#233A3F
Closest named color: Dark Blue Grey (#1F3B4D). oklch(33.2% 0.03 212.9), rgb(35, 58, 63).
Aa
White text reads best on this color (12.01:1).
About this color
#233A3F is a dark, muted teal or cyan. In OKLCH its lightness is 33%, its chroma 0.030 and its hue 213°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.024 away. White text reads best on it, at 12.01:1.
| Hue family | Teals and cyans |
| Lightness | dark (33%) |
| Chroma | muted (0.030) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.74:1 |
| White text | 12.01:1 |
Values
| HEX | #233A3F |
| RGB | rgb(35, 58, 63) |
| HSL | hsl(191, 29%, 19%) |
| OKLCH | oklch(33.2% 0.03 212.9) |
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 #233A3F | 12.01:1 | AAA | Lc -101.0 | Preferred for body text |
| Black text on #233A3F | 1.74:1 | Fails | Lc 0.0 | Not readable |
| #233A3F text on white | 12.01:1 | AAA | Lc 97.4 | Preferred for body text |
| #233A3F text on black | 1.74:1 | 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
#E5EBEC
oklch(93.6% 0.007 208.8)
-
Step 200
200
#D0DBDE
oklch(88.4% 0.013 215.8)
-
Step 300
300
#B1C5C9
oklch(81% 0.023 211.1)
-
Step 400
400
#87A7AE
oklch(70.7% 0.037 212.5)
-
Step 500
500
#69919A
oklch(63% 0.046 213.1)
-
Step 600
600
#507B85
oklch(55.5% 0.05 213.9)
-
Step 700
700
#406870
oklch(49.1% 0.047 211.7)
-
Step 800
800
#35555C
oklch(42.8% 0.039 213)
-
Step 900
900 (this color)
#233A3F
oklch(33.2% 0.03 212.9)
-
Step 950
950
#1C292C
oklch(27% 0.019 213.5)
#233A3F 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) | #36383F | 0.028 |
| Deuteranopia (no green cones) | #31353F | 0.025 |
| Tritanopia (no blue cones) | #183C3B | 0.017 |
| Achromatopsia (no color) | #363636 | 0.030 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #233A3F
#233A3F
oklch(33.2% 0.03 212.9)
- #44302C
#44302C
oklch(33.1% 0.03 31.5)
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 #233A3F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.024
- Onyx #343A40 ΔE 0.025
- Gunmetal #293241 ΔE 0.029
- Midnight Green #073B4C ΔE 0.030
- Charcoal Grey #3C4142 ΔE 0.046
- Space Cadet #2B2D42 ΔE 0.046
- Charcoal #264653 ΔE 0.047
- Prussian Blue #1D3557 ΔE 0.051
Use #233A3F 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.