#37358D
Closest named color: Dark Slate Blue (#483D8B). oklch(38.7% 0.142 278.5), rgb(55, 53, 141).
Aa
White text reads best on this color (10.21:1).
About this color
#37358D is a dark, vivid blue. In OKLCH its lightness is 39%, its chroma 0.142 and its hue 278°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.037 away. White text reads best on it, at 10.21:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | vivid (0.142) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.05:1 |
| White text | 10.21:1 |
Values
| HEX | #37358D |
| RGB | rgb(55, 53, 141) |
| HSL | hsl(241, 45%, 38%) |
| OKLCH | oklch(38.7% 0.142 278.5) |
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 #37358D | 10.21:1 | AAA | Lc -97.4 | Preferred for body text |
| Black text on #37358D | 2.05:1 | Fails | Lc 10.6 | Not readable |
| #37358D text on white | 10.21:1 | AAA | Lc 93.3 | Preferred for body text |
| #37358D text on black | 2.05:1 | Fails | Lc -9.2 | 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
#E5E8FF
oklch(93.6% 0.031 279.9)
-
Step 200
200
#D0D6FF
oklch(88.5% 0.057 278.6)
-
Step 300
300
#B2BBFF
oklch(81% 0.097 278.2)
-
Step 400
400
#8C94FF
oklch(70.7% 0.155 278.4)
-
Step 500
500
#7374FF
oklch(63.1% 0.202 278.6)
-
Step 600
600
#5E53F8
oklch(55.7% 0.236 278.4)
-
Step 700
700
#4E41D8
oklch(49.1% 0.22 278.4)
-
Step 800
800
#4037AE
oklch(42.6% 0.182 278.8)
-
Step 900
900 (this color)
#37358D
oklch(38.7% 0.142 278.5)
-
Step 950
950
#1E1E51
oklch(26.9% 0.091 278.4)
#37358D 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) | #004590 | 0.056 |
| Deuteranopia (no green cones) | #003D8B | 0.050 |
| Tritanopia (no blue cones) | #004B5B | 0.123 |
| Achromatopsia (no color) | #414141 | 0.142 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37358D
#37358D
oklch(38.7% 0.142 278.5)
- #4F4400
#4F4400
oklch(38.6% 0.08 98.7)
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 #37358D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.037
- Blueberry #464196 ΔE 0.043
- Cobalt #1E488F ΔE 0.053
- Sapphire #2138AB ΔE 0.056
- Twilight Blue #0A437A ΔE 0.065
- Indigo Blue #3A18B1 ΔE 0.073
- Imperial Purple #480CA8 ΔE 0.074
- Light Navy #155084 ΔE 0.079
Use #37358D 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.