025
#A06025
oklch(55% 0.11 59.4)
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 #2579AB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Nice Blue #107AB0 ΔE 0.010
- Flat Blue #3C73A8 ΔE 0.021
- Muted Blue #3B719F ΔE 0.027
- Cerulean #457B9D ΔE 0.033
- Dull Blue #49759C ΔE 0.034
- Ocean Blue #03719C ΔE 0.035
- Windows Blue #3778BF ΔE 0.036
- Sea Blue #047495 ΔE 0.040
Use #2579AB 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.