#2588CA
Closest named color: Water Blue (#0E87CC). oklch(60.3% 0.133 243.6), rgb(37, 136, 202).
Aa
Black text reads best on this color (5.45:1).
About this color
#2588CA is a medium-dark, moderately saturated blue. In OKLCH its lightness is 60%, its chroma 0.133 and its hue 244°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.009 away. Black text reads best on it, at 5.45:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | moderately saturated (0.133) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.45:1 |
| White text | 3.85:1 |
Values
| HEX | #2588CA |
| RGB | rgb(37, 136, 202) |
| HSL | hsl(204, 69%, 47%) |
| OKLCH | oklch(60.3% 0.133 243.6) |
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 #2588CA | 3.85:1 | AA large text | Lc -71.1 | Content text, not long reading |
| Black text on #2588CA | 5.45:1 | AA | Lc 38.5 | Non-text elements, placeholder text |
| #2588CA text on white | 3.85:1 | AA large text | Lc 65.6 | Content text, not long reading |
| #2588CA text on black | 5.45:1 | AA | Lc -36.1 | 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 500.
-
Step 50
50
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E0ECF6
oklch(93.7% 0.019 243)
-
Step 200
200
#C6DCF0
oklch(88.4% 0.036 245.7)
-
Step 300
300
#9DC6E8
oklch(80.9% 0.065 243.7)
-
Step 400
400
#64A8DD
oklch(70.8% 0.104 243.5)
-
Step 500
500 (this color)
#2588CA
oklch(60.3% 0.133 243.6)
-
Step 600
600
#007ABC
oklch(55.7% 0.136 243.3)
-
Step 700
700
#00669F
oklch(49.1% 0.12 243.6)
-
Step 800
800
#005383
oklch(42.6% 0.105 243.8)
-
Step 900
900
#09456C
oklch(37.6% 0.087 244.2)
-
Step 950
950
#09293F
oklch(27% 0.055 243)
#2588CA 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) | #698ACD | 0.059 |
| Deuteranopia (no green cones) | #527BC9 | 0.045 |
| Tritanopia (no blue cones) | #0098A0 | 0.091 |
| Achromatopsia (no color) | #828282 | 0.133 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2588CA
#2588CA
oklch(60.3% 0.133 243.6)
- #B76D0E
#B76D0E
oklch(60.3% 0.133 63.9)
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 #2588CA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.009
- Cool Blue #4984B8 ΔE 0.033
- Steel Blue #4682B4 ΔE 0.037
- Blue NCS #118AB2 ΔE 0.041
- Windows Blue #3778BF ΔE 0.044
- Dark Sky Blue #448EE4 ΔE 0.048
- Off Blue #5684AE ΔE 0.052
- Nice Blue #107AB0 ΔE 0.054
Use #2588CA 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.