#12339C
Closest named color: Sapphire (#2138AB). oklch(37.8% 0.174 265), rgb(18, 51, 156).
Aa
White text reads best on this color (10.60:1).
About this color
#12339C is a dark, vivid blue. In OKLCH its lightness is 38%, its chroma 0.174 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.032 away. White text reads best on it, at 10.60:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | vivid (0.174) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 1.97:1 |
| White text | 10.60:1 |
Values
| HEX | #12339C |
| RGB | rgb(18, 51, 156) |
| HSL | hsl(226, 79%, 34%) |
| OKLCH | oklch(37.8% 0.174 265) |
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 #12339C | 10.60:1 | AAA | Lc -97.8 | Preferred for body text |
| Black text on #12339C | 1.97:1 | Fails | Lc 10.2 | Not readable |
| #12339C text on white | 10.60:1 | AAA | Lc 93.7 | Preferred for body text |
| #12339C text on black | 1.97:1 | Fails | Lc -8.8 | 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
#E0EAFF
oklch(93.6% 0.03 265.3)
-
Step 200
200
#C7D9FF
oklch(88.4% 0.056 265.2)
-
Step 300
300
#A3C0FF
oklch(80.9% 0.095 265.2)
-
Step 400
400
#719CFF
oklch(70.6% 0.153 265)
-
Step 500
500
#4D80FF
oklch(63.2% 0.197 264.8)
-
Step 600
600
#2A5EFF
oklch(55.6% 0.245 265.1)
-
Step 700
700
#133EF6
oklch(49.1% 0.27 265)
-
Step 800
800
#1036C6
oklch(42.7% 0.223 265)
-
Step 900
900 (this color)
#12339C
oklch(37.8% 0.174 265)
-
Step 950
950
#0B1F5B
oklch(26.9% 0.111 265.2)
#12339C 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) | #00459F | 0.043 |
| Deuteranopia (no green cones) | #00389A | 0.013 |
| Tritanopia (no blue cones) | #005063 | 0.134 |
| Achromatopsia (no color) | #3F3F3F | 0.174 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #12339C
#12339C
oklch(37.8% 0.174 265)
- #553E00
#553E00
oklch(37.9% 0.078 84.8)
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 #12339C, closest first.
No curated palette has a color within ΔE 0.04 of #12339C.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.032
- Royal #0C1793 ΔE 0.058
- Cobalt #1E488F ΔE 0.061
- Indigo Blue #3A18B1 ΔE 0.065
- Ultramarine #2000B1 ΔE 0.065
- Cobalt Blue #030AA7 ΔE 0.065
- Twilight Blue #0A437A ΔE 0.072
- Blueberry #464196 ΔE 0.078
Use #12339C 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.