#1F4577
Closest named color: Twilight Blue (#0A437A). oklch(39% 0.096 256.3), rgb(31, 69, 119).
Aa
White text reads best on this color (9.65:1).
About this color
#1F4577 is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.096 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.017 away. White text reads best on it, at 9.65:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.096) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.17:1 |
| White text | 9.65:1 |
Values
| HEX | #1F4577 |
| RGB | rgb(31, 69, 119) |
| HSL | hsl(214, 59%, 29%) |
| OKLCH | oklch(39% 0.096 256.3) |
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 #1F4577 | 9.65:1 | AAA | Lc -96.3 | Preferred for body text |
| Black text on #1F4577 | 2.17:1 | Fails | Lc 11.9 | Not readable |
| #1F4577 text on white | 9.65:1 | AAA | Lc 92.1 | Preferred for body text |
| #1F4577 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E1EBF8
oklch(93.6% 0.021 254.9)
-
Step 200
200
#C9DBF4
oklch(88.6% 0.04 256.6)
-
Step 300
300
#A3C3EF
oklch(80.9% 0.072 256.4)
-
Step 400
400
#70A3E7
oklch(70.8% 0.114 255.9)
-
Step 500
500
#498AE0
oklch(63.1% 0.146 256.2)
-
Step 600
600
#2972CE
oklch(55.6% 0.159 256.2)
-
Step 700
700
#1B5FB2
oklch(49.1% 0.148 256.1)
-
Step 800
800
#194E90
oklch(42.7% 0.122 256.1)
-
Step 900
900 (this color)
#1F4577
oklch(39% 0.096 256.3)
-
Step 950
950
#112743
oklch(27.1% 0.059 255.4)
#1F4577 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) | #2E4979 | 0.022 |
| Deuteranopia (no green cones) | #204176 | 0.012 |
| Tritanopia (no blue cones) | #005158 | 0.075 |
| Achromatopsia (no color) | #454545 | 0.096 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F4577
#1F4577
oklch(39% 0.096 256.3)
- #5E3E00
#5E3E00
oklch(39.1% 0.082 76)
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 #1F4577, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.017
- Light Navy #155084 ΔE 0.036
- Cobalt #1E488F ΔE 0.040
- Deep Sea Blue #015482 ΔE 0.045
- Dark Grey Blue #29465B ΔE 0.050
- Marine Blue #01386A ΔE 0.051
- Dusk Blue #26538D ΔE 0.053
- Charcoal #264653 ΔE 0.063
Use #1F4577 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.