#233D5C
Closest named color: Dark Blue Grey (#1F3B4D). oklch(35.5% 0.063 253.7), rgb(35, 61, 92).
Aa
White text reads best on this color (11.09:1).
About this color
#233D5C is a dark, muted blue. In OKLCH its lightness is 35%, its chroma 0.063 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.027 away. White text reads best on it, at 11.09:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | muted (0.063) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.89:1 |
| White text | 11.09:1 |
Values
| HEX | #233D5C |
| RGB | rgb(35, 61, 92) |
| HSL | hsl(213, 45%, 25%) |
| OKLCH | oklch(35.5% 0.063 253.7) |
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 #233D5C | 11.09:1 | AAA | Lc -99.3 | Preferred for body text |
| Black text on #233D5C | 1.89:1 | Fails | Lc 8.4 | Not readable |
| #233D5C text on white | 11.09:1 | AAA | Lc 95.5 | Preferred for body text |
| #233D5C text on black | 1.89:1 | 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
#F3F6FA
oklch(97.2% 0.006 255.5)
-
Step 100
100
#E4EBF3
oklch(93.7% 0.013 251.6)
-
Step 200
200
#CEDBEB
oklch(88.6% 0.026 253.6)
-
Step 300
300
#ACC3DF
oklch(80.9% 0.047 253.5)
-
Step 400
400
#80A4CF
oklch(70.8% 0.075 253.2)
-
Step 500
500
#5F8CC3
oklch(63.1% 0.097 254.1)
-
Step 600
600
#4575AF
oklch(55.5% 0.105 254.1)
-
Step 700
700
#366297
oklch(49% 0.099 254.2)
-
Step 800
800
#2D517A
oklch(42.8% 0.08 252.9)
-
Step 900
900 (this color)
#233D5C
oklch(35.5% 0.063 253.7)
-
Step 950
950
#18273A
oklch(26.9% 0.041 254.8)
#233D5C 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) | #303F5D | 0.019 |
| Deuteranopia (no green cones) | #29395B | 0.013 |
| Tritanopia (no blue cones) | #004448 | 0.054 |
| Achromatopsia (no color) | #3C3C3C | 0.063 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #233D5C
#233D5C
oklch(35.5% 0.063 253.7)
- #4F3610
#4F3610
oklch(35.4% 0.063 74.1)
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 #233D5C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.027
- Prussian Blue #1D3557 ΔE 0.028
- Dark Grey Blue #29465B ΔE 0.032
- Charcoal #264653 ΔE 0.038
- Midnight Green #073B4C ΔE 0.039
- Marine Blue #01386A ΔE 0.041
- Onyx #343A40 ΔE 0.051
- Gunmetal #293241 ΔE 0.052
Use #233D5C 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.