#304F5F
Closest named color: Dark Slate Gray (#2F4F4F). oklch(41% 0.045 231.9), rgb(48, 79, 95).
Aa
White text reads best on this color (8.71:1).
About this color
#304F5F is a dark, muted blue. In OKLCH its lightness is 41%, its chroma 0.045 and its hue 232°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.028 away. White text reads best on it, at 8.71:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | muted (0.045) |
| Temperature | cool |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.40:1 |
| White text | 8.71:1 |
Values
| HEX | #304F5F |
| RGB | rgb(48, 79, 95) |
| HSL | hsl(200, 33%, 28%) |
| OKLCH | oklch(41% 0.045 231.9) |
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 #304F5F | 8.71:1 | AAA | Lc -94.3 | Preferred for body text |
| Black text on #304F5F | 2.40:1 | Fails | Lc 14.2 | Not readable |
| #304F5F text on white | 8.71:1 | AAA | Lc 89.8 | Fine for body text |
| #304F5F text on black | 2.40:1 | Fails | Lc -12.5 | 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
#F3F6F7
oklch(97.1% 0.003 219.5)
-
Step 100
100
#E5EBEE
oklch(93.6% 0.008 228.9)
-
Step 200
200
#D0DBE1
oklch(88.5% 0.015 231.2)
-
Step 300
300
#B0C4CF
oklch(80.9% 0.027 231.7)
-
Step 400
400
#87A6B7
oklch(70.8% 0.042 232.1)
-
Step 500
500
#6890A5
oklch(63.2% 0.054 231.6)
-
Step 600
600
#4F7A90
oklch(55.7% 0.059 231.5)
-
Step 700
700
#3F667B
oklch(49% 0.056 233.1)
-
Step 800
800 (this color)
#304F5F
oklch(41% 0.045 231.9)
-
Step 900
900
#2E4551
oklch(37.7% 0.035 231.6)
-
Step 950
950
#1B2930
oklch(27.1% 0.023 230.3)
#304F5F 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) | #474E60 | 0.031 |
| Deuteranopia (no green cones) | #40495F | 0.027 |
| Tritanopia (no blue cones) | #1B5354 | 0.033 |
| Achromatopsia (no color) | #4B4B4B | 0.046 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #304F5F
#304F5F
oklch(41% 0.045 231.9)
- #5F4433
#5F4433
oklch(41.2% 0.046 53.2)
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 #304F5F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.028
- Dark Grey Blue #29465B ΔE 0.031
- Charcoal #264653 ΔE 0.035
- Deep Teal #00555A ΔE 0.038
- Dark Teal #014D4E ΔE 0.048
- Petrol #005F6A ΔE 0.052
- YInMn Blue #415A77 ΔE 0.054
- Charcoal Grey #3C4142 ΔE 0.055
Use #304F5F 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.