#2D3F91
Closest named color: Cobalt (#1E488F). oklch(40.3% 0.137 269.9), rgb(45, 63, 145).
Aa
White text reads best on this color (9.41:1).
About this color
#2D3F91 is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.137 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.027 away. White text reads best on it, at 9.41:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.137) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.23:1 |
| White text | 9.41:1 |
Values
| HEX | #2D3F91 |
| RGB | rgb(45, 63, 145) |
| HSL | hsl(229, 53%, 37%) |
| OKLCH | oklch(40.3% 0.137 269.9) |
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 #2D3F91 | 9.41:1 | AAA | Lc -95.7 | Preferred for body text |
| Black text on #2D3F91 | 2.23:1 | Fails | Lc 12.6 | Not readable |
| #2D3F91 text on white | 9.41:1 | AAA | Lc 91.4 | Preferred for body text |
| #2D3F91 text on black | 2.23:1 | Fails | Lc -11.0 | 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 800.
-
Step 50
50
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E4EAFA
oklch(93.7% 0.023 269.4)
-
Step 200
200
#CDD8F7
oklch(88.4% 0.044 270)
-
Step 300
300
#ACBFF5
oklch(80.9% 0.079 269.5)
-
Step 400
400
#819CF0
oklch(70.7% 0.127 269.4)
-
Step 500
500
#6480EB
oklch(63% 0.163 270.1)
-
Step 600
600
#4C67DA
oklch(55.6% 0.178 269.8)
-
Step 700
700
#3E55BD
oklch(49.2% 0.165 269.9)
-
Step 800
800 (this color)
#2D3F91
oklch(40.3% 0.137 269.9)
-
Step 900
900
#2C3C79
oklch(37.7% 0.105 269.7)
-
Step 950
950
#1A2347
oklch(26.9% 0.068 270.7)
#2D3F91 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) | #004B94 | 0.039 |
| Deuteranopia (no green cones) | #00428F | 0.032 |
| Tritanopia (no blue cones) | #005361 | 0.113 |
| Achromatopsia (no color) | #464646 | 0.137 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2D3F91
#2D3F91
oklch(40.3% 0.137 269.9)
- #5A4600
#5A4600
oklch(40.4% 0.083 90)
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 #2D3F91, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.027
- Blueberry #464196 ΔE 0.038
- Dark Slate Blue #483D8B ΔE 0.040
- Sapphire #2138AB ΔE 0.048
- Twilight Blue #0A437A ΔE 0.051
- Light Navy #155084 ΔE 0.056
- Dusk Blue #26538D ΔE 0.056
- Deep Sea Blue #015482 ΔE 0.070
Use #2D3F91 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.