#123C9A
Closest named color: Sapphire (#2138AB). oklch(39.3% 0.16 263), rgb(18, 60, 154).
Aa
White text reads best on this color (9.81:1).
About this color
#123C9A is a dark, vivid blue. In OKLCH its lightness is 39%, its chroma 0.160 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.031 away. White text reads best on it, at 9.81:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | vivid (0.160) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.13:1 |
| White text | 9.81:1 |
Values
| HEX | #123C9A |
| RGB | rgb(18, 60, 154) |
| HSL | hsl(221, 79%, 34%) |
| OKLCH | oklch(39.3% 0.16 263) |
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 #123C9A | 9.81:1 | AAA | Lc -96.3 | Preferred for body text |
| Black text on #123C9A | 2.13:1 | Fails | Lc 11.9 | Not readable |
| #123C9A text on white | 9.81:1 | AAA | Lc 92.1 | Preferred for body text |
| #123C9A text on black | 2.13:1 | Fails | Lc -10.3 | 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
#F1F6FF
oklch(97.2% 0.013 262.4)
-
Step 100
100
#DFEAFF
oklch(93.5% 0.031 263.5)
-
Step 200
200
#C6DAFF
oklch(88.5% 0.056 262.8)
-
Step 300
300
#A0C1FF
oklch(80.9% 0.095 262.7)
-
Step 400
400
#6D9EFF
oklch(70.8% 0.152 262.8)
-
Step 500
500
#4681FF
oklch(63.1% 0.198 263.1)
-
Step 600
600
#1A60FF
oklch(55.5% 0.245 263)
-
Step 700
700
#0049E9
oklch(49.1% 0.247 263)
-
Step 800
800
#053DBD
oklch(42.7% 0.206 263.1)
-
Step 900
900 (this color)
#123C9A
oklch(39.3% 0.16 263)
-
Step 950
950
#092157
oklch(26.9% 0.102 263.2)
#123C9A 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) | #004A9D | 0.036 |
| Deuteranopia (no green cones) | #003D98 | 0.009 |
| Tritanopia (no blue cones) | #005465 | 0.122 |
| Achromatopsia (no color) | #434343 | 0.161 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #123C9A
#123C9A
oklch(39.3% 0.16 263)
- #5B4100
#5B4100
oklch(39.4% 0.081 82.8)
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 #123C9A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.031
- Cobalt #1E488F ΔE 0.040
- Twilight Blue #0A437A ΔE 0.058
- Blueberry #464196 ΔE 0.064
- Light Navy #155084 ΔE 0.070
- Dark Slate Blue #483D8B ΔE 0.070
- Dusk Blue #26538D ΔE 0.073
- Indigo Blue #3A18B1 ΔE 0.077
Use #123C9A 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.