#1F4972
Closest named color: Twilight Blue (#0A437A). oklch(39.7% 0.084 250.3), rgb(31, 73, 114).
Aa
White text reads best on this color (9.31:1).
About this color
#1F4972 is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.084 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.030 away. White text reads best on it, at 9.31:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.084) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.25:1 |
| White text | 9.31:1 |
Values
| HEX | #1F4972 |
| RGB | rgb(31, 73, 114) |
| HSL | hsl(210, 57%, 28%) |
| OKLCH | oklch(39.7% 0.084 250.3) |
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 #1F4972 | 9.31:1 | AAA | Lc -95.6 | Preferred for body text |
| Black text on #1F4972 | 2.25:1 | Fails | Lc 12.7 | Not readable |
| #1F4972 text on white | 9.31:1 | AAA | Lc 91.3 | Preferred for body text |
| #1F4972 text on black | 2.25:1 | Fails | Lc -11.1 | 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
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E1EBF6
oklch(93.6% 0.018 250.6)
-
Step 200
200
#C8DBF0
oklch(88.4% 0.036 250.9)
-
Step 300
300
#A3C4E8
oklch(80.8% 0.062 250.8)
-
Step 400
400
#6FA5DD
oklch(70.7% 0.1 250.3)
-
Step 500
500
#468DD4
oklch(63% 0.129 250.6)
-
Step 600
600
#2376C1
oklch(55.6% 0.14 250.3)
-
Step 700
700
#1463A7
oklch(49.1% 0.13 250.3)
-
Step 800
800
#155187
oklch(42.7% 0.107 250.3)
-
Step 900
900 (this color)
#1F4972
oklch(39.7% 0.084 250.3)
-
Step 950
950
#10283F
oklch(27% 0.053 249.5)
#1F4972 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) | #374B74 | 0.028 |
| Deuteranopia (no green cones) | #2B4371 | 0.020 |
| Tritanopia (no blue cones) | #005358 | 0.064 |
| Achromatopsia (no color) | #474747 | 0.084 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F4972
#1F4972
oklch(39.7% 0.084 250.3)
- #633D03
#633D03
oklch(39.6% 0.084 69.6)
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 #1F4972, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.030
- Light Navy #155084 ΔE 0.033
- Deep Sea Blue #015482 ΔE 0.038
- Dark Grey Blue #29465B ΔE 0.039
- Cobalt #1E488F ΔE 0.050
- Dusk Blue #26538D ΔE 0.051
- Charcoal #264653 ΔE 0.052
- Marine Blue #01386A ΔE 0.060
Use #1F4972 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.