#10303D
Closest named color: Gunmetal (#293241). oklch(29.2% 0.044 227.9), rgb(16, 48, 61).
Aa
White text reads best on this color (13.88:1).
About this color
#10303D is a dark, muted teal or cyan. In OKLCH its lightness is 29%, its chroma 0.044 and its hue 228°. Its hue sits on the cool side of the wheel. The nearest named color is Gunmetal (#293241), ΔE 0.034 away. White text reads best on it, at 13.88:1.
| Hue family | Teals and cyans |
| Lightness | dark (29%) |
| Chroma | muted (0.044) |
| Temperature | cool |
| Nearest name | Gunmetal (#293241) |
| Black text | 1.51:1 |
| White text | 13.88:1 |
Values
| HEX | #10303D |
| RGB | rgb(16, 48, 61) |
| HSL | hsl(197, 58%, 15%) |
| OKLCH | oklch(29.2% 0.044 227.9) |
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 #10303D | 13.88:1 | AAA | Lc -103.4 | Preferred for body text |
| Black text on #10303D | 1.51:1 | Fails | Lc 0.0 | Not readable |
| #10303D text on white | 13.88:1 | AAA | Lc 100.4 | Preferred for body text |
| #10303D text on black | 1.51:1 | 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 950.
-
Step 50
50
#F1F6F9
oklch(97% 0.007 233.6)
-
Step 100
100
#E0ECF2
oklch(93.6% 0.015 229)
-
Step 200
200
#C6DDE8
oklch(88.4% 0.029 228.1)
-
Step 300
300
#9EC8DB
oklch(80.9% 0.052 227.3)
-
Step 400
400
#65ABCA
oklch(70.7% 0.084 228.4)
-
Step 500
500
#3196BC
oklch(63.2% 0.106 227.6)
-
Step 600
600
#007FA5
oklch(55.7% 0.108 227.8)
-
Step 700
700
#006A8B
oklch(49% 0.096 228.3)
-
Step 800
800
#005773
oklch(42.7% 0.084 228.5)
-
Step 900
900
#09485E
oklch(37.6% 0.069 228)
-
Step 950
950 (this color)
#10303D
oklch(29.2% 0.044 227.9)
#10303D 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) | #292F3E | 0.032 |
| Deuteranopia (no green cones) | #232A3D | 0.029 |
| Tritanopia (no blue cones) | #003434 | 0.028 |
| Achromatopsia (no color) | #2C2C2C | 0.044 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #10303D
#10303D
oklch(29.2% 0.044 227.9)
- #3E2518
#3E2518
oklch(29.3% 0.044 47.9)
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 #10303D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Gunmetal #293241 ΔE 0.034
- Oxford Blue #1B263B ΔE 0.034
- Space Cadet #2B2D42 ΔE 0.038
- Midnight Green #073B4C ΔE 0.040
- Dark #1B2431 ΔE 0.042
- Jet #212529 ΔE 0.046
- Dark Blue Grey #1F3B4D ΔE 0.048
- Prussian Blue #1D3557 ΔE 0.051
Use #10303D 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.