#102F51
Closest named color: Prussian Blue (#1D3557). oklch(30.2% 0.072 253.1), rgb(16, 47, 81).
Aa
White text reads best on this color (13.57:1).
About this color
#102F51 is a dark, moderately saturated blue. In OKLCH its lightness is 30%, its chroma 0.072 and its hue 253°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.027 away. White text reads best on it, at 13.57:1.
| Hue family | Blues |
| Lightness | dark (30%) |
| Chroma | moderately saturated (0.072) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.54:1 |
| White text | 13.57:1 |
Values
| HEX | #102F51 |
| RGB | rgb(16, 47, 81) |
| HSL | hsl(211, 67%, 19%) |
| OKLCH | oklch(30.2% 0.072 253.1) |
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 #102F51 | 13.57:1 | AAA | Lc -103.0 | Preferred for body text |
| Black text on #102F51 | 1.54:1 | Fails | Lc 0.0 | Not readable |
| #102F51 text on white | 13.57:1 | AAA | Lc 99.8 | Preferred for body text |
| #102F51 text on black | 1.54:1 | 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 950.
-
Step 50
50
#F0F6FD
oklch(97.1% 0.011 252.1)
-
Step 100
100
#DFEBFA
oklch(93.6% 0.024 254)
-
Step 200
200
#C4DCF8
oklch(88.6% 0.047 252.4)
-
Step 300
300
#9AC4F7
oklch(80.9% 0.085 253.6)
-
Step 400
400
#5FA4F3
oklch(70.7% 0.136 253.1)
-
Step 500
500
#298AEE
oklch(63% 0.174 253.2)
-
Step 600
600
#0073D4
oklch(55.6% 0.172 253.1)
-
Step 700
700
#0060B3
oklch(49% 0.152 253.2)
-
Step 800
800
#004F94
oklch(42.8% 0.131 252.8)
-
Step 900
900
#04427B
oklch(37.8% 0.112 252.7)
-
Step 950
950 (this color)
#102F51
oklch(30.2% 0.072 253.1)
#102F51 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) | #1F3152 | 0.019 |
| Deuteranopia (no green cones) | #152B50 | 0.013 |
| Tritanopia (no blue cones) | #00373C | 0.054 |
| Achromatopsia (no color) | #2E2E2E | 0.072 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #102F51
#102F51
oklch(30.2% 0.072 253.1)
- #412800
#412800
oklch(30.1% 0.064 73.2)
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 #102F51, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.027
- Marine #042E60 ΔE 0.028
- Space Cadet #2B2D42 ΔE 0.042
- Midnight Green #073B4C ΔE 0.043
- Gunmetal #293241 ΔE 0.045
- Oxford Blue #1B263B ΔE 0.045
- Dark Blue Grey #1F3B4D ΔE 0.047
- Marine Blue #01386A ΔE 0.048
Use #102F51 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.