#121D59
Closest named color: Midnight Blue (#191970). oklch(26.6% 0.108 269.4), rgb(18, 29, 89).
Aa
White text reads best on this color (15.60:1).
About this color
#121D59 is a dark, moderately saturated blue. In OKLCH its lightness is 27%, its chroma 0.108 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Midnight Blue (#191970), ΔE 0.042 away. White text reads best on it, at 15.60:1.
| Hue family | Blues |
| Lightness | dark (27%) |
| Chroma | moderately saturated (0.108) |
| Temperature | cool |
| Nearest name | Midnight Blue (#191970) |
| Black text | 1.34:1 |
| White text | 15.60:1 |
Values
| HEX | #121D59 |
| RGB | rgb(18, 29, 89) |
| HSL | hsl(231, 66%, 21%) |
| OKLCH | oklch(26.6% 0.108 269.4) |
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 #121D59 | 15.60:1 | AAA | Lc -104.9 | Preferred for body text |
| Black text on #121D59 | 1.34:1 | Fails | Lc 0.0 | Not readable |
| #121D59 text on white | 15.60:1 | AAA | Lc 102.2 | Preferred for body text |
| #121D59 text on black | 1.34:1 | 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
#F2F5FF
oklch(97.1% 0.014 272.7)
-
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
#A8BEFF
oklch(80.9% 0.096 269.8)
-
Step 400
400
#7B9AFF
oklch(70.8% 0.152 269.4)
-
Step 500
500
#5B7CFF
oklch(63.1% 0.198 269.4)
-
Step 600
600
#405AFF
oklch(55.7% 0.244 269.4)
-
Step 700
700
#303AF3
oklch(49.1% 0.265 269.3)
-
Step 800
800
#2733C4
oklch(42.7% 0.219 269.4)
-
Step 900
900
#21309A
oklch(37.6% 0.171 269.4)
-
Step 950
950 (this color)
#121D59
oklch(26.6% 0.108 269.4)
#121D59 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) | #00275B | 0.029 |
| Deuteranopia (no green cones) | #002058 | 0.018 |
| Tritanopia (no blue cones) | #002C38 | 0.084 |
| Achromatopsia (no color) | #242424 | 0.108 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #121D59
#121D59
oklch(26.6% 0.108 269.4)
- #302400
#302400
oklch(26.7% 0.055 89.9)
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 #121D59, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Midnight Blue #191970 ΔE 0.042
- Dark Indigo #1F0954 ΔE 0.045
- Marine #042E60 ΔE 0.048
- Darkblue #030764 ΔE 0.052
- Navy Blue #001146 ΔE 0.057
- Dark Royal Blue #02066F ΔE 0.059
- Deep Blue #040273 ΔE 0.065
- Oxford Blue #1B263B ΔE 0.066
Use #121D59 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.