#2F318A
Closest named color: Dark Slate Blue (#483D8B). oklch(37.1% 0.145 275.8), rgb(47, 49, 138).
Aa
White text reads best on this color (10.89:1).
About this color
#2F318A is a dark, vivid blue. In OKLCH its lightness is 37%, its chroma 0.145 and its hue 276°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.053 away. White text reads best on it, at 10.89:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | vivid (0.145) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 1.92:1 |
| White text | 10.89:1 |
Values
| HEX | #2F318A |
| RGB | rgb(47, 49, 138) |
| HSL | hsl(239, 49%, 36%) |
| OKLCH | oklch(37.1% 0.145 275.8) |
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 #2F318A | 10.89:1 | AAA | Lc -98.7 | Preferred for body text |
| Black text on #2F318A | 1.92:1 | Fails | Lc 9.2 | Not readable |
| #2F318A text on white | 10.89:1 | AAA | Lc 94.7 | Preferred for body text |
| #2F318A text on black | 1.92:1 | Fails | Lc -7.9 | 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
#F3F5FF
oklch(97.2% 0.013 277.1)
-
Step 100
100
#E4E9FF
oklch(93.7% 0.03 275.6)
-
Step 200
200
#CED7FF
oklch(88.5% 0.056 275.2)
-
Step 300
300
#AFBCFF
oklch(80.9% 0.096 275.6)
-
Step 400
400
#8796FF
oklch(70.7% 0.154 275.6)
-
Step 500
500
#6C77FF
oklch(63.2% 0.199 275.6)
-
Step 600
600
#5654FC
oklch(55.7% 0.241 275.7)
-
Step 700
700
#4742DB
oklch(49% 0.224 275.7)
-
Step 800
800
#3A38B1
oklch(42.7% 0.186 275.8)
-
Step 900
900 (this color)
#2F318A
oklch(37.1% 0.145 275.8)
-
Step 950
950
#1C1F52
oklch(27% 0.092 275.9)
#2F318A 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) | #00418D | 0.050 |
| Deuteranopia (no green cones) | #003988 | 0.042 |
| Tritanopia (no blue cones) | #004758 | 0.120 |
| Achromatopsia (no color) | #3D3D3D | 0.145 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2F318A
#2F318A
oklch(37.1% 0.145 275.8)
- #4C3F00
#4C3F00
oklch(37% 0.076 95.8)
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 #2F318A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.053
- Sapphire #2138AB ΔE 0.058
- Cobalt #1E488F ΔE 0.059
- Blueberry #464196 ΔE 0.060
- Twilight Blue #0A437A ΔE 0.062
- Marine Blue #01386A ΔE 0.073
- Indigo Blue #3A18B1 ΔE 0.073
- Royal #0C1793 ΔE 0.073
Use #2F318A 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.