#1F447C
Closest named color: Twilight Blue (#0A437A). oklch(39.1% 0.104 258.6), rgb(31, 68, 124).
Aa
White text reads best on this color (9.65:1).
About this color
#1F447C is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.104 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.015 away. White text reads best on it, at 9.65:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.104) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.17:1 |
| White text | 9.65:1 |
Values
| HEX | #1F447C |
| RGB | rgb(31, 68, 124) |
| HSL | hsl(216, 60%, 30%) |
| OKLCH | oklch(39.1% 0.104 258.6) |
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 #1F447C | 9.65:1 | AAA | Lc -96.3 | Preferred for body text |
| Black text on #1F447C | 2.17:1 | Fails | Lc 11.9 | Not readable |
| #1F447C text on white | 9.65:1 | AAA | Lc 92.1 | Preferred for body text |
| #1F447C text on black | 2.17:1 | Fails | Lc -10.3 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E1EBF9
oklch(93.7% 0.022 256.7)
-
Step 200
200
#C8DBF6
oklch(88.6% 0.043 257.1)
-
Step 300
300
#A2C2F3
oklch(80.8% 0.078 258.8)
-
Step 400
400
#6FA1EE
oklch(70.6% 0.126 258.8)
-
Step 500
500
#4888E8
oklch(63.1% 0.159 258.4)
-
Step 600
600
#296FD6
oklch(55.5% 0.173 258.6)
-
Step 700
700
#1C5CBA
oklch(49.1% 0.162 258.8)
-
Step 800
800
#194C96
oklch(42.7% 0.133 258.4)
-
Step 900
900 (this color)
#1F447C
oklch(39.1% 0.104 258.6)
-
Step 950
950
#112646
oklch(27% 0.066 258.6)
#1F447C 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) | #28497E | 0.019 |
| Deuteranopia (no green cones) | #17417B | 0.012 |
| Tritanopia (no blue cones) | #00515A | 0.081 |
| Achromatopsia (no color) | #454545 | 0.104 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F447C
#1F447C
oklch(39.1% 0.104 258.6)
- #5D3F00
#5D3F00
oklch(39.2% 0.082 78.3)
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 #1F447C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.015
- Cobalt #1E488F ΔE 0.032
- Light Navy #155084 ΔE 0.035
- Deep Sea Blue #015482 ΔE 0.047
- Dusk Blue #26538D ΔE 0.051
- Marine Blue #01386A ΔE 0.053
- Dark Grey Blue #29465B ΔE 0.059
- Dark Slate Blue #483D8B ΔE 0.062
Use #1F447C 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.