#1B435E
Closest named color: Dark Grey Blue (#29465B). oklch(36.8% 0.065 241.2), rgb(27, 67, 94).
Aa
White text reads best on this color (10.44:1).
About this color
#1B435E is a dark, muted blue. In OKLCH its lightness is 37%, its chroma 0.065 and its hue 241°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.020 away. White text reads best on it, at 10.44:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | muted (0.065) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.01:1 |
| White text | 10.44:1 |
Values
| HEX | #1B435E |
| RGB | rgb(27, 67, 94) |
| HSL | hsl(204, 55%, 24%) |
| OKLCH | oklch(36.8% 0.065 241.2) |
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 #1B435E | 10.44:1 | AAA | Lc -98.1 | Preferred for body text |
| Black text on #1B435E | 2.01:1 | Fails | Lc 9.9 | Not readable |
| #1B435E text on white | 10.44:1 | AAA | Lc 94.0 | Preferred for body text |
| #1B435E text on black | 2.01:1 | Fails | Lc -8.5 | 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 900.
-
Step 50
50
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E2EBF3
oklch(93.6% 0.015 244.7)
-
Step 200
200
#CADCEA
oklch(88.5% 0.027 241.2)
-
Step 300
300
#A6C5DE
oklch(80.9% 0.049 242.6)
-
Step 400
400
#74A7CD
oklch(70.7% 0.078 241.4)
-
Step 500
500
#4D91C0
oklch(63.2% 0.099 240.9)
-
Step 600
600
#2D7AAC
oklch(55.6% 0.107 241.3)
-
Step 700
700
#1E6794
oklch(49.2% 0.1 240.9)
-
Step 800
800
#1C5478
oklch(42.7% 0.083 241.1)
-
Step 900
900 (this color)
#1B435E
oklch(36.8% 0.065 241.2)
-
Step 950
950
#122939
oklch(27% 0.042 241)
#1B435E 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) | #37435F | 0.033 |
| Deuteranopia (no green cones) | #2E3D5E | 0.026 |
| Tritanopia (no blue cones) | #004A4C | 0.047 |
| Achromatopsia (no color) | #404040 | 0.065 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B435E
#1B435E
oklch(36.8% 0.065 241.2)
- #583618
#583618
oklch(36.7% 0.065 59.9)
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 #1B435E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.020
- Charcoal #264653 ΔE 0.026
- Dark Blue Grey #1F3B4D ΔE 0.034
- Midnight Green #073B4C ΔE 0.042
- Prussian Blue #1D3557 ΔE 0.044
- Twilight Blue #0A437A ΔE 0.049
- Marine Blue #01386A ΔE 0.049
- Dark Teal #014D4E ΔE 0.051
Use #1B435E 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.