#3D4173
Closest named color: Dark Slate Blue (#483D8B). oklch(39.7% 0.084 278.4), rgb(61, 65, 115).
Aa
White text reads best on this color (9.53:1).
About this color
#3D4173 is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.084 and its hue 278°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.047 away. White text reads best on it, at 9.53:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.084) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.20:1 |
| White text | 9.53:1 |
Values
| HEX | #3D4173 |
| RGB | rgb(61, 65, 115) |
| HSL | hsl(236, 31%, 35%) |
| OKLCH | oklch(39.7% 0.084 278.4) |
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 #3D4173 | 9.53:1 | AAA | Lc -96.2 | Preferred for body text |
| Black text on #3D4173 | 2.20:1 | Fails | Lc 12.0 | Not readable |
| #3D4173 text on white | 9.53:1 | AAA | Lc 92.0 | Preferred for body text |
| #3D4173 text on black | 2.20:1 | Fails | Lc -10.4 | 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
#F4F5FB
oklch(97.1% 0.008 278.6)
-
Step 100
100
#E7E9F6
oklch(93.6% 0.018 279.1)
-
Step 200
200
#D3D7F1
oklch(88.4% 0.036 278.7)
-
Step 300
300
#B7BDEA
oklch(80.9% 0.064 278.9)
-
Step 400
400
#929ADF
oklch(70.7% 0.101 278.4)
-
Step 500
500
#7980D6
oklch(63.2% 0.129 278.5)
-
Step 600
600
#6268C3
oklch(55.7% 0.139 278)
-
Step 700
700
#5256A8
oklch(49.2% 0.129 278.4)
-
Step 800
800
#434688
oklch(42.6% 0.108 278.8)
-
Step 900
900 (this color)
#3D4173
oklch(39.7% 0.084 278.4)
-
Step 950
950
#212340
oklch(27% 0.054 279.2)
#3D4173 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) | #2E4875 | 0.026 |
| Deuteranopia (no green cones) | #2A4372 | 0.026 |
| Tritanopia (no blue cones) | #2B4B54 | 0.073 |
| Achromatopsia (no color) | #454545 | 0.084 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3D4173
#3D4173
oklch(39.7% 0.084 278.4)
- #524700
#524700
oklch(39.7% 0.082 99.1)
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 #3D4173, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.047
- Twilight Blue #0A437A ΔE 0.051
- Dark Grey Blue #29465B ΔE 0.056
- Cobalt #1E488F ΔE 0.057
- Light Navy #155084 ΔE 0.057
- Blueberry #464196 ΔE 0.061
- Dusk Blue #26538D ΔE 0.063
- Twilight #4E518B ΔE 0.064
Use #3D4173 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.