#123A77
Closest named color: Twilight Blue (#0A437A). oklch(35.9% 0.114 259.1), rgb(18, 58, 119).
Aa
White text reads best on this color (11.06:1).
About this color
#123A77 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.114 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.026 away. White text reads best on it, at 11.06:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.114) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.89:1 |
| White text | 11.06:1 |
Values
| HEX | #123A77 |
| RGB | rgb(18, 58, 119) |
| HSL | hsl(216, 74%, 27%) |
| OKLCH | oklch(35.9% 0.114 259.1) |
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 #123A77 | 11.06:1 | AAA | Lc -99.0 | Preferred for body text |
| Black text on #123A77 | 1.89:1 | Fails | Lc 8.7 | Not readable |
| #123A77 text on white | 11.06:1 | AAA | Lc 95.2 | Preferred for body text |
| #123A77 text on black | 1.89:1 | Fails | Lc -7.5 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E0EBFB
oklch(93.7% 0.025 257.6)
-
Step 200
200
#C7DBF9
oklch(88.6% 0.047 258.4)
-
Step 300
300
#A0C2F8
oklch(80.9% 0.085 259.5)
-
Step 400
400
#6BA1F5
oklch(70.8% 0.136 258.9)
-
Step 500
500
#4286F1
oklch(63.1% 0.175 259.2)
-
Step 600
600
#206DDF
oklch(55.6% 0.189 259)
-
Step 700
700
#125AC2
oklch(49% 0.177 259.1)
-
Step 800
800
#134A9D
oklch(42.6% 0.147 259.3)
-
Step 900
900 (this color)
#123A77
oklch(35.9% 0.114 259.1)
-
Step 950
950
#0F2549
oklch(26.9% 0.073 259.8)
#123A77 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) | #154179 | 0.021 |
| Deuteranopia (no green cones) | #003876 | 0.013 |
| Tritanopia (no blue cones) | #004952 | 0.089 |
| Achromatopsia (no color) | #3C3C3C | 0.114 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #123A77
#123A77
oklch(35.9% 0.114 259.1)
- #513700
#513700
oklch(35.8% 0.074 79.2)
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 #123A77, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.026
- Marine Blue #01386A ΔE 0.026
- Marine #042E60 ΔE 0.054
- Prussian Blue #1D3557 ΔE 0.056
- Cobalt #1E488F ΔE 0.057
- Light Navy #155084 ΔE 0.067
- Dark Grey Blue #29465B ΔE 0.071
- Dark Blue Grey #1F3B4D ΔE 0.075
Use #123A77 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.