#233F61
Closest named color: Dark Grey Blue (#29465B). oklch(36.3% 0.068 254.2), rgb(35, 63, 97).
Aa
White text reads best on this color (10.74:1).
About this color
#233F61 is a dark, muted blue. In OKLCH its lightness is 36%, its chroma 0.068 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.029 away. White text reads best on it, at 10.74:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | muted (0.068) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 1.95:1 |
| White text | 10.74:1 |
Values
| HEX | #233F61 |
| RGB | rgb(35, 63, 97) |
| HSL | hsl(213, 47%, 26%) |
| OKLCH | oklch(36.3% 0.068 254.2) |
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 #233F61 | 10.74:1 | AAA | Lc -98.7 | Preferred for body text |
| Black text on #233F61 | 1.95:1 | Fails | Lc 9.2 | Not readable |
| #233F61 text on white | 10.74:1 | AAA | Lc 94.7 | Preferred for body text |
| #233F61 text on black | 1.95:1 | Fails | Lc -7.9 | 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
#E3EBF4
oklch(93.7% 0.015 251.2)
-
Step 200
200
#CDDBEC
oklch(88.6% 0.028 253.2)
-
Step 300
300
#AAC3E2
oklch(80.9% 0.052 253.9)
-
Step 400
400
#7DA3D3
oklch(70.6% 0.082 254.6)
-
Step 500
500
#5B8CC8
oklch(63.1% 0.105 254.2)
-
Step 600
600
#4175B4
oklch(55.6% 0.113 254.3)
-
Step 700
700
#32629B
oklch(49.1% 0.106 254.1)
-
Step 800
800
#2A507E
oklch(42.6% 0.088 254.4)
-
Step 900
900 (this color)
#233F61
oklch(36.3% 0.068 254.2)
-
Step 950
950
#17273B
oklch(26.9% 0.043 254.6)
#233F61 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) | #314162 | 0.020 |
| Deuteranopia (no green cones) | #293B60 | 0.013 |
| Tritanopia (no blue cones) | #00474B | 0.058 |
| Achromatopsia (no color) | #3E3E3E | 0.068 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #233F61
#233F61
oklch(36.3% 0.068 254.2)
- #53380C
#53380C
oklch(36.4% 0.069 74.8)
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 #233F61, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.029
- Prussian Blue #1D3557 ΔE 0.035
- Dark Blue Grey #1F3B4D ΔE 0.036
- Charcoal #264653 ΔE 0.038
- Marine Blue #01386A ΔE 0.041
- Twilight Blue #0A437A ΔE 0.044
- Midnight Green #073B4C ΔE 0.047
- Onyx #343A40 ΔE 0.058
Use #233F61 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.