#233B59
Closest named color: Prussian Blue (#1D3557). oklch(34.8% 0.061 254.7), rgb(35, 59, 89).
Aa
White text reads best on this color (11.40:1).
About this color
#233B59 is a dark, muted blue. In OKLCH its lightness is 35%, its chroma 0.061 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.021 away. White text reads best on it, at 11.40:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | muted (0.061) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.84:1 |
| White text | 11.40:1 |
Values
| HEX | #233B59 |
| RGB | rgb(35, 59, 89) |
| HSL | hsl(213, 44%, 24%) |
| OKLCH | oklch(34.8% 0.061 254.7) |
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 #233B59 | 11.40:1 | AAA | Lc -99.9 | Preferred for body text |
| Black text on #233B59 | 1.84:1 | Fails | Lc 7.7 | Not readable |
| #233B59 text on white | 11.40:1 | AAA | Lc 96.2 | Preferred for body text |
| #233B59 text on black | 1.84:1 | 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
#E4EAF3
oklch(93.5% 0.014 258.3)
-
Step 200
200
#CEDAEA
oklch(88.4% 0.026 255.6)
-
Step 300
300
#ADC3DE
oklch(80.9% 0.045 253.6)
-
Step 400
400
#82A3CE
oklch(70.7% 0.073 255.2)
-
Step 500
500
#628CC1
oklch(63.1% 0.093 254.7)
-
Step 600
600
#4875AD
oklch(55.5% 0.101 254.7)
-
Step 700
700
#396295
oklch(49% 0.095 254.7)
-
Step 800
800
#305079
oklch(42.6% 0.078 255.2)
-
Step 900
900 (this color)
#233B59
oklch(34.8% 0.061 254.7)
-
Step 950
950
#192739
oklch(26.9% 0.039 255.1)
#233B59 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) | #2F3D5A | 0.018 |
| Deuteranopia (no green cones) | #283758 | 0.013 |
| Tritanopia (no blue cones) | #004246 | 0.053 |
| Achromatopsia (no color) | #3A3A3A | 0.061 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #233B59
#233B59
oklch(34.8% 0.061 254.7)
- #4C3511
#4C3511
oklch(34.8% 0.06 75.3)
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 #233B59, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.021
- Dark Blue Grey #1F3B4D ΔE 0.023
- Midnight Green #073B4C ΔE 0.035
- Dark Grey Blue #29465B ΔE 0.037
- Charcoal #264653 ΔE 0.041
- Marine Blue #01386A ΔE 0.042
- Gunmetal #293241 ΔE 0.045
- Onyx #343A40 ΔE 0.048
Use #233B59 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.