#123EB9
Closest named color: Sapphire (#2138AB). oklch(42.7% 0.199 264.1), rgb(18, 62, 185).
Aa
White text reads best on this color (8.69:1).
About this color
#123EB9 is a dark, vivid blue. In OKLCH its lightness is 43%, its chroma 0.199 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.027 away. White text reads best on it, at 8.69:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | vivid (0.199) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.41:1 |
| White text | 8.69:1 |
Values
| HEX | #123EB9 |
| RGB | rgb(18, 62, 185) |
| HSL | hsl(224, 82%, 40%) |
| OKLCH | oklch(42.7% 0.199 264.1) |
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 #123EB9 | 8.69:1 | AAA | Lc -93.4 | Preferred for body text |
| Black text on #123EB9 | 2.41:1 | Fails | Lc 15.1 | Dividers and decoration only |
| #123EB9 text on white | 8.69:1 | AAA | Lc 88.9 | Fine for body text |
| #123EB9 text on black | 2.41:1 | Fails | Lc -13.4 | 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 800.
-
Step 50
50
#F1F6FF
oklch(97.2% 0.013 262.4)
-
Step 100
100
#E0EAFF
oklch(93.6% 0.03 265.3)
-
Step 200
200
#C7DAFF
oklch(88.6% 0.055 263.7)
-
Step 300
300
#A2C0FF
oklch(80.9% 0.096 264.7)
-
Step 400
400
#709DFF
oklch(70.7% 0.152 264.2)
-
Step 500
500
#4A80FF
oklch(63.1% 0.198 264.2)
-
Step 600
600
#245FFF
oklch(55.6% 0.245 264.2)
-
Step 700
700
#1449E5
oklch(49% 0.24 264.2)
-
Step 800
800 (this color)
#123EB9
oklch(42.7% 0.199 264.1)
-
Step 900
900
#143792
oklch(37.6% 0.155 264.1)
-
Step 950
950
#0D2255
oklch(27.1% 0.097 264.1)
#123EB9 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) | #0053BD | 0.049 |
| Deuteranopia (no green cones) | #0044B7 | 0.014 |
| Tritanopia (no blue cones) | #006076 | 0.152 |
| Achromatopsia (no color) | #4B4B4B | 0.199 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #123EB9
#123EB9
oklch(42.7% 0.199 264.1)
- #654A00
#654A00
oklch(42.7% 0.087 84.5)
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 #123EB9, closest first.
No curated palette has a color within ΔE 0.04 of #123EB9.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.027
- Blue Blue #2242C7 ΔE 0.029
- Majorelle Blue #3F37C9 ΔE 0.052
- Indigo Blue #3A18B1 ΔE 0.070
- True Blue #010FCC ΔE 0.072
- Cobalt #1E488F ΔE 0.074
- Ultramarine Blue #1805DB ΔE 0.078
- Blue With A Hint Of Purple #533CC6 ΔE 0.079
Use #123EB9 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.