#1B4699
Closest named color: Cobalt (#1E488F). oklch(41.6% 0.144 261.8), rgb(27, 70, 153).
Aa
White text reads best on this color (8.81:1).
About this color
#1B4699 is a dark, vivid blue. In OKLCH its lightness is 42%, its chroma 0.144 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.018 away. White text reads best on it, at 8.81:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | vivid (0.144) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.38:1 |
| White text | 8.81:1 |
Values
| HEX | #1B4699 |
| RGB | rgb(27, 70, 153) |
| HSL | hsl(220, 70%, 35%) |
| OKLCH | oklch(41.6% 0.144 261.8) |
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 #1B4699 | 8.81:1 | AAA | Lc -94.1 | Preferred for body text |
| Black text on #1B4699 | 2.38:1 | Fails | Lc 14.3 | Not readable |
| #1B4699 text on white | 8.81:1 | AAA | Lc 89.6 | Fine for body text |
| #1B4699 text on black | 2.38:1 | Fails | Lc -12.6 | 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
#A3C1F8
oklch(80.8% 0.085 262.3)
-
Step 400
400
#719FF4
oklch(70.6% 0.135 261.9)
-
Step 500
500
#4C85F0
oklch(63.2% 0.172 261.7)
-
Step 600
600
#2F6BDF
oklch(55.5% 0.188 261.8)
-
Step 700
700
#2259C1
oklch(49.1% 0.173 261.6)
-
Step 800
800 (this color)
#1B4699
oklch(41.6% 0.144 261.8)
-
Step 900
900
#1E3E7C
oklch(37.7% 0.112 262)
-
Step 950
950
#122549
oklch(27% 0.071 261.9)
#1B4699 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) | #03509C | 0.027 |
| Deuteranopia (no green cones) | #004597 | 0.015 |
| Tritanopia (no blue cones) | #005A68 | 0.111 |
| Achromatopsia (no color) | #4A4A4A | 0.144 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B4699
#1B4699
oklch(41.6% 0.144 261.8)
- #634600
#634600
oklch(41.5% 0.086 81.5)
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 #1B4699, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.018
- Sapphire #2138AB ΔE 0.044
- Dusk Blue #26538D ΔE 0.046
- Light Navy #155084 ΔE 0.048
- Blueberry #464196 ΔE 0.051
- Twilight Blue #0A437A ΔE 0.054
- Deep Sea Blue #015482 ΔE 0.060
- Dark Slate Blue #483D8B ΔE 0.060
Use #1B4699 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.