#2D3F83
Closest named color: Cobalt (#1E488F). oklch(39.2% 0.116 269.3), rgb(45, 63, 131).
Aa
White text reads best on this color (9.76:1).
About this color
#2D3F83 is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.116 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.031 away. White text reads best on it, at 9.76:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.116) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.15:1 |
| White text | 9.76:1 |
Values
| HEX | #2D3F83 |
| RGB | rgb(45, 63, 131) |
| HSL | hsl(227, 49%, 35%) |
| OKLCH | oklch(39.2% 0.116 269.3) |
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 #2D3F83 | 9.76:1 | AAA | Lc -96.6 | Preferred for body text |
| Black text on #2D3F83 | 2.15:1 | Fails | Lc 11.6 | Not readable |
| #2D3F83 text on white | 9.76:1 | AAA | Lc 92.4 | Preferred for body text |
| #2D3F83 text on black | 2.15:1 | Fails | Lc -10.1 | 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
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E3EAFB
oklch(93.7% 0.024 267.9)
-
Step 200
200
#CCD8FA
oklch(88.4% 0.049 270)
-
Step 300
300
#AABFFA
oklch(81% 0.087 269.2)
-
Step 400
400
#7E9BF7
oklch(70.7% 0.139 269.4)
-
Step 500
500
#5F7FF4
oklch(63.1% 0.178 269.3)
-
Step 600
600
#4865E3
oklch(55.7% 0.194 269.3)
-
Step 700
700
#3A53C5
oklch(49.2% 0.18 269.3)
-
Step 800
800
#2F449F
oklch(42.6% 0.15 269.2)
-
Step 900
900 (this color)
#2D3F83
oklch(39.2% 0.116 269.3)
-
Step 950
950
#18234A
oklch(27% 0.074 269.2)
#2D3F83 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) | #194885 | 0.029 |
| Deuteranopia (no green cones) | #024082 | 0.033 |
| Tritanopia (no blue cones) | #004F5B | 0.098 |
| Achromatopsia (no color) | #444444 | 0.116 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2D3F83
#2D3F83
oklch(39.2% 0.116 269.3)
- #574300
#574300
oklch(39.3% 0.08 89.3)
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 #2D3F83, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.031
- Twilight Blue #0A437A ΔE 0.035
- Dark Slate Blue #483D8B ΔE 0.043
- Blueberry #464196 ΔE 0.049
- Light Navy #155084 ΔE 0.050
- Dusk Blue #26538D ΔE 0.056
- Marine Blue #01386A ΔE 0.063
- Deep Sea Blue #015482 ΔE 0.063
Use #2D3F83 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.