#121840
Closest named color: Navy Blue (#001146). oklch(23.1% 0.076 272.6), rgb(18, 24, 64).
Aa
White text reads best on this color (17.06:1).
About this color
#121840 is a very dark, moderately saturated blue. In OKLCH its lightness is 23%, its chroma 0.076 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Navy Blue (#001146), ΔE 0.037 away. White text reads best on it, at 17.06:1.
| Hue family | Blues |
| Lightness | very dark (23%) |
| Chroma | moderately saturated (0.076) |
| Temperature | cool |
| Nearest name | Navy Blue (#001146) |
| Black text | 1.23:1 |
| White text | 17.06:1 |
Values
| HEX | #121840 |
| RGB | rgb(18, 24, 64) |
| HSL | hsl(232, 56%, 16%) |
| OKLCH | oklch(23.1% 0.076 272.6) |
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 #121840 | 17.06:1 | AAA | Lc -106.2 | Preferred for body text |
| Black text on #121840 | 1.23:1 | Fails | Lc 0.0 | Not readable |
| #121840 text on white | 17.06:1 | AAA | Lc 103.8 | Preferred for body text |
| #121840 text on black | 1.23:1 | 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
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E4E9FC
oklch(93.6% 0.026 274.1)
-
Step 200
200
#CED8FB
oklch(88.6% 0.049 272.8)
-
Step 300
300
#ADBDFB
oklch(80.8% 0.09 273.1)
-
Step 400
400
#8399FA
oklch(70.8% 0.144 272.6)
-
Step 500
500
#667CF7
oklch(63.2% 0.184 272.5)
-
Step 600
600
#5061E6
oklch(55.6% 0.2 272.6)
-
Step 700
700
#414FC8
oklch(49.1% 0.187 272.4)
-
Step 800
800
#3642A1
oklch(42.8% 0.153 272.7)
-
Step 900
900
#2E3980
oklch(37.7% 0.12 272.7)
-
Step 950
950 (this color)
#121840
oklch(23.1% 0.076 272.6)
#121840 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) | #001E41 | 0.025 |
| Deuteranopia (no green cones) | #001A3F | 0.022 |
| Tritanopia (no blue cones) | #002129 | 0.063 |
| Achromatopsia (no color) | #1C1C1C | 0.076 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #121840
#121840
oklch(23.1% 0.076 272.6)
- #251C00
#251C00
oklch(23.1% 0.047 92)
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 #121840, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Navy Blue #001146 ΔE 0.037
- Rich Black #0D1B2A ΔE 0.047
- Dark Indigo #1F0954 ΔE 0.052
- Oxford Blue #1B263B ΔE 0.052
- Dark #1B2431 ΔE 0.057
- Night Blue #040348 ΔE 0.060
- Midnight Purple #280137 ΔE 0.070
- Jet #212529 ΔE 0.074
Use #121840 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.