#123F5D
Closest named color: Dark Blue Grey (#1F3B4D). oklch(35.3% 0.071 242.3), rgb(18, 63, 93).
Aa
White text reads best on this color (11.08:1).
About this color
#123F5D is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.071 and its hue 242°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.029 away. White text reads best on it, at 11.08:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.071) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.89:1 |
| White text | 11.08:1 |
Values
| HEX | #123F5D |
| RGB | rgb(18, 63, 93) |
| HSL | hsl(204, 68%, 22%) |
| OKLCH | oklch(35.3% 0.071 242.3) |
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 #123F5D | 11.08:1 | AAA | Lc -99.2 | Preferred for body text |
| Black text on #123F5D | 1.89:1 | Fails | Lc 8.6 | Not readable |
| #123F5D text on white | 11.08:1 | AAA | Lc 95.3 | Preferred for body text |
| #123F5D text on black | 1.89:1 | Fails | Lc -7.3 | 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
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#E1EBF3
oklch(93.5% 0.015 241.8)
-
Step 200
200
#C9DCEB
oklch(88.5% 0.029 241.6)
-
Step 300
300
#A3C5E1
oklch(80.8% 0.054 243.3)
-
Step 400
400
#70A7D1
oklch(70.6% 0.085 242.3)
-
Step 500
500
#4691C6
oklch(63.2% 0.109 242.1)
-
Step 600
600
#227AB2
oklch(55.6% 0.118 242.1)
-
Step 700
700
#126699
oklch(49% 0.11 242.4)
-
Step 800
800
#14547C
oklch(42.7% 0.091 241.8)
-
Step 900
900 (this color)
#123F5D
oklch(35.3% 0.071 242.3)
-
Step 950
950
#10293A
oklch(27% 0.044 240.8)
#123F5D 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) | #31405E | 0.034 |
| Deuteranopia (no green cones) | #27395C | 0.026 |
| Tritanopia (no blue cones) | #00464A | 0.047 |
| Achromatopsia (no color) | #3C3C3C | 0.071 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #123F5D
#123F5D
oklch(35.3% 0.071 242.3)
- #55320D
#55320D
oklch(35.3% 0.071 62.7)
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 #123F5D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.029
- Prussian Blue #1D3557 ΔE 0.031
- Midnight Green #073B4C ΔE 0.033
- Dark Grey Blue #29465B ΔE 0.035
- Marine Blue #01386A ΔE 0.037
- Charcoal #264653 ΔE 0.038
- Twilight Blue #0A437A ΔE 0.049
- Gunmetal #293241 ΔE 0.058
Use #123F5D 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.