#1D4B8F
Closest named color: Cobalt (#1E488F). oklch(42.1% 0.123 258.5), rgb(29, 75, 143).
Aa
White text reads best on this color (8.55:1).
About this color
#1D4B8F is a dark, moderately saturated blue. In OKLCH its lightness is 42%, its chroma 0.123 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.008 away. White text reads best on it, at 8.55:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.123) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.45:1 |
| White text | 8.55:1 |
Values
| HEX | #1D4B8F |
| RGB | rgb(29, 75, 143) |
| HSL | hsl(216, 66%, 34%) |
| OKLCH | oklch(42.1% 0.123 258.5) |
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 #1D4B8F | 8.55:1 | AAA | Lc -93.6 | Preferred for body text |
| Black text on #1D4B8F | 2.45:1 | Fails | Lc 15.0 | Not readable |
| #1D4B8F text on white | 8.55:1 | AAA | Lc 89.0 | Fine for body text |
| #1D4B8F text on black | 2.45:1 | Fails | Lc -13.2 | 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
#C9DAF4
oklch(88.4% 0.04 258.8)
-
Step 300
300
#A4C2F0
oklch(80.8% 0.073 258.8)
-
Step 400
400
#73A2E8
oklch(70.8% 0.115 258.1)
-
Step 500
500
#4E89E1
oklch(63.2% 0.147 258.2)
-
Step 600
600
#3170CF
oklch(55.5% 0.161 258.7)
-
Step 700
700
#235EB3
oklch(49.2% 0.148 258.2)
-
Step 800
800 (this color)
#1D4B8F
oklch(42.1% 0.123 258.5)
-
Step 900
900
#1F4174
oklch(37.8% 0.096 258.4)
-
Step 950
950
#132644
oklch(27% 0.061 259.2)
#1D4B8F 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) | #265292 | 0.023 |
| Deuteranopia (no green cones) | #08478E | 0.018 |
| Tritanopia (no blue cones) | #005B66 | 0.095 |
| Achromatopsia (no color) | #4C4C4C | 0.123 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1D4B8F
#1D4B8F
oklch(42.1% 0.123 258.5)
- #674600
#674600
oklch(42% 0.088 78)
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 #1D4B8F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.008
- Light Navy #155084 ΔE 0.026
- Dusk Blue #26538D ΔE 0.026
- Deep Sea Blue #015482 ΔE 0.038
- Twilight Blue #0A437A ΔE 0.044
- Light Navy Blue #2E5A88 ΔE 0.052
- Blueberry #464196 ΔE 0.054
- Denim Blue #3B5B92 ΔE 0.059
Use #1D4B8F 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.