#10403B
Closest named color: Midnight Green (#073B4C). oklch(33.8% 0.051 185.2), rgb(16, 64, 59).
Aa
White text reads best on this color (11.54:1).
About this color
#10403B is a dark, muted teal or cyan. In OKLCH its lightness is 34%, its chroma 0.051 and its hue 185°. Its hue sits on the cool side of the wheel. The nearest named color is Midnight Green (#073B4C), ΔE 0.040 away. White text reads best on it, at 11.54:1.
| Hue family | Teals and cyans |
| Lightness | dark (34%) |
| Chroma | muted (0.051) |
| Temperature | cool |
| Nearest name | Midnight Green (#073B4C) |
| Black text | 1.81:1 |
| White text | 11.54:1 |
Values
| HEX | #10403B |
| RGB | rgb(16, 64, 59) |
| HSL | hsl(174, 60%, 16%) |
| OKLCH | oklch(33.8% 0.051 185.2) |
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 #10403B | 11.54:1 | AAA | Lc -100.1 | Preferred for body text |
| Black text on #10403B | 1.81:1 | Fails | Lc 7.5 | Not readable |
| #10403B text on white | 11.54:1 | AAA | Lc 96.3 | Preferred for body text |
| #10403B text on black | 1.81:1 | 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 900.
-
Step 50
50
#F2F7F6
oklch(97.2% 0.005 183)
-
Step 100
100
#E2ECEB
oklch(93.5% 0.011 189.8)
-
Step 200
200
#CADEDB
oklch(88.5% 0.022 186)
-
Step 300
300
#A6C9C4
oklch(80.9% 0.038 185.9)
-
Step 400
400
#74ADA6
oklch(70.6% 0.061 186.2)
-
Step 500
500
#4B9990
oklch(63.1% 0.078 185.5)
-
Step 600
600
#28837A
oklch(55.5% 0.085 185.6)
-
Step 700
700
#186F67
oklch(49.1% 0.079 185.7)
-
Step 800
800
#185B54
oklch(42.8% 0.066 185)
-
Step 900
900 (this color)
#10403B
oklch(33.8% 0.051 185.2)
-
Step 950
950
#122C29
oklch(27.1% 0.033 185.7)
#10403B 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) | #3C3C3B | 0.054 |
| Deuteranopia (no green cones) | #35373C | 0.051 |
| Tritanopia (no blue cones) | #00423E | 0.009 |
| Achromatopsia (no color) | #393939 | 0.052 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #10403B
#10403B
oklch(33.8% 0.051 185.2)
- #4E2C34
#4E2C34
oklch(33.9% 0.051 5)
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 #10403B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Midnight Green #073B4C ΔE 0.040
- Evergreen #05472A ΔE 0.044
- Dark Blue Grey #1F3B4D ΔE 0.044
- Dark Teal #014D4E ΔE 0.046
- Onyx #343A40 ΔE 0.047
- Charcoal #264653 ΔE 0.050
- Pakistan Green #283618 ΔE 0.055
- Charcoal Grey #3C4142 ΔE 0.056
Use #10403B 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.