#2F3A66
Closest named color: Prussian Blue (#1D3557). oklch(36.1% 0.077 271.5), rgb(47, 58, 102).
Aa
White text reads best on this color (10.94:1).
About this color
#2F3A66 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.077 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.039 away. White text reads best on it, at 10.94:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.077) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.91:1 |
| White text | 10.94:1 |
Values
| HEX | #2F3A66 |
| RGB | rgb(47, 58, 102) |
| HSL | hsl(228, 37%, 29%) |
| OKLCH | oklch(36.1% 0.077 271.5) |
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 #2F3A66 | 10.94:1 | AAA | Lc -99.1 | Preferred for body text |
| Black text on #2F3A66 | 1.91:1 | Fails | Lc 8.7 | Not readable |
| #2F3A66 text on white | 10.94:1 | AAA | Lc 95.2 | Preferred for body text |
| #2F3A66 text on black | 1.91:1 | Fails | Lc -7.4 | 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E6E9F6
oklch(93.6% 0.018 275.6)
-
Step 200
200
#D1D8EF
oklch(88.4% 0.033 272.2)
-
Step 300
300
#B3BFE7
oklch(80.9% 0.058 272)
-
Step 400
400
#8C9DDB
oklch(70.7% 0.093 272.1)
-
Step 500
500
#7084D1
oklch(63.1% 0.118 271.6)
-
Step 600
600
#596CBE
oklch(55.5% 0.129 271.8)
-
Step 700
700
#495AA4
oklch(49.1% 0.12 271.6)
-
Step 800
800
#3C4A85
oklch(42.7% 0.099 271.6)
-
Step 900
900 (this color)
#2F3A66
oklch(36.1% 0.077 271.5)
-
Step 950
950
#1E253E
oklch(27.1% 0.048 271.1)
#2F3A66 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) | #283F68 | 0.016 |
| Deuteranopia (no green cones) | #233A65 | 0.016 |
| Tritanopia (no blue cones) | #17434B | 0.068 |
| Achromatopsia (no color) | #3C3C3C | 0.078 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2F3A66
#2F3A66
oklch(36.1% 0.077 271.5)
- #4C3B00
#4C3B00
oklch(36.1% 0.074 90.5)
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 #2F3A66, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.039
- Marine Blue #01386A ΔE 0.044
- Dark Grey Blue #29465B ΔE 0.047
- Twilight Blue #0A437A ΔE 0.047
- Dark Blue Grey #1F3B4D ΔE 0.051
- Charcoal #264653 ΔE 0.058
- Marine #042E60 ΔE 0.063
- Midnight Green #073B4C ΔE 0.064
Use #2F3A66 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.