#1B5984
Closest named color: Light Navy Blue (#2E5A88). oklch(44.7% 0.094 243.6), rgb(27, 89, 132).
Aa
White text reads best on this color (7.47:1).
About this color
#1B5984 is a dark, moderately saturated blue. In OKLCH its lightness is 45%, its chroma 0.094 and its hue 244°. Its hue sits on the cool side of the wheel. The nearest named color is Light Navy Blue (#2E5A88), ΔE 0.017 away. White text reads best on it, at 7.47:1.
| Hue family | Blues |
| Lightness | dark (45%) |
| Chroma | moderately saturated (0.094) |
| Temperature | cool |
| Nearest name | Light Navy Blue (#2E5A88) |
| Black text | 2.80:1 |
| White text | 7.47:1 |
Values
| HEX | #1B5984 |
| RGB | rgb(27, 89, 132) |
| HSL | hsl(205, 66%, 31%) |
| OKLCH | oklch(44.7% 0.094 243.6) |
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 #1B5984 | 7.47:1 | AAA | Lc -90.5 | Preferred for body text |
| Black text on #1B5984 | 2.80:1 | Fails | Lc 18.4 | Dividers and decoration only |
| #1B5984 text on white | 7.47:1 | AAA | Lc 85.7 | Fine for body text |
| #1B5984 text on black | 2.80:1 | Fails | Lc -16.4 | 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
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#E1EBF4
oklch(93.5% 0.016 245.1)
-
Step 200
200
#C9DCEC
oklch(88.5% 0.03 243.4)
-
Step 300
300
#A3C5E2
oklch(80.8% 0.055 244.3)
-
Step 400
400
#6FA7D3
oklch(70.7% 0.087 243.1)
-
Step 500
500
#4690C8
oklch(63.1% 0.112 243.9)
-
Step 600
600
#2179B5
oklch(55.5% 0.123 244)
-
Step 700
700
#11669B
oklch(49.1% 0.113 243.3)
-
Step 800
800 (this color)
#1B5984
oklch(44.7% 0.094 243.6)
-
Step 900
900
#194565
oklch(37.6% 0.073 243.7)
-
Step 950
950
#10293B
oklch(27.1% 0.046 242.4)
#1B5984 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) | #455A86 | 0.042 |
| Deuteranopia (no green cones) | #365083 | 0.033 |
| Tritanopia (no blue cones) | #006468 | 0.067 |
| Achromatopsia (no color) | #555555 | 0.094 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B5984
#1B5984
oklch(44.7% 0.094 243.6)
- #78470F
#78470F
oklch(44.6% 0.094 63.2)
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 #1B5984, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Light Navy Blue #2E5A88 ΔE 0.017
- Deep Sea Blue #015482 ΔE 0.021
- Dusk Blue #26538D ΔE 0.026
- Light Navy #155084 ΔE 0.029
- Denim Blue #3B5B92 ΔE 0.039
- YInMn Blue #415A77 ΔE 0.041
- Peacock Blue #016795 ΔE 0.044
- Denim #3B638C ΔE 0.045
Use #1B5984 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.