#1F2A7C
Closest named color: Midnight Blue (#191970). oklch(33.4% 0.138 270.8), rgb(31, 42, 124).
Aa
White text reads best on this color (12.49:1).
About this color
#1F2A7C is a dark, moderately saturated blue. In OKLCH its lightness is 33%, its chroma 0.138 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Midnight Blue (#191970), ΔE 0.047 away. White text reads best on it, at 12.49:1.
| Hue family | Blues |
| Lightness | dark (33%) |
| Chroma | moderately saturated (0.138) |
| Temperature | cool |
| Nearest name | Midnight Blue (#191970) |
| Black text | 1.68:1 |
| White text | 12.49:1 |
Values
| HEX | #1F2A7C |
| RGB | rgb(31, 42, 124) |
| HSL | hsl(233, 60%, 30%) |
| OKLCH | oklch(33.4% 0.138 270.8) |
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 #1F2A7C | 12.49:1 | AAA | Lc -101.3 | Preferred for body text |
| Black text on #1F2A7C | 1.68:1 | Fails | Lc 0.0 | Not readable |
| #1F2A7C text on white | 12.49:1 | AAA | Lc 97.8 | Preferred for body text |
| #1F2A7C text on black | 1.68:1 | Fails | Lc 0.0 | 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
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E2E9FF
oklch(93.5% 0.031 271.7)
-
Step 200
200
#CBD8FF
oklch(88.5% 0.056 270.7)
-
Step 300
300
#A9BEFF
oklch(80.9% 0.095 270.4)
-
Step 400
400
#7E99FF
oklch(70.7% 0.152 270.9)
-
Step 500
500
#5F7BFF
oklch(63.1% 0.198 270.7)
-
Step 600
600
#475CF7
oklch(55.7% 0.23 270.8)
-
Step 700
700
#3A4AD7
oklch(49.1% 0.214 270.9)
-
Step 800
800
#2F3EAE
oklch(42.7% 0.177 270.8)
-
Step 900
900 (this color)
#1F2A7C
oklch(33.4% 0.138 270.8)
-
Step 950
950
#172150
oklch(26.9% 0.087 270.5)
#1F2A7C 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) | #00387F | 0.038 |
| Deuteranopia (no green cones) | #002F7A | 0.026 |
| Tritanopia (no blue cones) | #003F4F | 0.109 |
| Achromatopsia (no color) | #343434 | 0.139 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F2A7C
#1F2A7C
oklch(33.4% 0.138 270.8)
- #443400
#443400
oklch(33.3% 0.068 89.7)
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 #1F2A7C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Midnight Blue #191970 ΔE 0.047
- Marine Blue #01386A ΔE 0.053
- Marine #042E60 ΔE 0.056
- Royal #0C1793 ΔE 0.057
- Twilight Blue #0A437A ΔE 0.067
- Prussian Blue #1D3557 ΔE 0.074
- Dark Blue #00008B ΔE 0.079
- Navy #000080 ΔE 0.083
Use #1F2A7C 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.