#233571
Closest named color: Marine Blue (#01386A). oklch(35% 0.106 268), rgb(35, 53, 113).
Aa
White text reads best on this color (11.54:1).
About this color
#233571 is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.106 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.030 away. White text reads best on it, at 11.54:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.106) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.81:1 |
| White text | 11.54:1 |
Values
| HEX | #233571 |
| RGB | rgb(35, 53, 113) |
| HSL | hsl(226, 53%, 29%) |
| OKLCH | oklch(35% 0.106 268) |
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 #233571 | 11.54:1 | AAA | Lc -100.0 | Preferred for body text |
| Black text on #233571 | 1.81:1 | Fails | Lc 7.6 | Not readable |
| #233571 text on white | 11.54:1 | AAA | Lc 96.3 | Preferred for body text |
| #233571 text on black | 1.81:1 | Fails | Lc 0.0 | 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
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E3EAFA
oklch(93.6% 0.023 266.9)
-
Step 200
200
#CCD9F7
oklch(88.5% 0.044 266.9)
-
Step 300
300
#AABFF5
oklch(80.8% 0.08 268.1)
-
Step 400
400
#7E9DF0
oklch(70.7% 0.127 267.6)
-
Step 500
500
#5F82EB
oklch(63.2% 0.162 267.7)
-
Step 600
600
#4868D9
oklch(55.5% 0.177 268.2)
-
Step 700
700
#3956BC
oklch(49% 0.164 267.9)
-
Step 800
800
#2F4798
oklch(42.6% 0.136 267.8)
-
Step 900
900 (this color)
#233571
oklch(35% 0.106 268)
-
Step 950
950
#182447
oklch(27% 0.067 267.5)
#233571 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) | #123D73 | 0.025 |
| Deuteranopia (no green cones) | #003670 | 0.027 |
| Tritanopia (no blue cones) | #00434D | 0.089 |
| Achromatopsia (no color) | #393939 | 0.106 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #233571
#233571
oklch(35% 0.106 268)
- #4A3800
#4A3800
oklch(35.1% 0.072 88.5)
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 #233571, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.030
- Twilight Blue #0A437A ΔE 0.042
- Prussian Blue #1D3557 ΔE 0.047
- Marine #042E60 ΔE 0.048
- Cobalt #1E488F ΔE 0.069
- Dark Blue Grey #1F3B4D ΔE 0.070
- Dark Grey Blue #29465B ΔE 0.072
- Midnight Blue #191970 ΔE 0.073
Use #233571 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.