#233D4F
Closest named color: Dark Blue Grey (#1F3B4D). oklch(34.7% 0.045 240), rgb(35, 61, 79).
Aa
White text reads best on this color (11.33:1).
About this color
#233D4F is a dark, muted blue. In OKLCH its lightness is 35%, its chroma 0.045 and its hue 240°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.009 away. White text reads best on it, at 11.33:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | muted (0.045) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.85:1 |
| White text | 11.33:1 |
Values
| HEX | #233D4F |
| RGB | rgb(35, 61, 79) |
| HSL | hsl(205, 39%, 22%) |
| OKLCH | oklch(34.7% 0.045 240) |
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 #233D4F | 11.33:1 | AAA | Lc -99.8 | Preferred for body text |
| Black text on #233D4F | 1.85:1 | Fails | Lc 7.8 | Not readable |
| #233D4F text on white | 11.33:1 | AAA | Lc 96.1 | Preferred for body text |
| #233D4F text on black | 1.85:1 | 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
#F3F6F8
oklch(97.1% 0.004 236.5)
-
Step 100
100
#E4EBF0
oklch(93.6% 0.01 238.5)
-
Step 200
200
#CFDBE4
oklch(88.5% 0.018 240)
-
Step 300
300
#AEC4D5
oklch(80.9% 0.034 241.2)
-
Step 400
400
#82A6BF
oklch(70.7% 0.054 238.8)
-
Step 500
500
#628FAF
oklch(63% 0.069 240.2)
-
Step 600
600
#48799B
oklch(55.6% 0.075 240.3)
-
Step 700
700
#396684
oklch(49.1% 0.069 239.5)
-
Step 800
800
#30536C
oklch(42.7% 0.058 241)
-
Step 900
900 (this color)
#233D4F
oklch(34.7% 0.045 240)
-
Step 950
950
#192833
oklch(26.9% 0.029 241)
#233D4F 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) | #353D50 | 0.025 |
| Deuteranopia (no green cones) | #2F384F | 0.021 |
| Tritanopia (no blue cones) | #0C4143 | 0.035 |
| Achromatopsia (no color) | #3A3A3A | 0.045 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #233D4F
#233D4F
oklch(34.7% 0.045 240)
- #4B3421
#4B3421
oklch(34.7% 0.045 60.1)
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 #233D4F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.009
- Midnight Green #073B4C ΔE 0.026
- Charcoal #264653 ΔE 0.030
- Onyx #343A40 ΔE 0.032
- Dark Grey Blue #29465B ΔE 0.034
- Prussian Blue #1D3557 ΔE 0.034
- Gunmetal #293241 ΔE 0.038
- Charcoal Grey #3C4142 ΔE 0.046
Use #233D4F 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.