#123D5D
Closest named color: Prussian Blue (#1D3557). oklch(34.8% 0.073 244.9), rgb(18, 61, 93).
Aa
White text reads best on this color (11.34:1).
About this color
#123D5D is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.073 and its hue 245°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.026 away. White text reads best on it, at 11.34:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.073) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.85:1 |
| White text | 11.34:1 |
Values
| HEX | #123D5D |
| RGB | rgb(18, 61, 93) |
| HSL | hsl(206, 68%, 22%) |
| OKLCH | oklch(34.8% 0.073 244.9) |
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 #123D5D | 11.34:1 | AAA | Lc -99.7 | Preferred for body text |
| Black text on #123D5D | 1.85:1 | Fails | Lc 8.0 | Not readable |
| #123D5D text on white | 11.34:1 | AAA | Lc 95.9 | Preferred for body text |
| #123D5D text on black | 1.85:1 | 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 900.
-
Step 50
50
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E1EBF4
oklch(93.5% 0.016 245.1)
-
Step 200
200
#C9DCEC
oklch(88.5% 0.03 243.4)
-
Step 300
300
#A4C5E2
oklch(80.9% 0.054 245.1)
-
Step 400
400
#71A7D4
oklch(70.8% 0.087 244.6)
-
Step 500
500
#4990C8
oklch(63.2% 0.111 244.7)
-
Step 600
600
#2679B5
oklch(55.6% 0.121 244.8)
-
Step 700
700
#17659C
oklch(49% 0.113 245.3)
-
Step 800
800
#17537E
oklch(42.7% 0.093 244.7)
-
Step 900
900 (this color)
#123D5D
oklch(34.8% 0.073 244.9)
-
Step 950
950
#11293B
oklch(27.1% 0.045 243.2)
#123D5D 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) | #2E3E5E | 0.031 |
| Deuteranopia (no green cones) | #24375C | 0.023 |
| Tritanopia (no blue cones) | #004548 | 0.053 |
| Achromatopsia (no color) | #3A3A3A | 0.073 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #123D5D
#123D5D
oklch(34.8% 0.073 244.9)
- #533107
#533107
oklch(34.8% 0.072 65.6)
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 #123D5D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.026
- Dark Blue Grey #1F3B4D ΔE 0.028
- Midnight Green #073B4C ΔE 0.032
- Marine Blue #01386A ΔE 0.032
- Dark Grey Blue #29465B ΔE 0.040
- Charcoal #264653 ΔE 0.044
- Twilight Blue #0A437A ΔE 0.050
- Marine #042E60 ΔE 0.051
Use #123D5D 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.