#1B4DA0
Closest named color: Cobalt (#1E488F). oklch(43.7% 0.145 260.1), rgb(27, 77, 160).
Aa
White text reads best on this color (8.02:1).
About this color
#1B4DA0 is a dark, vivid blue. In OKLCH its lightness is 44%, its chroma 0.145 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.030 away. White text reads best on it, at 8.02:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | vivid (0.145) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.61:1 |
| White text | 8.02:1 |
Values
| HEX | #1B4DA0 |
| RGB | rgb(27, 77, 160) |
| HSL | hsl(217, 71%, 37%) |
| OKLCH | oklch(43.7% 0.145 260.1) |
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 #1B4DA0 | 8.02:1 | AAA | Lc -92.0 | Preferred for body text |
| Black text on #1B4DA0 | 2.61:1 | Fails | Lc 16.7 | Dividers and decoration only |
| #1B4DA0 text on white | 8.02:1 | AAA | Lc 87.3 | Fine for body text |
| #1B4DA0 text on black | 2.61:1 | Fails | Lc -14.8 | 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
#E1EBFB
oklch(93.7% 0.024 259.8)
-
Step 200
200
#C7DAF9
oklch(88.4% 0.048 260.2)
-
Step 300
300
#A1C2F8
oklch(80.9% 0.085 260.1)
-
Step 400
400
#6DA0F5
oklch(70.7% 0.137 260.2)
-
Step 500
500
#4686F0
oklch(63.1% 0.172 259.9)
-
Step 600
600
#276CDF
oklch(55.5% 0.189 260.2)
-
Step 700
700
#1A5AC2
oklch(49.2% 0.175 260.1)
-
Step 800
800 (this color)
#1B4DA0
oklch(43.7% 0.145 260.1)
-
Step 900
900
#1A3F7C
oklch(37.7% 0.112 259.9)
-
Step 950
950
#102549
oklch(26.9% 0.072 260.4)
#1B4DA0 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) | #1657A3 | 0.027 |
| Deuteranopia (no green cones) | #004B9E | 0.015 |
| Tritanopia (no blue cones) | #00616F | 0.111 |
| Achromatopsia (no color) | #505050 | 0.145 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B4DA0
#1B4DA0
oklch(43.7% 0.145 260.1)
- #6C4B00
#6C4B00
oklch(43.8% 0.091 79.6)
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 #1B4DA0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.030
- Dusk Blue #26538D ΔE 0.039
- Light Navy #155084 ΔE 0.049
- Sapphire #2138AB ΔE 0.054
- Blueberry #464196 ΔE 0.054
- Deep Sea Blue #015482 ΔE 0.058
- Denim Blue #3B5B92 ΔE 0.060
- Light Navy Blue #2E5A88 ΔE 0.062
Use #1B4DA0 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.