#1B4E90
Closest named color: Cobalt (#1E488F). oklch(42.8% 0.122 256.5), rgb(27, 78, 144).
Aa
White text reads best on this color (8.27:1).
About this color
#1B4E90 is a dark, moderately saturated blue. In OKLCH its lightness is 43%, its chroma 0.122 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.017 away. White text reads best on it, at 8.27:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.122) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.53:1 |
| White text | 8.27:1 |
Values
| HEX | #1B4E90 |
| RGB | rgb(27, 78, 144) |
| HSL | hsl(214, 68%, 34%) |
| OKLCH | oklch(42.8% 0.122 256.5) |
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 #1B4E90 | 8.27:1 | AAA | Lc -92.8 | Preferred for body text |
| Black text on #1B4E90 | 2.53:1 | Fails | Lc 15.8 | Dividers and decoration only |
| #1B4E90 text on white | 8.27:1 | AAA | Lc 88.2 | Fine for body text |
| #1B4E90 text on black | 2.53:1 | Fails | Lc -14.0 | 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
#A3C3EF
oklch(80.9% 0.072 256.4)
-
Step 400
400
#71A3E7
oklch(70.8% 0.114 256.3)
-
Step 500
500
#4A8ADF
oklch(63.1% 0.145 256.3)
-
Step 600
600
#2B72CD
oklch(55.6% 0.157 256.4)
-
Step 700
700
#1D5FB2
oklch(49.2% 0.147 256.5)
-
Step 800
800 (this color)
#1B4E90
oklch(42.8% 0.122 256.5)
-
Step 900
900
#1C4173
oklch(37.6% 0.096 256.8)
-
Step 950
950
#112743
oklch(27.1% 0.059 255.4)
#1B4E90 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) | #2C5493 | 0.025 |
| Deuteranopia (no green cones) | #12498F | 0.017 |
| Tritanopia (no blue cones) | #005E68 | 0.093 |
| Achromatopsia (no color) | #4E4E4E | 0.122 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B4E90
#1B4E90
oklch(42.8% 0.122 256.5)
- #6A4700
#6A4700
oklch(42.6% 0.089 76.7)
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 #1B4E90, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.017
- Dusk Blue #26538D ΔE 0.019
- Light Navy #155084 ΔE 0.022
- Deep Sea Blue #015482 ΔE 0.033
- Light Navy Blue #2E5A88 ΔE 0.045
- Twilight Blue #0A437A ΔE 0.049
- Denim Blue #3B5B92 ΔE 0.052
- Blueberry #464196 ΔE 0.057
Use #1B4E90 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.