#1F4263
Closest named color: Dark Grey Blue (#29465B). oklch(37% 0.07 249), rgb(31, 66, 99).
Aa
White text reads best on this color (10.40:1).
About this color
#1F4263 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.070 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.024 away. White text reads best on it, at 10.40:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.070) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.01:1 |
| White text | 10.40:1 |
Values
| HEX | #1F4263 |
| RGB | rgb(31, 66, 99) |
| HSL | hsl(209, 52%, 25%) |
| OKLCH | oklch(37% 0.07 249) |
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 #1F4263 | 10.40:1 | AAA | Lc -98.0 | Preferred for body text |
| Black text on #1F4263 | 2.01:1 | Fails | Lc 10.0 | Not readable |
| #1F4263 text on white | 10.40:1 | AAA | Lc 94.0 | Preferred for body text |
| #1F4263 text on black | 2.01:1 | Fails | Lc -8.6 | 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 900.
-
Step 50
50
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E2EBF4
oklch(93.6% 0.016 248)
-
Step 200
200
#CBDBEC
oklch(88.5% 0.029 249.8)
-
Step 300
300
#A7C4E2
oklch(80.9% 0.053 249.4)
-
Step 400
400
#77A5D3
oklch(70.7% 0.084 249.1)
-
Step 500
500
#528EC8
oklch(63.1% 0.108 249.1)
-
Step 600
600
#3477B4
oklch(55.5% 0.117 248.9)
-
Step 700
700
#26649B
oklch(49.1% 0.109 248.8)
-
Step 800
800
#22527E
oklch(42.8% 0.09 249)
-
Step 900
900 (this color)
#1F4263
oklch(37% 0.07 249)
-
Step 950
950
#14283B
oklch(27% 0.044 248.6)
#1F4263 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) | #344364 | 0.026 |
| Deuteranopia (no green cones) | #2A3D62 | 0.018 |
| Tritanopia (no blue cones) | #004A4E | 0.055 |
| Achromatopsia (no color) | #404040 | 0.070 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F4263
#1F4263
oklch(37% 0.07 249)
- #57380F
#57380F
oklch(36.9% 0.07 69.4)
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 #1F4263, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.024
- Charcoal #264653 ΔE 0.035
- Twilight Blue #0A437A ΔE 0.040
- Dark Blue Grey #1F3B4D ΔE 0.040
- Prussian Blue #1D3557 ΔE 0.043
- Marine Blue #01386A ΔE 0.044
- Midnight Green #073B4C ΔE 0.049
- Dark Teal #014D4E ΔE 0.061
Use #1F4263 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.