#1B4C8E
Closest named color: Cobalt (#1E488F). oklch(42.2% 0.121 257.1), rgb(27, 76, 142).
Aa
White text reads best on this color (8.49:1).
About this color
#1B4C8E is a dark, moderately saturated blue. In OKLCH its lightness is 42%, its chroma 0.121 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.011 away. White text reads best on it, at 8.49:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.121) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.47:1 |
| White text | 8.49:1 |
Values
| HEX | #1B4C8E |
| RGB | rgb(27, 76, 142) |
| HSL | hsl(214, 68%, 33%) |
| OKLCH | oklch(42.2% 0.121 257.1) |
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 #1B4C8E | 8.49:1 | AAA | Lc -93.4 | Preferred for body text |
| Black text on #1B4C8E | 2.47:1 | Fails | Lc 15.1 | Dividers and decoration only |
| #1B4C8E text on white | 8.49:1 | AAA | Lc 88.8 | Fine for body text |
| #1B4C8E text on black | 2.47:1 | Fails | Lc -13.4 | Not readable |
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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E1EBF8
oklch(93.6% 0.021 254.9)
-
Step 200
200
#C9DBF4
oklch(88.6% 0.04 256.6)
-
Step 300
300
#A4C3EF
oklch(81% 0.071 257.1)
-
Step 400
400
#72A2E7
oklch(70.6% 0.114 257.4)
-
Step 500
500
#4C89DF
oklch(63% 0.145 257.3)
-
Step 600
600
#2E71CD
oklch(55.5% 0.158 257.4)
-
Step 700
700
#205FB2
oklch(49.2% 0.146 257)
-
Step 800
800 (this color)
#1B4C8E
oklch(42.2% 0.121 257.1)
-
Step 900
900
#1D4173
oklch(37.7% 0.095 257.2)
-
Step 950
950
#122643
oklch(26.9% 0.06 257.7)
#1B4C8E 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) | #295291 | 0.023 |
| Deuteranopia (no green cones) | #0E488D | 0.015 |
| Tritanopia (no blue cones) | #005C66 | 0.093 |
| Achromatopsia (no color) | #4D4D4D | 0.121 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B4C8E
#1B4C8E
oklch(42.2% 0.121 257.1)
- #684600
#684600
oklch(42.2% 0.088 77.2)
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 #1B4C8E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.011
- Light Navy #155084 ΔE 0.022
- Dusk Blue #26538D ΔE 0.024
- Deep Sea Blue #015482 ΔE 0.035
- Twilight Blue #0A437A ΔE 0.043
- Light Navy Blue #2E5A88 ΔE 0.050
- Blueberry #464196 ΔE 0.057
- Denim Blue #3B5B92 ΔE 0.058
Use #1B4C8E 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.