#00121B
Closest named color: Rich Navy (#001219). oklch(17% 0.034 228.9), rgb(0, 18, 27).
Aa
White text reads best on this color (19.05:1).
About this color
#00121B is a very dark, muted teal or cyan. In OKLCH its lightness is 17%, its chroma 0.034 and its hue 229°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Navy (#001219), ΔE 0.004 away. White text reads best on it, at 19.05:1.
| Hue family | Teals and cyans |
| Lightness | very dark (17%) |
| Chroma | muted (0.034) |
| Temperature | cool |
| Nearest name | Rich Navy (#001219) |
| Black text | 1.10:1 |
| White text | 19.05:1 |
Values
| HEX | #00121B |
| RGB | rgb(0, 18, 27) |
| HSL | hsl(200, 100%, 5%) |
| OKLCH | oklch(17% 0.034 228.9) |
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 #00121B | 19.05:1 | AAA | Lc -107.4 | Preferred for body text |
| Black text on #00121B | 1.10:1 | Fails | Lc 0.0 | Not readable |
| #00121B text on white | 19.05:1 | AAA | Lc 105.3 | Preferred for body text |
| #00121B text on black | 1.10:1 | 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
#F2F6F8
oklch(97.1% 0.005 228.8)
-
Step 100
100
#E2EBF0
oklch(93.5% 0.012 231.7)
-
Step 200
200
#CBDCE5
oklch(88.4% 0.022 230.6)
-
Step 300
300
#A7C6D5
oklch(80.9% 0.04 228.7)
-
Step 400
400
#76A9C0
oklch(70.7% 0.064 227.8)
-
Step 500
500
#5093B1
oklch(63.1% 0.082 229.1)
-
Step 600
600
#317D9C
oklch(55.6% 0.088 228.5)
-
Step 700
700
#226986
oklch(49.1% 0.083 229.4)
-
Step 800
800
#1F566D
oklch(42.8% 0.068 229.2)
-
Step 900
900
#204758
oklch(37.7% 0.053 228.9)
-
Step 950
950 (this color)
#00121B
oklch(17% 0.034 228.9)
#00121B 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) | #0D121B | 0.023 |
| Deuteranopia (no green cones) | #090F1B | 0.019 |
| Tritanopia (no blue cones) | #001515 | 0.020 |
| Achromatopsia (no color) | #101010 | 0.034 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #00121B
#00121B
oklch(17% 0.034 228.9)
- #1B0B03
#1B0B03
oklch(17.1% 0.034 51.8)
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 #00121B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Navy #001219 ΔE 0.004
- Almost Black #070D0D ΔE 0.031
- Rich Black #0D1B2A ΔE 0.049
- Dark Navy Blue #00022E ΔE 0.071
- Dark Navy #000435 ΔE 0.072
- Midnight #03012D ΔE 0.073
- Very Dark Blue #000133 ΔE 0.077
- Navy Blue #001146 ΔE 0.086
Use #00121B 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.