#121D58
Closest named color: Midnight Blue (#191970). oklch(26.5% 0.107 269.4), rgb(18, 29, 88).
Aa
White text reads best on this color (15.64:1).
About this color
#121D58 is a dark, moderately saturated blue. In OKLCH its lightness is 27%, its chroma 0.107 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Midnight Blue (#191970), ΔE 0.044 away. White text reads best on it, at 15.64:1.
| Hue family | Blues |
| Lightness | dark (27%) |
| Chroma | moderately saturated (0.107) |
| Temperature | cool |
| Nearest name | Midnight Blue (#191970) |
| Black text | 1.34:1 |
| White text | 15.64:1 |
Values
| HEX | #121D58 |
| RGB | rgb(18, 29, 88) |
| HSL | hsl(231, 66%, 21%) |
| OKLCH | oklch(26.5% 0.107 269.4) |
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 #121D58 | 15.64:1 | AAA | Lc -104.9 | Preferred for body text |
| Black text on #121D58 | 1.34:1 | Fails | Lc 0.0 | Not readable |
| #121D58 text on white | 15.64:1 | AAA | Lc 102.2 | Preferred for body text |
| #121D58 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
#313CF1
oklch(49.2% 0.261 269.5)
-
Step 800
800
#2734C2
oklch(42.7% 0.216 269.4)
-
Step 900
900
#223199
oklch(37.7% 0.169 269.6)
-
Step 950
950 (this color)
#121D58
oklch(26.5% 0.107 269.4)
#121D58 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) | #00275A | 0.029 |
| Deuteranopia (no green cones) | #002057 | 0.018 |
| Tritanopia (no blue cones) | #002C37 | 0.084 |
| Achromatopsia (no color) | #232323 | 0.107 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #121D58
#121D58
oklch(26.5% 0.107 269.4)
- #302300
#302300
oklch(26.4% 0.054 87.8)
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 #121D58, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Midnight Blue #191970 ΔE 0.044
- Dark Indigo #1F0954 ΔE 0.045
- Marine #042E60 ΔE 0.049
- Darkblue #030764 ΔE 0.052
- Navy Blue #001146 ΔE 0.056
- Dark Royal Blue #02066F ΔE 0.060
- Oxford Blue #1B263B ΔE 0.065
- Deep Blue #040273 ΔE 0.066
Use #121D58 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.