#1F448E
Closest named color: Cobalt (#1E488F). oklch(40.5% 0.13 262.3), rgb(31, 68, 142).
Aa
White text reads best on this color (9.22:1).
About this color
#1F448E is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.130 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.011 away. White text reads best on it, at 9.22:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.130) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.27:1 |
| White text | 9.22:1 |
Values
| HEX | #1F448E |
| RGB | rgb(31, 68, 142) |
| HSL | hsl(220, 64%, 34%) |
| OKLCH | oklch(40.5% 0.13 262.3) |
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 #1F448E | 9.22:1 | AAA | Lc -95.2 | Preferred for body text |
| Black text on #1F448E | 2.27:1 | Fails | Lc 13.1 | Not readable |
| #1F448E text on white | 9.22:1 | AAA | Lc 90.9 | Preferred for body text |
| #1F448E text on black | 2.27:1 | Fails | Lc -11.5 | 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 800.
-
Step 50
50
#F2F6FD
oklch(97.2% 0.01 261.8)
-
Step 100
100
#E2EAF9
oklch(93.5% 0.022 263.2)
-
Step 200
200
#CADAF6
oklch(88.5% 0.042 261.7)
-
Step 300
300
#A6C1F3
oklch(80.8% 0.077 262.6)
-
Step 400
400
#77A0EC
oklch(70.8% 0.121 262.1)
-
Step 500
500
#5486E7
oklch(63.2% 0.156 262.3)
-
Step 600
600
#396DD5
oklch(55.6% 0.17 262.3)
-
Step 700
700
#2C5BB8
oklch(49.2% 0.156 262.2)
-
Step 800
800 (this color)
#1F448E
oklch(40.5% 0.13 262.3)
-
Step 900
900
#223F77
oklch(37.7% 0.102 262.1)
-
Step 950
950
#152546
oklch(27% 0.065 263.2)
#1F448E 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) | #154D91 | 0.025 |
| Deuteranopia (no green cones) | #00438D | 0.018 |
| Tritanopia (no blue cones) | #005662 | 0.103 |
| Achromatopsia (no color) | #474747 | 0.130 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F448E
#1F448E
oklch(40.5% 0.13 262.3)
- #5F4400
#5F4400
oklch(40.6% 0.083 82.8)
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 #1F448E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.011
- Twilight Blue #0A437A ΔE 0.038
- Light Navy #155084 ΔE 0.040
- Dusk Blue #26538D ΔE 0.045
- Blueberry #464196 ΔE 0.051
- Dark Slate Blue #483D8B ΔE 0.054
- Deep Sea Blue #015482 ΔE 0.054
- Sapphire #2138AB ΔE 0.056
Use #1F448E 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.