#2F388A
Closest named color: Dark Slate Blue (#483D8B). oklch(38.4% 0.135 273.5), rgb(47, 56, 138).
Aa
White text reads best on this color (10.22:1).
About this color
#2F388A is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.135 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 10.22:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.135) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.05:1 |
| White text | 10.22:1 |
Values
| HEX | #2F388A |
| RGB | rgb(47, 56, 138) |
| HSL | hsl(234, 49%, 36%) |
| OKLCH | oklch(38.4% 0.135 273.5) |
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 #2F388A | 10.22:1 | AAA | Lc -97.5 | Preferred for body text |
| Black text on #2F388A | 2.05:1 | Fails | Lc 10.6 | Not readable |
| #2F388A text on white | 10.22:1 | AAA | Lc 93.4 | Preferred for body text |
| #2F388A text on black | 2.05:1 | Fails | Lc -9.1 | 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
#E3E9FE
oklch(93.6% 0.029 273.1)
-
Step 200
200
#CDD7FF
oklch(88.4% 0.056 274.2)
-
Step 300
300
#ACBDFF
oklch(80.9% 0.095 273)
-
Step 400
400
#8397FF
oklch(70.7% 0.153 273.6)
-
Step 500
500
#6679FF
oklch(63.1% 0.198 273.3)
-
Step 600
600
#505AF4
oklch(55.6% 0.226 273.5)
-
Step 700
700
#4249D4
oklch(49.1% 0.209 273.5)
-
Step 800
800
#363DAC
oklch(42.8% 0.174 273.6)
-
Step 900
900 (this color)
#2F388A
oklch(38.4% 0.135 273.5)
-
Step 950
950
#1A204F
oklch(26.8% 0.086 273.7)
#2F388A 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) | #00458D | 0.044 |
| Deuteranopia (no green cones) | #003D88 | 0.038 |
| Tritanopia (no blue cones) | #004C5B | 0.113 |
| Achromatopsia (no color) | #414141 | 0.136 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2F388A
#2F388A
oklch(38.4% 0.135 273.5)
- #524200
#524200
oklch(38.5% 0.079 93.2)
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 #2F388A, 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
- Blueberry #464196 ΔE 0.048
- Twilight Blue #0A437A ΔE 0.051
- Sapphire #2138AB ΔE 0.056
- Light Navy #155084 ΔE 0.069
- Marine Blue #01386A ΔE 0.071
- Dusk Blue #26538D ΔE 0.073
Use #2F388A 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.