#373F98
Closest named color: Blueberry (#464196). oklch(41.5% 0.144 274.4), rgb(55, 63, 152).
Aa
White text reads best on this color (9.02:1).
About this color
#373F98 is a dark, vivid blue. In OKLCH its lightness is 41%, its chroma 0.144 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Blueberry (#464196), ΔE 0.024 away. White text reads best on it, at 9.02:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | vivid (0.144) |
| Temperature | cool |
| Nearest name | Blueberry (#464196) |
| Black text | 2.32:1 |
| White text | 9.02:1 |
Values
| HEX | #373F98 |
| RGB | rgb(55, 63, 152) |
| HSL | hsl(235, 47%, 41%) |
| OKLCH | oklch(41.5% 0.144 274.4) |
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 #373F98 | 9.02:1 | AAA | Lc -94.8 | Preferred for body text |
| Black text on #373F98 | 2.32:1 | Fails | Lc 13.6 | Not readable |
| #373F98 text on white | 9.02:1 | AAA | Lc 90.4 | Preferred for body text |
| #373F98 text on black | 2.32:1 | Fails | Lc -11.9 | 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
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E5E9FB
oklch(93.6% 0.025 275.9)
-
Step 200
200
#CFD8F9
oklch(88.6% 0.047 273.4)
-
Step 300
300
#B0BDF8
oklch(80.9% 0.085 274.7)
-
Step 400
400
#8899F4
oklch(70.8% 0.134 274.4)
-
Step 500
500
#6C7CF0
oklch(63.1% 0.173 274.4)
-
Step 600
600
#5662DE
oklch(55.6% 0.187 274.4)
-
Step 700
700
#4750C1
oklch(49.1% 0.174 274.5)
-
Step 800
800 (this color)
#373F98
oklch(41.5% 0.144 274.4)
-
Step 900
900
#31397C
oklch(37.6% 0.113 274.5)
-
Step 950
950
#1D2249
oklch(27% 0.072 275)
#373F98 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) | #004D9B | 0.049 |
| Deuteranopia (no green cones) | #004596 | 0.044 |
| Tritanopia (no blue cones) | #005465 | 0.121 |
| Achromatopsia (no color) | #494949 | 0.144 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #373F98
#373F98
oklch(41.5% 0.144 274.4)
- #5B4A00
#5B4A00
oklch(41.5% 0.085 93.8)
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 #373F98, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blueberry #464196 ΔE 0.024
- Dark Slate Blue #483D8B ΔE 0.033
- Cobalt #1E488F ΔE 0.037
- Sapphire #2138AB ΔE 0.045
- Dusk Blue #26538D ΔE 0.060
- Light Navy #155084 ΔE 0.066
- Twilight Blue #0A437A ΔE 0.068
- Twilight #4E518B ΔE 0.068
Use #373F98 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.