#1B577E
Closest named color: Deep Sea Blue (#015482). oklch(43.8% 0.088 241.8), rgb(27, 87, 126).
Aa
White text reads best on this color (7.74:1).
About this color
#1B577E is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.088 and its hue 242°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sea Blue (#015482), ΔE 0.017 away. White text reads best on it, at 7.74:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.088) |
| Temperature | cool |
| Nearest name | Deep Sea Blue (#015482) |
| Black text | 2.71:1 |
| White text | 7.74:1 |
Values
| HEX | #1B577E |
| RGB | rgb(27, 87, 126) |
| HSL | hsl(204, 65%, 30%) |
| OKLCH | oklch(43.8% 0.088 241.8) |
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 #1B577E | 7.74:1 | AAA | Lc -91.4 | Preferred for body text |
| Black text on #1B577E | 2.71:1 | Fails | Lc 17.4 | Dividers and decoration only |
| #1B577E text on white | 7.74:1 | AAA | Lc 86.6 | Fine for body text |
| #1B577E text on black | 2.71:1 | Fails | Lc -15.5 | 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E2EBF3
oklch(93.6% 0.015 244.7)
-
Step 200
200
#C9DCEB
oklch(88.5% 0.029 241.6)
-
Step 300
300
#A4C5DF
oklch(80.8% 0.051 242)
-
Step 400
400
#71A7D0
oklch(70.6% 0.083 242.1)
-
Step 500
500
#4991C3
oklch(63.2% 0.104 241.4)
-
Step 600
600
#267AB0
oklch(55.6% 0.115 241.9)
-
Step 700
700
#176797
oklch(49.2% 0.106 241.3)
-
Step 800
800 (this color)
#1B577E
oklch(43.8% 0.088 241.8)
-
Step 900
900
#1B4663
oklch(37.8% 0.069 241.4)
-
Step 950
950
#11293A
oklch(27% 0.044 241.7)
#1B577E 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) | #455880 | 0.043 |
| Deuteranopia (no green cones) | #374E7D | 0.034 |
| Tritanopia (no blue cones) | #006165 | 0.061 |
| Achromatopsia (no color) | #535353 | 0.088 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B577E
#1B577E
oklch(43.8% 0.088 241.8)
- #744516
#744516
oklch(43.7% 0.088 61.3)
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 #1B577E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sea Blue #015482 ΔE 0.017
- Light Navy Blue #2E5A88 ΔE 0.025
- Light Navy #155084 ΔE 0.026
- Dusk Blue #26538D ΔE 0.031
- YInMn Blue #415A77 ΔE 0.041
- Denim Blue #3B5B92 ΔE 0.047
- Petrol #005F6A ΔE 0.049
- Denim #3B638C ΔE 0.053
Use #1B577E 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.