#1F4166
Closest named color: Dark Grey Blue (#29465B). oklch(36.9% 0.075 252.3), rgb(31, 65, 102).
Aa
White text reads best on this color (10.46:1).
About this color
#1F4166 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.075 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.030 away. White text reads best on it, at 10.46:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.075) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.00:1 |
| White text | 10.46:1 |
Values
| HEX | #1F4166 |
| RGB | rgb(31, 65, 102) |
| HSL | hsl(211, 53%, 26%) |
| OKLCH | oklch(36.9% 0.075 252.3) |
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 #1F4166 | 10.46:1 | AAA | Lc -98.1 | Preferred for body text |
| Black text on #1F4166 | 2.00:1 | Fails | Lc 9.8 | Not readable |
| #1F4166 text on white | 10.46:1 | AAA | Lc 94.1 | Preferred for body text |
| #1F4166 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E2EBF5
oklch(93.6% 0.017 250.8)
-
Step 200
200
#CBDBEE
oklch(88.5% 0.031 252.7)
-
Step 300
300
#A7C4E5
oklch(81% 0.056 251.8)
-
Step 400
400
#77A4D8
oklch(70.7% 0.091 252.6)
-
Step 500
500
#528DCD
oklch(63.1% 0.115 251.8)
-
Step 600
600
#3576BA
oklch(55.7% 0.125 251.9)
-
Step 700
700
#2763A1
oklch(49.2% 0.117 252)
-
Step 800
800
#225182
oklch(42.8% 0.096 251.9)
-
Step 900
900 (this color)
#1F4166
oklch(36.9% 0.075 252.3)
-
Step 950
950
#14283D
oklch(27.1% 0.047 251)
#1F4166 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) | #314368 | 0.023 |
| Deuteranopia (no green cones) | #273C65 | 0.016 |
| Tritanopia (no blue cones) | #004A4E | 0.061 |
| Achromatopsia (no color) | #3F3F3F | 0.075 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F4166
#1F4166
oklch(36.9% 0.075 252.3)
- #583805
#583805
oklch(37% 0.076 72)
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 #1F4166, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.030
- Twilight Blue #0A437A ΔE 0.035
- Marine Blue #01386A ΔE 0.039
- Charcoal #264653 ΔE 0.041
- Prussian Blue #1D3557 ΔE 0.043
- Dark Blue Grey #1F3B4D ΔE 0.044
- Midnight Green #073B4C ΔE 0.053
- Light Navy #155084 ΔE 0.061
Use #1F4166 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.