#1F3070
Closest named color: Marine Blue (#01386A). oklch(33.6% 0.113 268.4), rgb(31, 48, 112).
Aa
White text reads best on this color (12.24:1).
About this color
#1F3070 is a dark, moderately saturated blue. In OKLCH its lightness is 34%, its chroma 0.113 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.032 away. White text reads best on it, at 12.24:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | moderately saturated (0.113) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.71:1 |
| White text | 12.24:1 |
Values
| HEX | #1F3070 |
| RGB | rgb(31, 48, 112) |
| HSL | hsl(227, 57%, 28%) |
| OKLCH | oklch(33.6% 0.113 268.4) |
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 #1F3070 | 12.24:1 | AAA | Lc -101.1 | Preferred for body text |
| Black text on #1F3070 | 1.71:1 | Fails | Lc 0.0 | Not readable |
| #1F3070 text on white | 12.24:1 | AAA | Lc 97.6 | Preferred for body text |
| #1F3070 text on black | 1.71:1 | 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
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E3EAFB
oklch(93.7% 0.024 267.9)
-
Step 200
200
#CCD9F9
oklch(88.6% 0.046 267.9)
-
Step 300
300
#AABFF8
oklch(80.9% 0.084 268.8)
-
Step 400
400
#7D9CF5
oklch(70.7% 0.135 268.3)
-
Step 500
500
#5E80F1
oklch(63.1% 0.173 268.5)
-
Step 600
600
#4666DF
oklch(55.5% 0.188 268.4)
-
Step 700
700
#3854C2
oklch(49.1% 0.175 268.4)
-
Step 800
800
#2F469D
oklch(42.8% 0.144 268.5)
-
Step 900
900 (this color)
#1F3070
oklch(33.6% 0.113 268.4)
-
Step 950
950
#182349
oklch(26.9% 0.072 269)
#1F3070 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) | #003972 | 0.030 |
| Deuteranopia (no green cones) | #00326F | 0.024 |
| Tritanopia (no blue cones) | #003F4B | 0.090 |
| Achromatopsia (no color) | #353535 | 0.113 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F3070
#1F3070
oklch(33.6% 0.113 268.4)
- #453400
#453400
oklch(33.5% 0.068 88.4)
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 #1F3070, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.032
- Marine #042E60 ΔE 0.039
- Prussian Blue #1D3557 ΔE 0.049
- Twilight Blue #0A437A ΔE 0.055
- Midnight Blue #191970 ΔE 0.058
- Dark Blue Grey #1F3B4D ΔE 0.076
- Midnight Green #073B4C ΔE 0.080
- Royal #0C1793 ΔE 0.081
Use #1F3070 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.