#233A43
Closest named color: Dark Blue Grey (#1F3B4D). oklch(33.3% 0.033 224.7), rgb(35, 58, 67).
Aa
White text reads best on this color (11.94:1).
About this color
#233A43 is a dark, muted teal or cyan. In OKLCH its lightness is 33%, its chroma 0.033 and its hue 225°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.017 away. White text reads best on it, at 11.94:1.
| Hue family | Teals and cyans |
| Lightness | dark (33%) |
| Chroma | muted (0.033) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.75:1 |
| White text | 11.94:1 |
Values
| HEX | #233A43 |
| RGB | rgb(35, 58, 67) |
| HSL | hsl(197, 31%, 20%) |
| OKLCH | oklch(33.3% 0.033 224.7) |
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 #233A43 | 11.94:1 | AAA | Lc -100.9 | Preferred for body text |
| Black text on #233A43 | 1.75:1 | Fails | Lc 0.0 | Not readable |
| #233A43 text on white | 11.94:1 | AAA | Lc 97.3 | Preferred for body text |
| #233A43 text on black | 1.75:1 | 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
#F3F6F7
oklch(97.1% 0.003 219.5)
-
Step 100
100
#E5EBED
oklch(93.6% 0.007 219.6)
-
Step 200
200
#D0DBE0
oklch(88.5% 0.014 226.6)
-
Step 300
300
#B1C4CD
oklch(80.9% 0.024 227.8)
-
Step 400
400
#87A6B3
oklch(70.6% 0.039 225.3)
-
Step 500
500
#6890A1
oklch(63% 0.051 226.1)
-
Step 600
600
#4F7A8C
oklch(55.5% 0.055 226.3)
-
Step 700
700
#3F6776
oklch(49% 0.051 223.9)
-
Step 800
800
#355460
oklch(42.7% 0.042 224.4)
-
Step 900
900 (this color)
#233A43
oklch(33.3% 0.033 224.7)
-
Step 950
950
#1B292E
oklch(27% 0.021 222)
#233A43 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) | #353943 | 0.026 |
| Deuteranopia (no green cones) | #303543 | 0.024 |
| Tritanopia (no blue cones) | #163D3D | 0.022 |
| Achromatopsia (no color) | #373737 | 0.033 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #233A43
#233A43
oklch(33.3% 0.033 224.7)
- #453128
#453128
oklch(33.4% 0.033 45.3)
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 #233A43, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.017
- Onyx #343A40 ΔE 0.024
- Midnight Green #073B4C ΔE 0.026
- Gunmetal #293241 ΔE 0.027
- Charcoal #264653 ΔE 0.043
- Space Cadet #2B2D42 ΔE 0.044
- Prussian Blue #1D3557 ΔE 0.044
- Charcoal Grey #3C4142 ΔE 0.046
Use #233A43 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.