#284D53
Closest named color: Dark Slate Gray (#2F4F4F). oklch(39.5% 0.044 209), rgb(40, 77, 83).
Aa
White text reads best on this color (9.22:1).
About this color
#284D53 is a dark, muted teal or cyan. In OKLCH its lightness is 40%, its chroma 0.044 and its hue 209°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.013 away. White text reads best on it, at 9.22:1.
| Hue family | Teals and cyans |
| Lightness | dark (40%) |
| Chroma | muted (0.044) |
| Temperature | cool |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.27:1 |
| White text | 9.22:1 |
Values
| HEX | #284D53 |
| RGB | rgb(40, 77, 83) |
| HSL | hsl(188, 35%, 24%) |
| OKLCH | oklch(39.5% 0.044 209) |
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 #284D53 | 9.22:1 | AAA | Lc -95.5 | Preferred for body text |
| Black text on #284D53 | 2.27:1 | Fails | Lc 12.8 | Not readable |
| #284D53 text on white | 9.22:1 | AAA | Lc 91.2 | Preferred for body text |
| #284D53 text on black | 2.27:1 | Fails | Lc -11.2 | 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
#F2F6F7
oklch(97% 0.004 214.3)
-
Step 100
100
#E3ECED
oklch(93.7% 0.01 204.9)
-
Step 200
200
#CCDDDF
oklch(88.5% 0.018 205.3)
-
Step 300
300
#A9C7CC
oklch(80.9% 0.033 208.8)
-
Step 400
400
#7AAAB2
oklch(70.7% 0.052 208.9)
-
Step 500
500
#56959F
oklch(63.1% 0.067 208.7)
-
Step 600
600
#387F8A
oklch(55.6% 0.072 209)
-
Step 700
700
#296B75
oklch(49% 0.068 208.9)
-
Step 800
800
#24575F
oklch(42.6% 0.056 209.1)
-
Step 900
900 (this color)
#284D53
oklch(39.5% 0.044 209)
-
Step 950
950
#152A2E
oklch(26.9% 0.028 211.1)
#284D53 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) | #474A53 | 0.041 |
| Deuteranopia (no green cones) | #404553 | 0.038 |
| Tritanopia (no blue cones) | #11504F | 0.022 |
| Achromatopsia (no color) | #474747 | 0.044 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #284D53
#284D53
oklch(39.5% 0.044 209)
- #5C3E39
#5C3E39
oklch(39.7% 0.043 29.7)
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 #284D53, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.013
- Charcoal #264653 ΔE 0.024
- Dark Teal #014D4E ΔE 0.028
- Deep Teal #00555A ΔE 0.030
- Dark Grey Blue #29465B ΔE 0.030
- Dark Blue Green #005249 ΔE 0.037
- Charcoal Grey #3C4142 ΔE 0.044
- Petrol #005F6A ΔE 0.059
Use #284D53 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.