#233F55
Closest named color: Dark Blue Grey (#1F3B4D). oklch(35.6% 0.051 243.6), rgb(35, 63, 85).
Aa
White text reads best on this color (10.97:1).
About this color
#233F55 is a dark, muted blue. In OKLCH its lightness is 36%, its chroma 0.051 and its hue 244°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.018 away. White text reads best on it, at 10.97:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | muted (0.051) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.91:1 |
| White text | 10.97:1 |
Values
| HEX | #233F55 |
| RGB | rgb(35, 63, 85) |
| HSL | hsl(206, 42%, 24%) |
| OKLCH | oklch(35.6% 0.051 243.6) |
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 #233F55 | 10.97:1 | AAA | Lc -99.1 | Preferred for body text |
| Black text on #233F55 | 1.91:1 | Fails | Lc 8.6 | Not readable |
| #233F55 text on white | 10.97:1 | AAA | Lc 95.3 | Preferred for body text |
| #233F55 text on black | 1.91:1 | Fails | Lc -7.4 | 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
#F3F6F9
oklch(97.2% 0.005 247.9)
-
Step 100
100
#E4EBF1
oklch(93.6% 0.011 243.7)
-
Step 200
200
#CEDBE7
oklch(88.5% 0.022 245.9)
-
Step 300
300
#ACC4D8
oklch(80.9% 0.039 243.3)
-
Step 400
400
#80A6C5
oklch(70.8% 0.062 243.4)
-
Step 500
500
#5F8FB6
oklch(63.1% 0.079 244)
-
Step 600
600
#4479A2
oklch(55.7% 0.086 243.5)
-
Step 700
700
#35658A
oklch(49% 0.079 243.7)
-
Step 800
800
#2D5370
oklch(42.7% 0.065 243.2)
-
Step 900
900 (this color)
#233F55
oklch(35.6% 0.051 243.6)
-
Step 950
950
#182835
oklch(26.9% 0.033 243.9)
#233F55 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) | #363F56 | 0.026 |
| Deuteranopia (no green cones) | #2F3A55 | 0.021 |
| Tritanopia (no blue cones) | #034446 | 0.043 |
| Achromatopsia (no color) | #3C3C3C | 0.051 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #233F55
#233F55
oklch(35.6% 0.051 243.6)
- #4F361E
#4F361E
oklch(35.6% 0.051 63.7)
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 #233F55, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.018
- Dark Grey Blue #29465B ΔE 0.025
- Charcoal #264653 ΔE 0.025
- Midnight Green #073B4C ΔE 0.033
- Prussian Blue #1D3557 ΔE 0.036
- Onyx #343A40 ΔE 0.040
- Gunmetal #293241 ΔE 0.047
- Charcoal Grey #3C4142 ΔE 0.048
Use #233F55 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.