#233A39
Closest named color: Onyx (#343A40). oklch(32.9% 0.029 192.4), rgb(35, 58, 57).
Aa
White text reads best on this color (12.09:1).
About this color
#233A39 is a dark close to neutral grey. In OKLCH its lightness is 33%, its chroma 0.029. It has too little chroma to lean warm or cool. The nearest named color is Onyx (#343A40), ΔE 0.029 away. White text reads best on it, at 12.09:1.
| Hue family | Neutrals |
| Lightness | dark (33%) |
| Chroma | close to neutral grey (0.029) |
| Temperature | neutral |
| Nearest name | Onyx (#343A40) |
| Black text | 1.73:1 |
| White text | 12.09:1 |
Values
| HEX | #233A39 |
| RGB | rgb(35, 58, 57) |
| HSL | hsl(177, 25%, 18%) |
| OKLCH | oklch(32.9% 0.029 192.4) |
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 #233A39 | 12.09:1 | AAA | Lc -101.1 | Preferred for body text |
| Black text on #233A39 | 1.73:1 | Fails | Lc 0.0 | Not readable |
| #233A39 text on white | 12.09:1 | AAA | Lc 97.6 | Preferred for body text |
| #233A39 text on black | 1.73:1 | 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
#F3F6F6
oklch(97.1% 0.003 197.1)
-
Step 100
100
#E5EBEB
oklch(93.6% 0.006 197)
-
Step 200
200
#D1DCDB
oklch(88.6% 0.012 190.4)
-
Step 300
300
#B1C5C4
oklch(80.8% 0.022 193.1)
-
Step 400
400
#88A8A6
oklch(70.7% 0.035 191.7)
-
Step 500
500
#6A9290
oklch(63% 0.044 192.2)
-
Step 600
600
#517D7B
oklch(55.7% 0.049 192.2)
-
Step 700
700
#416967
oklch(49.1% 0.045 191.8)
-
Step 800
800
#365654
oklch(42.8% 0.038 190.8)
-
Step 900
900 (this color)
#233A39
oklch(32.9% 0.029 192.4)
-
Step 950
950
#1C2929
oklch(26.9% 0.018 196.1)
#233A39 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) | #373839 | 0.030 |
| Deuteranopia (no green cones) | #333539 | 0.028 |
| Tritanopia (no blue cones) | #1A3B3A | 0.010 |
| Achromatopsia (no color) | #363636 | 0.029 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #233A39
#233A39
oklch(32.9% 0.029 192.4)
- #432F31
#432F31
oklch(32.9% 0.03 12.1)
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 #233A39, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.029
- Dark Blue Grey #1F3B4D ΔE 0.035
- Gunmetal #293241 ΔE 0.036
- Midnight Green #073B4C ΔE 0.038
- Charcoal Grey #3C4142 ΔE 0.048
- Pakistan Green #283618 ΔE 0.050
- Space Cadet #2B2D42 ΔE 0.053
- Charcoal #264653 ΔE 0.053
Use #233A39 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.