#233F63
Closest named color: Dark Grey Blue (#29465B). oklch(36.4% 0.071 255.4), rgb(35, 63, 99).
Aa
White text reads best on this color (10.69:1).
About this color
#233F63 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.071 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.031 away. White text reads best on it, at 10.69:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.071) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 1.96:1 |
| White text | 10.69:1 |
Values
| HEX | #233F63 |
| RGB | rgb(35, 63, 99) |
| HSL | hsl(214, 48%, 26%) |
| OKLCH | oklch(36.4% 0.071 255.4) |
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 #233F63 | 10.69:1 | AAA | Lc -98.6 | Preferred for body text |
| Black text on #233F63 | 1.96:1 | Fails | Lc 9.3 | Not readable |
| #233F63 text on white | 10.69:1 | AAA | Lc 94.7 | Preferred for body text |
| #233F63 text on black | 1.96:1 | Fails | Lc -7.9 | 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
#E3EBF4
oklch(93.7% 0.015 251.2)
-
Step 200
200
#CCDBED
oklch(88.6% 0.03 253)
-
Step 300
300
#AAC3E3
oklch(80.9% 0.053 254.7)
-
Step 400
400
#7DA3D6
oklch(70.7% 0.086 255.9)
-
Step 500
500
#5B8BCB
oklch(63% 0.11 256)
-
Step 600
600
#4074B7
oklch(55.5% 0.119 255.6)
-
Step 700
700
#32619E
oklch(49% 0.111 255.8)
-
Step 800
800
#2A5080
oklch(42.8% 0.091 255.2)
-
Step 900
900 (this color)
#233F63
oklch(36.4% 0.071 255.4)
-
Step 950
950
#17273C
oklch(27% 0.045 255.6)
#233F63 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) | #304165 | 0.019 |
| Deuteranopia (no green cones) | #273B62 | 0.012 |
| Tritanopia (no blue cones) | #00474C | 0.060 |
| Achromatopsia (no color) | #3E3E3E | 0.071 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #233F63
#233F63
oklch(36.4% 0.071 255.4)
- #543808
#543808
oklch(36.5% 0.072 75)
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 #233F63, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.031
- Prussian Blue #1D3557 ΔE 0.037
- Marine Blue #01386A ΔE 0.039
- Dark Blue Grey #1F3B4D ΔE 0.039
- Twilight Blue #0A437A ΔE 0.041
- Charcoal #264653 ΔE 0.041
- Midnight Green #073B4C ΔE 0.050
- Onyx #343A40 ΔE 0.061
Use #233F63 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.