#233F5D
Closest named color: Dark Grey Blue (#29465B). oklch(36% 0.063 251.4), rgb(35, 63, 93).
Aa
White text reads best on this color (10.82:1).
About this color
#233F5D is a dark, muted blue. In OKLCH its lightness is 36%, its chroma 0.063 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.026 away. White text reads best on it, at 10.82:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | muted (0.063) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 1.94:1 |
| White text | 10.82:1 |
Values
| HEX | #233F5D |
| RGB | rgb(35, 63, 93) |
| HSL | hsl(211, 45%, 25%) |
| OKLCH | oklch(36% 0.063 251.4) |
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 #233F5D | 10.82:1 | AAA | Lc -98.8 | Preferred for body text |
| Black text on #233F5D | 1.94:1 | Fails | Lc 9.0 | Not readable |
| #233F5D text on white | 10.82:1 | AAA | Lc 94.9 | Preferred for body text |
| #233F5D text on black | 1.94:1 | Fails | Lc -7.7 | 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E3EBF3
oklch(93.6% 0.014 248)
-
Step 200
200
#CDDBEA
oklch(88.5% 0.026 250)
-
Step 300
300
#ABC3DF
oklch(80.8% 0.048 252.4)
-
Step 400
400
#7EA4CE
oklch(70.6% 0.075 251.4)
-
Step 500
500
#5C8DC2
oklch(63.1% 0.096 251.4)
-
Step 600
600
#4276AE
oklch(55.5% 0.104 251.8)
-
Step 700
700
#336396
oklch(49% 0.098 251.7)
-
Step 800
800
#2B5179
oklch(42.6% 0.08 251.3)
-
Step 900
900 (this color)
#233F5D
oklch(36% 0.063 251.4)
-
Step 950
950
#172839
oklch(27.1% 0.039 249.5)
#233F5D 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) | #32405E | 0.020 |
| Deuteranopia (no green cones) | #2B3B5C | 0.015 |
| Tritanopia (no blue cones) | #00464A | 0.052 |
| Achromatopsia (no color) | #3D3D3D | 0.063 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #233F5D
#233F5D
oklch(36% 0.063 251.4)
- #523714
#523714
oklch(36.1% 0.063 70.3)
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 #233F5D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.026
- Dark Blue Grey #1F3B4D ΔE 0.030
- Charcoal #264653 ΔE 0.033
- Prussian Blue #1D3557 ΔE 0.034
- Midnight Green #073B4C ΔE 0.041
- Marine Blue #01386A ΔE 0.044
- Twilight Blue #0A437A ΔE 0.050
- Onyx #343A40 ΔE 0.052
Use #233F5D 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.