#1F447B
Closest named color: Twilight Blue (#0A437A). oklch(39% 0.103 258.3), rgb(31, 68, 123).
Aa
White text reads best on this color (9.67:1).
About this color
#1F447B is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.103 and its hue 258°. 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 9.67:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.103) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.17:1 |
| White text | 9.67:1 |
Values
| HEX | #1F447B |
| RGB | rgb(31, 68, 123) |
| HSL | hsl(216, 60%, 30%) |
| OKLCH | oklch(39% 0.103 258.3) |
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 #1F447B | 9.67:1 | AAA | Lc -96.4 | Preferred for body text |
| Black text on #1F447B | 2.17:1 | Fails | Lc 11.8 | Not readable |
| #1F447B text on white | 9.67:1 | AAA | Lc 92.1 | Preferred for body text |
| #1F447B 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
#A2C3F3
oklch(81% 0.077 257.7)
-
Step 400
400
#70A2ED
oklch(70.8% 0.123 258.3)
-
Step 500
500
#4988E7
oklch(63.1% 0.158 258.5)
-
Step 600
600
#2970D5
oklch(55.7% 0.171 258.1)
-
Step 700
700
#1C5DB9
oklch(49.2% 0.159 258.3)
-
Step 800
800
#1A4C95
oklch(42.6% 0.131 258.4)
-
Step 900
900 (this color)
#1F447B
oklch(39% 0.103 258.3)
-
Step 950
950
#112646
oklch(27% 0.066 258.6)
#1F447B 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) | #29497D | 0.019 |
| Deuteranopia (no green cones) | #19417A | 0.011 |
| Tritanopia (no blue cones) | #005159 | 0.081 |
| Achromatopsia (no color) | #444444 | 0.103 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F447B
#1F447B
oklch(39% 0.103 258.3)
- #5C3F00
#5C3F00
oklch(39% 0.081 79.2)
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 #1F447B, 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 0.034
- Light Navy #155084 ΔE 0.036
- Deep Sea Blue #015482 ΔE 0.047
- Dusk Blue #26538D ΔE 0.051
- Marine Blue #01386A ΔE 0.052
- Dark Grey Blue #29465B ΔE 0.057
- Dark Slate Blue #483D8B ΔE 0.063
Use #1F447B 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.