#1B587B
Closest named color: Deep Sea Blue (#015482). oklch(43.9% 0.084 238.5), rgb(27, 88, 123).
Aa
White text reads best on this color (7.69:1).
About this color
#1B587B is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.084 and its hue 239°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sea Blue (#015482), ΔE 0.023 away. White text reads best on it, at 7.69:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.084) |
| Temperature | cool |
| Nearest name | Deep Sea Blue (#015482) |
| Black text | 2.72:1 |
| White text | 7.69:1 |
Values
| HEX | #1B587B |
| RGB | rgb(27, 88, 123) |
| HSL | hsl(202, 64%, 29%) |
| OKLCH | oklch(43.9% 0.084 238.5) |
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 #1B587B | 7.69:1 | AAA | Lc -91.2 | Preferred for body text |
| Black text on #1B587B | 2.72:1 | Fails | Lc 17.6 | Dividers and decoration only |
| #1B587B text on white | 7.69:1 | AAA | Lc 86.4 | Fine for body text |
| #1B587B text on black | 2.72:1 | Fails | Lc -15.6 | 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 800.
-
Step 50
50
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E2EBF2
oklch(93.5% 0.014 241)
-
Step 200
200
#C9DCE9
oklch(88.4% 0.027 237.6)
-
Step 300
300
#A4C6DD
oklch(80.9% 0.049 237.8)
-
Step 400
400
#71A8CC
oklch(70.7% 0.078 238.1)
-
Step 500
500
#4992BF
oklch(63.2% 0.1 238.2)
-
Step 600
600
#257BAB
oklch(55.5% 0.109 238.3)
-
Step 700
700
#166893
oklch(49.2% 0.101 238)
-
Step 800
800 (this color)
#1B587B
oklch(43.9% 0.084 238.5)
-
Step 900
900
#1B4660
oklch(37.7% 0.065 238.5)
-
Step 950
950
#112938
oklch(26.9% 0.041 238.3)
#1B587B 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) | #47587D | 0.045 |
| Deuteranopia (no green cones) | #3A4F7A | 0.037 |
| Tritanopia (no blue cones) | #006164 | 0.056 |
| Achromatopsia (no color) | #535353 | 0.084 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B587B
#1B587B
oklch(43.9% 0.084 238.5)
- #74451D
#74451D
oklch(43.8% 0.084 58.1)
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 #1B587B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sea Blue #015482 ΔE 0.023
- Light Navy Blue #2E5A88 ΔE 0.028
- Light Navy #155084 ΔE 0.032
- Dusk Blue #26538D ΔE 0.038
- YInMn Blue #415A77 ΔE 0.038
- Petrol #005F6A ΔE 0.042
- Denim Blue #3B5B92 ΔE 0.051
- Denim #3B638C ΔE 0.053
Use #1B587B 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.