#233F4A
Closest named color: Dark Blue Grey (#1F3B4D). oklch(35% 0.039 225.2), rgb(35, 63, 74).
Aa
White text reads best on this color (11.16:1).
About this color
#233F4A is a dark, muted teal or cyan. In OKLCH its lightness is 35%, its chroma 0.039 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 11.16:1.
| Hue family | Teals and cyans |
| Lightness | dark (35%) |
| Chroma | muted (0.039) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.88:1 |
| White text | 11.16:1 |
Values
| HEX | #233F4A |
| RGB | rgb(35, 63, 74) |
| HSL | hsl(197, 36%, 21%) |
| OKLCH | oklch(35% 0.039 225.2) |
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 #233F4A | 11.16:1 | AAA | Lc -99.5 | Preferred for body text |
| Black text on #233F4A | 1.88:1 | Fails | Lc 8.2 | Not readable |
| #233F4A text on white | 11.16:1 | AAA | Lc 95.7 | Preferred for body text |
| #233F4A text on black | 1.88:1 | 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
#E4EBEE
oklch(93.6% 0.009 225.1)
-
Step 200
200
#CEDCE1
oklch(88.5% 0.017 221.1)
-
Step 300
300
#AEC5CF
oklch(80.9% 0.029 225.8)
-
Step 400
400
#82A7B7
oklch(70.7% 0.047 226.2)
-
Step 500
500
#6191A5
oklch(63% 0.06 226.1)
-
Step 600
600
#477B90
oklch(55.5% 0.064 226)
-
Step 700
700
#38687B
oklch(49.1% 0.06 225.8)
-
Step 800
800
#2F5564
oklch(42.8% 0.05 225.5)
-
Step 900
900 (this color)
#233F4A
oklch(35% 0.039 225.2)
-
Step 950
950
#192930
oklch(27% 0.025 227.2)
#233F4A 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) | #393E4B | 0.031 |
| Deuteranopia (no green cones) | #33394A | 0.028 |
| Tritanopia (no blue cones) | #104242 | 0.027 |
| Achromatopsia (no color) | #3B3B3B | 0.039 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #233F4A
#233F4A
oklch(35% 0.039 225.2)
- #4C342A
#4C342A
oklch(35% 0.039 43.5)
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 #233F4A, 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
- Charcoal #264653 ΔE 0.025
- Onyx #343A40 ΔE 0.028
- Midnight Green #073B4C ΔE 0.029
- Dark Grey Blue #29465B ΔE 0.035
- Charcoal Grey #3C4142 ΔE 0.038
- Gunmetal #293241 ΔE 0.042
- Prussian Blue #1D3557 ΔE 0.046
Use #233F4A 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.