#2F5366
Closest named color: Dark Slate Gray (#2F4F4F). oklch(42.3% 0.052 232.9), rgb(47, 83, 102).
Aa
White text reads best on this color (8.23:1).
About this color
#2F5366 is a dark, muted blue. In OKLCH its lightness is 42%, its chroma 0.052 and its hue 233°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.038 away. White text reads best on it, at 8.23:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | muted (0.052) |
| Temperature | cool |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.55:1 |
| White text | 8.23:1 |
Values
| HEX | #2F5366 |
| RGB | rgb(47, 83, 102) |
| HSL | hsl(201, 37%, 29%) |
| OKLCH | oklch(42.3% 0.052 232.9) |
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 #2F5366 | 8.23:1 | AAA | Lc -93.0 | Preferred for body text |
| Black text on #2F5366 | 2.55:1 | Fails | Lc 15.6 | Dividers and decoration only |
| #2F5366 text on white | 8.23:1 | AAA | Lc 88.4 | Fine for body text |
| #2F5366 text on black | 2.55:1 | Fails | Lc -13.8 | 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 800.
-
Step 50
50
#F3F6F8
oklch(97.1% 0.004 236.5)
-
Step 100
100
#E4EBEF
oklch(93.6% 0.009 232.4)
-
Step 200
200
#CFDBE3
oklch(88.5% 0.017 236.7)
-
Step 300
300
#AEC4D1
oklch(80.8% 0.03 233.7)
-
Step 400
400
#83A6BA
oklch(70.6% 0.048 233.4)
-
Step 500
500
#6390A9
oklch(63% 0.062 233.4)
-
Step 600
600
#487A95
oklch(55.5% 0.068 233.5)
-
Step 700
700
#39677F
oklch(49.1% 0.064 232.9)
-
Step 800
800 (this color)
#2F5366
oklch(42.3% 0.052 232.9)
-
Step 900
900
#2B4554
oklch(37.6% 0.041 234.7)
-
Step 950
950
#192931
oklch(27% 0.026 230.6)
#2F5366 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) | #4A5267 | 0.035 |
| Deuteranopia (no green cones) | #424C66 | 0.031 |
| Tritanopia (no blue cones) | #105859 | 0.040 |
| Achromatopsia (no color) | #4F4F4F | 0.052 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2F5366
#2F5366
oklch(42.3% 0.052 232.9)
- #654633
#654633
oklch(42.4% 0.052 52.4)
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 #2F5366, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.038
- Deep Teal #00555A ΔE 0.039
- YInMn Blue #415A77 ΔE 0.041
- Petrol #005F6A ΔE 0.042
- Dark Grey Blue #29465B ΔE 0.043
- Charcoal #264653 ΔE 0.049
- Deep Sea Blue #015482 ΔE 0.052
- Light Navy Blue #2E5A88 ΔE 0.056
Use #2F5366 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.