#233D5E
Closest named color: Prussian Blue (#1D3557). oklch(35.6% 0.066 255.1), rgb(35, 61, 94).
Aa
White text reads best on this color (11.04:1).
About this color
#233D5E is a dark, muted blue. In OKLCH its lightness is 36%, its chroma 0.066 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.028 away. White text reads best on it, at 11.04:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | muted (0.066) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.90:1 |
| White text | 11.04:1 |
Values
| HEX | #233D5E |
| RGB | rgb(35, 61, 94) |
| HSL | hsl(214, 46%, 25%) |
| OKLCH | oklch(35.6% 0.066 255.1) |
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 #233D5E | 11.04:1 | AAA | Lc -99.3 | Preferred for body text |
| Black text on #233D5E | 1.90:1 | Fails | Lc 8.5 | Not readable |
| #233D5E text on white | 11.04:1 | AAA | Lc 95.4 | Preferred for body text |
| #233D5E text on black | 1.90:1 | 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E4EBF4
oklch(93.7% 0.014 254.6)
-
Step 200
200
#CDDAEC
oklch(88.4% 0.029 256.5)
-
Step 300
300
#ACC3E1
oklch(81% 0.049 255.1)
-
Step 400
400
#7FA3D2
oklch(70.7% 0.08 255.3)
-
Step 500
500
#5E8CC6
oklch(63.2% 0.101 254.8)
-
Step 600
600
#4475B2
oklch(55.6% 0.109 254.8)
-
Step 700
700
#36629A
oklch(49.2% 0.103 255.3)
-
Step 800
800
#2D507C
oklch(42.7% 0.084 255)
-
Step 900
900 (this color)
#233D5E
oklch(35.6% 0.066 255.1)
-
Step 950
950
#18273B
oklch(27% 0.043 255.9)
#233D5E 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) | #2F3F5F | 0.017 |
| Deuteranopia (no green cones) | #28395D | 0.013 |
| Tritanopia (no blue cones) | #004449 | 0.056 |
| Achromatopsia (no color) | #3C3C3C | 0.066 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #233D5E
#233D5E
oklch(35.6% 0.066 255.1)
- #50360D
#50360D
oklch(35.5% 0.066 74.3)
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 #233D5E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.028
- Dark Blue Grey #1F3B4D ΔE 0.031
- Dark Grey Blue #29465B ΔE 0.033
- Marine Blue #01386A ΔE 0.039
- Charcoal #264653 ΔE 0.040
- Midnight Green #073B4C ΔE 0.042
- Twilight Blue #0A437A ΔE 0.049
- Onyx #343A40 ΔE 0.054
Use #233D5E 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.