#1D4B9D
Closest named color: Cobalt (#1E488F). oklch(43.1% 0.143 260.9), rgb(29, 75, 157).
Aa
White text reads best on this color (8.24:1).
About this color
#1D4B9D is a dark, vivid blue. In OKLCH its lightness is 43%, its chroma 0.143 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.024 away. White text reads best on it, at 8.24:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | vivid (0.143) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.54:1 |
| White text | 8.24:1 |
Values
| HEX | #1D4B9D |
| RGB | rgb(29, 75, 157) |
| HSL | hsl(218, 69%, 36%) |
| OKLCH | oklch(43.1% 0.143 260.9) |
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 #1D4B9D | 8.24:1 | AAA | Lc -92.7 | Preferred for body text |
| Black text on #1D4B9D | 2.54:1 | Fails | Lc 16.0 | Dividers and decoration only |
| #1D4B9D text on white | 8.24:1 | AAA | Lc 88.0 | Fine for body text |
| #1D4B9D text on black | 2.54:1 | Fails | Lc -14.1 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E1EAFB
oklch(93.5% 0.025 263.3)
-
Step 200
200
#C8DAF9
oklch(88.5% 0.047 261.4)
-
Step 300
300
#A2C2F7
oklch(80.9% 0.083 260.4)
-
Step 400
400
#70A0F3
oklch(70.7% 0.133 260.8)
-
Step 500
500
#4A85EF
oklch(63% 0.171 261.1)
-
Step 600
600
#2C6CDE
oklch(55.6% 0.186 260.9)
-
Step 700
700
#1F59C0
oklch(49% 0.173 261)
-
Step 800
800 (this color)
#1D4B9D
oklch(43.1% 0.143 260.9)
-
Step 900
900
#1C3F7C
oklch(37.8% 0.111 260.6)
-
Step 950
950
#112548
oklch(26.9% 0.07 260.7)
#1D4B9D 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) | #1455A0 | 0.027 |
| Deuteranopia (no green cones) | #00499B | 0.017 |
| Tritanopia (no blue cones) | #005F6C | 0.111 |
| Achromatopsia (no color) | #4F4F4F | 0.143 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1D4B9D
#1D4B9D
oklch(43.1% 0.143 260.9)
- #694A00
#694A00
oklch(43.2% 0.089 81)
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 #1D4B9D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.024
- Dusk Blue #26538D ΔE 0.038
- Light Navy #155084 ΔE 0.046
- Blueberry #464196 ΔE 0.051
- Sapphire #2138AB ΔE 0.052
- Deep Sea Blue #015482 ΔE 0.056
- Denim Blue #3B5B92 ΔE 0.062
- Light Navy Blue #2E5A88 ΔE 0.063
Use #1D4B9D 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.