#1584C6
Closest named color: Water Blue (#0E87CC). oklch(58.9% 0.135 242.7), rgb(21, 132, 198).
Aa
Black text reads best on this color (5.14:1).
About this color
#1584C6 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 59%, its chroma 0.135 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.011 away. Black text reads best on it, at 5.14:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.135) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.14:1 |
| White text | 4.07:1 |
Values
| HEX | #1584C6 |
| RGB | rgb(21, 132, 198) |
| HSL | hsl(202, 81%, 43%) |
| OKLCH | oklch(58.9% 0.135 242.7) |
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 #1584C6 | 4.07:1 | AA large text | Lc -72.9 | Content text, not long reading |
| Black text on #1584C6 | 5.14:1 | AA | Lc 36.6 | Non-text elements, placeholder text |
| #1584C6 text on white | 4.07:1 | AA large text | Lc 67.4 | Content text, not long reading |
| #1584C6 text on black | 5.14:1 | AA | Lc -34.2 | 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
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E0ECF5
oklch(93.7% 0.018 240)
-
Step 200
200
#C7DCEE
oklch(88.4% 0.034 244)
-
Step 300
300
#9FC6E5
oklch(80.9% 0.061 242.5)
-
Step 400
400
#68A8D9
oklch(70.8% 0.098 242.8)
-
Step 500
500
#3891CE
oklch(63.1% 0.124 242.6)
-
Step 600
600 (this color)
#1584C6
oklch(58.9% 0.135 242.7)
-
Step 700
700
#00669D
oklch(49% 0.118 242.7)
-
Step 800
800
#005482
oklch(42.8% 0.102 242.4)
-
Step 900
900
#0F4669
oklch(37.8% 0.081 242.3)
-
Step 950
950
#0C293D
oklch(27% 0.051 242.2)
#1584C6 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) | #6486C9 | 0.061 |
| Deuteranopia (no green cones) | #4C77C5 | 0.046 |
| Tritanopia (no blue cones) | #00949C | 0.091 |
| Achromatopsia (no color) | #7E7E7E | 0.135 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1584C6
#1584C6
oklch(58.9% 0.135 242.7)
- #B46800
#B46800
oklch(59% 0.135 62.9)
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 #1584C6, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.011
- Windows Blue #3778BF ΔE 0.034
- Cool Blue #4984B8 ΔE 0.036
- Steel Blue #4682B4 ΔE 0.037
- Blue NCS #118AB2 ΔE 0.039
- Nice Blue #107AB0 ΔE 0.041
- Off Blue #5684AE ΔE 0.055
- Flat Blue #3C73A8 ΔE 0.059
Use #1584C6 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.