#121F5D
Closest named color: Midnight Blue (#191970). oklch(27.4% 0.112 268.6), rgb(18, 31, 93).
Aa
White text reads best on this color (15.21:1).
About this color
#121F5D is a dark, moderately saturated blue. In OKLCH its lightness is 27%, its chroma 0.112 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Midnight Blue (#191970), ΔE 0.036 away. White text reads best on it, at 15.21:1.
| Hue family | Blues |
| Lightness | dark (27%) |
| Chroma | moderately saturated (0.112) |
| Temperature | cool |
| Nearest name | Midnight Blue (#191970) |
| Black text | 1.37:1 |
| White text | 15.21:1 |
Values
| HEX | #121F5D |
| RGB | rgb(18, 31, 93) |
| HSL | hsl(230, 68%, 22%) |
| OKLCH | oklch(27.4% 0.112 268.6) |
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 #121F5D | 15.21:1 | AAA | Lc -104.5 | Preferred for body text |
| Black text on #121F5D | 1.37:1 | Fails | Lc 0.0 | Not readable |
| #121F5D text on white | 15.21:1 | AAA | Lc 101.7 | Preferred for body text |
| #121F5D text on black | 1.37:1 | 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
#F1F5FF
oklch(97% 0.014 268.5)
-
Step 100
100
#E1EAFF
oklch(93.7% 0.03 267.2)
-
Step 200
200
#CAD8FF
oklch(88.4% 0.056 269.7)
-
Step 300
300
#A7BFFF
oklch(81% 0.095 268.4)
-
Step 400
400
#799AFF
oklch(70.6% 0.153 268.6)
-
Step 500
500
#597DFF
oklch(63.2% 0.197 268.6)
-
Step 600
600
#3C5AFF
oklch(55.5% 0.245 268.6)
-
Step 700
700
#2C37F7
oklch(49% 0.273 268.6)
-
Step 800
800
#2331C8
oklch(42.7% 0.227 268.5)
-
Step 900
900
#1E309D
oklch(37.8% 0.176 268.4)
-
Step 950
950 (this color)
#121F5D
oklch(27.4% 0.112 268.6)
#121F5D 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) | #00295F | 0.028 |
| Deuteranopia (no green cones) | #00225C | 0.017 |
| Tritanopia (no blue cones) | #002F3A | 0.089 |
| Achromatopsia (no color) | #262626 | 0.112 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #121F5D
#121F5D
oklch(27.4% 0.112 268.6)
- #332500
#332500
oklch(27.4% 0.056 87.1)
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 #121F5D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Midnight Blue #191970 ΔE 0.036
- Marine #042E60 ΔE 0.042
- Dark Indigo #1F0954 ΔE 0.051
- Darkblue #030764 ΔE 0.054
- Dark Royal Blue #02066F ΔE 0.058
- Deep Blue #040273 ΔE 0.063
- Navy Blue #001146 ΔE 0.066
- Oxford Blue #1B263B ΔE 0.070
Use #121F5D 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.