#1F4978
Closest named color: Twilight Blue (#0A437A). oklch(40.1% 0.092 253.3), rgb(31, 73, 120).
Aa
White text reads best on this color (9.20:1).
About this color
#1F4978 is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.092 and its hue 253°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.025 away. White text reads best on it, at 9.20:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.092) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.28:1 |
| White text | 9.20:1 |
Values
| HEX | #1F4978 |
| RGB | rgb(31, 73, 120) |
| HSL | hsl(212, 59%, 30%) |
| OKLCH | oklch(40.1% 0.092 253.3) |
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 #1F4978 | 9.20:1 | AAA | Lc -95.3 | Preferred for body text |
| Black text on #1F4978 | 2.28:1 | Fails | Lc 13.0 | Not readable |
| #1F4978 text on white | 9.20:1 | AAA | Lc 90.9 | Preferred for body text |
| #1F4978 text on black | 2.28:1 | Fails | Lc -11.4 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E1EBF7
oklch(93.6% 0.019 252.9)
-
Step 200
200
#C8DBF3
oklch(88.5% 0.039 254.3)
-
Step 300
300
#A2C4ED
oklch(81% 0.069 253.4)
-
Step 400
400
#6EA4E4
oklch(70.7% 0.11 253.4)
-
Step 500
500
#448CDC
oklch(63.1% 0.141 253)
-
Step 600
600
#2174CA
oklch(55.6% 0.154 253.3)
-
Step 700
700
#1161AF
oklch(49.2% 0.143 253.2)
-
Step 800
800
#134F8D
oklch(42.6% 0.118 253.3)
-
Step 900
900 (this color)
#1F4978
oklch(40.1% 0.092 253.3)
-
Step 950
950
#102742
oklch(27% 0.058 253.9)
#1F4978 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) | #344C7A | 0.026 |
| Deuteranopia (no green cones) | #264477 | 0.015 |
| Tritanopia (no blue cones) | #00545A | 0.072 |
| Achromatopsia (no color) | #484848 | 0.092 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F4978
#1F4978
oklch(40.1% 0.092 253.3)
- #633F00
#633F00
oklch(40% 0.085 72.9)
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 #1F4978, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.025
- Light Navy #155084 ΔE 0.026
- Deep Sea Blue #015482 ΔE 0.034
- Cobalt #1E488F ΔE 0.039
- Dusk Blue #26538D ΔE 0.044
- Dark Grey Blue #29465B ΔE 0.049
- Light Navy Blue #2E5A88 ΔE 0.058
- Marine Blue #01386A ΔE 0.062
Use #1F4978 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.