#2D3F5B
Closest named color: Dark Grey Blue (#29465B). oklch(36.5% 0.054 259), rgb(45, 63, 91).
Aa
White text reads best on this color (10.64:1).
About this color
#2D3F5B is a dark, muted blue. In OKLCH its lightness is 37%, its chroma 0.054 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.023 away. White text reads best on it, at 10.64:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | muted (0.054) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 1.97:1 |
| White text | 10.64:1 |
Values
| HEX | #2D3F5B |
| RGB | rgb(45, 63, 91) |
| HSL | hsl(217, 34%, 27%) |
| OKLCH | oklch(36.5% 0.054 259) |
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 #2D3F5B | 10.64:1 | AAA | Lc -98.6 | Preferred for body text |
| Black text on #2D3F5B | 1.97:1 | Fails | Lc 9.3 | Not readable |
| #2D3F5B text on white | 10.64:1 | AAA | Lc 94.6 | Preferred for body text |
| #2D3F5B text on black | 1.97:1 | Fails | Lc -8.0 | 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 900.
-
Step 50
50
#F3F6F9
oklch(97.2% 0.005 247.9)
-
Step 100
100
#E5EAF2
oklch(93.6% 0.012 259.8)
-
Step 200
200
#D0DAE8
oklch(88.5% 0.022 256.7)
-
Step 300
300
#B1C2DB
oklch(80.9% 0.04 257.9)
-
Step 400
400
#88A2C9
oklch(70.7% 0.064 258.3)
-
Step 500
500
#6B8BBC
oklch(63.2% 0.083 258.7)
-
Step 600
600
#5374A8
oklch(55.6% 0.09 259.2)
-
Step 700
700
#436190
oklch(49.1% 0.084 259.1)
-
Step 800
800
#374F75
oklch(42.6% 0.07 259.3)
-
Step 900
900 (this color)
#2D3F5B
oklch(36.5% 0.054 259)
-
Step 950
950
#1C2737
oklch(27% 0.034 257.7)
#2D3F5B 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) | #34415C | 0.012 |
| Deuteranopia (no green cones) | #2F3C5A | 0.009 |
| Tritanopia (no blue cones) | #1A4549 | 0.048 |
| Achromatopsia (no color) | #3E3E3E | 0.054 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2D3F5B
#2D3F5B
oklch(36.5% 0.054 259)
- #4E3B1B
#4E3B1B
oklch(36.6% 0.054 78.8)
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 #2D3F5B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.023
- Charcoal #264653 ΔE 0.031
- Dark Blue Grey #1F3B4D ΔE 0.033
- Prussian Blue #1D3557 ΔE 0.040
- Onyx #343A40 ΔE 0.046
- Midnight Green #073B4C ΔE 0.049
- Charcoal Grey #3C4142 ΔE 0.050
- Marine Blue #01386A ΔE 0.055
Use #2D3F5B 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.