#1B435D
Closest named color: Dark Grey Blue (#29465B). oklch(36.7% 0.063 240.2), rgb(27, 67, 93).
Aa
White text reads best on this color (10.46:1).
About this color
#1B435D is a dark, muted blue. In OKLCH its lightness is 37%, its chroma 0.063 and its hue 240°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.019 away. White text reads best on it, at 10.46:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | muted (0.063) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.00:1 |
| White text | 10.46:1 |
Values
| HEX | #1B435D |
| RGB | rgb(27, 67, 93) |
| HSL | hsl(204, 55%, 24%) |
| OKLCH | oklch(36.7% 0.063 240.2) |
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 #1B435D | 10.46:1 | AAA | Lc -98.1 | Preferred for body text |
| Black text on #1B435D | 2.00:1 | Fails | Lc 9.8 | Not readable |
| #1B435D text on white | 10.46:1 | AAA | Lc 94.1 | Preferred for body text |
| #1B435D text on black | 2.00:1 | 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
#E2EBF2
oklch(93.5% 0.014 241)
-
Step 200
200
#CADCE9
oklch(88.5% 0.026 239.1)
-
Step 300
300
#A6C5DD
oklch(80.9% 0.048 241.5)
-
Step 400
400
#74A7CC
oklch(70.6% 0.077 240.7)
-
Step 500
500
#4D91BE
oklch(63.1% 0.097 239.8)
-
Step 600
600
#2D7AAB
oklch(55.5% 0.106 240.7)
-
Step 700
700
#1E6793
oklch(49.1% 0.099 240.3)
-
Step 800
800
#1C5477
oklch(42.7% 0.082 240.3)
-
Step 900
900 (this color)
#1B435D
oklch(36.7% 0.063 240.2)
-
Step 950
950
#132938
oklch(27% 0.04 240.2)
#1B435D 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) | #37435E | 0.033 |
| Deuteranopia (no green cones) | #2E3D5D | 0.027 |
| Tritanopia (no blue cones) | #00494C | 0.044 |
| Achromatopsia (no color) | #3F3F3F | 0.063 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B435D
#1B435D
oklch(36.7% 0.063 240.2)
- #573619
#573619
oklch(36.6% 0.064 60)
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 #1B435D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.019
- Charcoal #264653 ΔE 0.025
- Dark Blue Grey #1F3B4D ΔE 0.033
- Midnight Green #073B4C ΔE 0.041
- Prussian Blue #1D3557 ΔE 0.044
- Dark Teal #014D4E ΔE 0.050
- Marine Blue #01386A ΔE 0.050
- Twilight Blue #0A437A ΔE 0.051
Use #1B435D 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.