#1F3976
Closest named color: Twilight Blue (#0A437A). oklch(36.1% 0.109 264.3), rgb(31, 57, 118).
Aa
White text reads best on this color (11.02:1).
About this color
#1F3976 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.109 and its hue 264°. 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 11.02:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.109) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.90:1 |
| White text | 11.02:1 |
Values
| HEX | #1F3976 |
| RGB | rgb(31, 57, 118) |
| HSL | hsl(222, 58%, 29%) |
| OKLCH | oklch(36.1% 0.109 264.3) |
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 #1F3976 | 11.02:1 | AAA | Lc -99.0 | Preferred for body text |
| Black text on #1F3976 | 1.90:1 | Fails | Lc 8.7 | Not readable |
| #1F3976 text on white | 11.02:1 | AAA | Lc 95.2 | Preferred for body text |
| #1F3976 text on black | 1.90:1 | Fails | Lc -7.5 | 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 900.
-
Step 50
50
#F2F6FD
oklch(97.2% 0.01 261.8)
-
Step 100
100
#E2EAFA
oklch(93.6% 0.023 264.5)
-
Step 200
200
#CADAF8
oklch(88.6% 0.045 263.1)
-
Step 300
300
#A6C1F7
oklch(81% 0.082 264)
-
Step 400
400
#779EF2
oklch(70.6% 0.131 264.4)
-
Step 500
500
#5583EE
oklch(63% 0.168 264.6)
-
Step 600
600
#3B6ADC
oklch(55.6% 0.182 264.4)
-
Step 700
700
#2D58BF
oklch(49.1% 0.169 264.1)
-
Step 800
800
#26489B
oklch(42.6% 0.141 264.4)
-
Step 900
900 (this color)
#1F3976
oklch(36.1% 0.109 264.3)
-
Step 950
950
#152548
oklch(27.1% 0.069 263.9)
#1F3976 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) | #164078 | 0.020 |
| Deuteranopia (no green cones) | #003875 | 0.023 |
| Tritanopia (no blue cones) | #004752 | 0.087 |
| Achromatopsia (no color) | #3C3C3C | 0.110 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F3976
#1F3976
oklch(36.1% 0.109 264.3)
- #4F3900
#4F3900
oklch(36% 0.074 84.3)
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 #1F3976, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.030
- Marine Blue #01386A ΔE 0.032
- Prussian Blue #1D3557 ΔE 0.054
- Cobalt #1E488F ΔE 0.057
- Marine #042E60 ΔE 0.057
- Light Navy #155084 ΔE 0.068
- Dark Grey Blue #29465B ΔE 0.069
- Dark Slate Blue #483D8B ΔE 0.071
Use #1F3976 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.