#2F3984
Closest named color: Dark Slate Blue (#483D8B). oklch(38.1% 0.125 273.2), rgb(47, 57, 132).
Aa
White text reads best on this color (10.29:1).
About this color
#2F3984 is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.125 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.043 away. White text reads best on it, at 10.29:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.125) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.03:1 |
| White text | 10.29:1 |
Values
| HEX | #2F3984 |
| RGB | rgb(47, 57, 132) |
| HSL | hsl(233, 47%, 35%) |
| OKLCH | oklch(38.1% 0.125 273.2) |
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 #2F3984 | 10.29:1 | AAA | Lc -97.7 | Preferred for body text |
| Black text on #2F3984 | 2.03:1 | Fails | Lc 10.3 | Not readable |
| #2F3984 text on white | 10.29:1 | AAA | Lc 93.6 | Preferred for body text |
| #2F3984 text on black | 2.03:1 | Fails | Lc -8.9 | 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
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E4E9FD
oklch(93.6% 0.028 274.7)
-
Step 200
200
#CDD8FD
oklch(88.6% 0.052 272.2)
-
Step 300
300
#ACBDFE
oklch(80.9% 0.094 272.8)
-
Step 400
400
#8398FD
oklch(70.8% 0.149 273.2)
-
Step 500
500
#677AFB
oklch(63.1% 0.191 273.3)
-
Step 600
600
#515FEA
oklch(55.6% 0.208 273.2)
-
Step 700
700
#424DCC
oklch(49.1% 0.194 273.1)
-
Step 800
800
#3640A5
oklch(42.7% 0.161 273.2)
-
Step 900
900 (this color)
#2F3984
oklch(38.1% 0.125 273.2)
-
Step 950
950
#1B214C
oklch(26.9% 0.079 273.9)
#2F3984 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) | #004487 | 0.042 |
| Deuteranopia (no green cones) | #003D82 | 0.039 |
| Tritanopia (no blue cones) | #004B58 | 0.107 |
| Achromatopsia (no color) | #404040 | 0.126 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2F3984
#2F3984
oklch(38.1% 0.125 273.2)
- #514100
#514100
oklch(38.1% 0.078 93)
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 #2F3984, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.043
- Cobalt #1E488F ΔE 0.043
- Twilight Blue #0A437A ΔE 0.045
- Blueberry #464196 ΔE 0.052
- Marine Blue #01386A ΔE 0.063
- Light Navy #155084 ΔE 0.066
- Sapphire #2138AB ΔE 0.066
- Dusk Blue #26538D ΔE 0.072
Use #2F3984 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.