#1D4A8B
Closest named color: Cobalt (#1E488F). oklch(41.5% 0.119 258.1), rgb(29, 74, 139).
Aa
White text reads best on this color (8.73:1).
About this color
#1D4A8B is a dark, moderately saturated blue. In OKLCH its lightness is 42%, its chroma 0.119 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.009 away. White text reads best on it, at 8.73:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.119) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.40:1 |
| White text | 8.73:1 |
Values
| HEX | #1D4A8B |
| RGB | rgb(29, 74, 139) |
| HSL | hsl(215, 65%, 33%) |
| OKLCH | oklch(41.5% 0.119 258.1) |
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 #1D4A8B | 8.73:1 | AAA | Lc -94.1 | Preferred for body text |
| Black text on #1D4A8B | 2.40:1 | Fails | Lc 14.4 | Not readable |
| #1D4A8B text on white | 8.73:1 | AAA | Lc 89.5 | Fine for body text |
| #1D4A8B text on black | 2.40:1 | Fails | Lc -12.7 | 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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E2EBF8
oklch(93.7% 0.02 257.5)
-
Step 200
200
#CADAF3
oklch(88.4% 0.039 259.3)
-
Step 300
300
#A5C3EE
oklch(81% 0.069 257.4)
-
Step 400
400
#74A2E5
oklch(70.7% 0.111 257.7)
-
Step 500
500
#5089DE
oklch(63.1% 0.142 258.2)
-
Step 600
600
#3371CC
oklch(55.6% 0.155 258.2)
-
Step 700
700
#255EB0
oklch(49% 0.144 258.1)
-
Step 800
800 (this color)
#1D4A8B
oklch(41.5% 0.119 258.1)
-
Step 900
900
#204172
oklch(37.7% 0.093 258.2)
-
Step 950
950
#132643
oklch(26.9% 0.06 258.6)
#1D4A8B 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) | #28508D | 0.021 |
| Deuteranopia (no green cones) | #0F468A | 0.016 |
| Tritanopia (no blue cones) | #005963 | 0.092 |
| Achromatopsia (no color) | #4B4B4B | 0.119 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1D4A8B
#1D4A8B
oklch(41.5% 0.119 258.1)
- #654500
#654500
oklch(41.6% 0.086 78.5)
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 #1D4A8B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.009
- Light Navy #155084 ΔE 0.023
- Dusk Blue #26538D ΔE 0.029
- Deep Sea Blue #015482 ΔE 0.036
- Twilight Blue #0A437A ΔE 0.037
- Light Navy Blue #2E5A88 ΔE 0.053
- Blueberry #464196 ΔE 0.056
- Dark Slate Blue #483D8B ΔE 0.059
Use #1D4A8B 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.