#233B5F
Closest named color: Prussian Blue (#1D3557). oklch(35.1% 0.07 258.3), rgb(35, 59, 95).
Aa
White text reads best on this color (11.27:1).
About this color
#233B5F is a dark, muted blue. In OKLCH its lightness is 35%, its chroma 0.070 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.024 away. White text reads best on it, at 11.27:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | muted (0.070) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.86:1 |
| White text | 11.27:1 |
Values
| HEX | #233B5F |
| RGB | rgb(35, 59, 95) |
| HSL | hsl(216, 46%, 25%) |
| OKLCH | oklch(35.1% 0.07 258.3) |
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 #233B5F | 11.27:1 | AAA | Lc -99.7 | Preferred for body text |
| Black text on #233B5F | 1.86:1 | Fails | Lc 8.0 | Not readable |
| #233B5F text on white | 11.27:1 | AAA | Lc 95.9 | Preferred for body text |
| #233B5F text on black | 1.86:1 | 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
#E4EAF4
oklch(93.5% 0.015 260.7)
-
Step 200
200
#CEDAED
oklch(88.5% 0.029 259.6)
-
Step 300
300
#ACC2E3
oklch(80.8% 0.053 258.4)
-
Step 400
400
#80A2D5
oklch(70.6% 0.084 258.3)
-
Step 500
500
#608ACA
oklch(63% 0.108 258.6)
-
Step 600
600
#4673B7
oklch(55.5% 0.117 258.4)
-
Step 700
700
#38609D
oklch(49% 0.108 258.6)
-
Step 800
800
#2F4F80
oklch(42.8% 0.09 258.7)
-
Step 900
900 (this color)
#233B5F
oklch(35.1% 0.07 258.3)
-
Step 950
950
#19273C
oklch(27.1% 0.044 258.3)
#233B5F 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) | #2C3E60 | 0.016 |
| Deuteranopia (no green cones) | #24385E | 0.009 |
| Tritanopia (no blue cones) | #004348 | 0.061 |
| Achromatopsia (no color) | #3B3B3B | 0.070 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #233B5F
#233B5F
oklch(35.1% 0.07 258.3)
- #4F3604
#4F3604
oklch(35.3% 0.071 78.6)
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 #233B5F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.024
- Dark Blue Grey #1F3B4D ΔE 0.033
- Marine Blue #01386A ΔE 0.035
- Dark Grey Blue #29465B ΔE 0.040
- Midnight Green #073B4C ΔE 0.044
- Charcoal #264653 ΔE 0.047
- Twilight Blue #0A437A ΔE 0.049
- Marine #042E60 ΔE 0.053
Use #233B5F 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.