#123E5F
Closest named color: Prussian Blue (#1D3557). oklch(35.2% 0.074 245.2), rgb(18, 62, 95).
Aa
White text reads best on this color (11.17:1).
About this color
#123E5F is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.074 and its hue 245°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.029 away. White text reads best on it, at 11.17:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.074) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.88:1 |
| White text | 11.17:1 |
Values
| HEX | #123E5F |
| RGB | rgb(18, 62, 95) |
| HSL | hsl(206, 68%, 22%) |
| OKLCH | oklch(35.2% 0.074 245.2) |
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 #123E5F | 11.17:1 | AAA | Lc -99.3 | Preferred for body text |
| Black text on #123E5F | 1.88:1 | Fails | Lc 8.4 | Not readable |
| #123E5F text on white | 11.17:1 | AAA | Lc 95.5 | Preferred for body text |
| #123E5F text on black | 1.88:1 | 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
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#E1EBF4
oklch(93.5% 0.016 245.1)
-
Step 200
200
#C9DCED
oklch(88.6% 0.031 245.1)
-
Step 300
300
#A3C5E3
oklch(80.9% 0.056 245.2)
-
Step 400
400
#70A7D5
oklch(70.8% 0.089 244.8)
-
Step 500
500
#4790CA
oklch(63.2% 0.114 245)
-
Step 600
600
#2379B7
oklch(55.7% 0.124 245.2)
-
Step 700
700
#14659D
oklch(49% 0.115 245.3)
-
Step 800
800
#15537F
oklch(42.7% 0.095 244.8)
-
Step 900
900 (this color)
#123E5F
oklch(35.2% 0.074 245.2)
-
Step 950
950
#10293C
oklch(27.1% 0.047 243.8)
#123E5F 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) | #2F3F60 | 0.032 |
| Deuteranopia (no green cones) | #24385E | 0.023 |
| Tritanopia (no blue cones) | #00464A | 0.053 |
| Achromatopsia (no color) | #3B3B3B | 0.074 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #123E5F
#123E5F
oklch(35.2% 0.074 245.2)
- #553206
#553206
oklch(35.3% 0.074 65.7)
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 #123E5F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.029
- Dark Blue Grey #1F3B4D ΔE 0.032
- Marine Blue #01386A ΔE 0.032
- Midnight Green #073B4C ΔE 0.035
- Dark Grey Blue #29465B ΔE 0.038
- Charcoal #264653 ΔE 0.043
- Twilight Blue #0A437A ΔE 0.046
- Marine #042E60 ΔE 0.054
Use #123E5F 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.