#23318A
Closest named color: Sapphire (#2138AB). oklch(36.3% 0.148 270.2), rgb(35, 49, 138).
Aa
White text reads best on this color (11.18:1).
About this color
#23318A is a dark, vivid blue. In OKLCH its lightness is 36%, its chroma 0.148 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.057 away. White text reads best on it, at 11.18:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | vivid (0.148) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 1.87:1 |
| White text | 11.18:1 |
Values
| HEX | #23318A |
| RGB | rgb(35, 49, 138) |
| HSL | hsl(232, 60%, 34%) |
| OKLCH | oklch(36.3% 0.148 270.2) |
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 #23318A | 11.18:1 | AAA | Lc -99.1 | Preferred for body text |
| Black text on #23318A | 1.87:1 | Fails | Lc 8.6 | Not readable |
| #23318A text on white | 11.18:1 | AAA | Lc 95.3 | Preferred for body text |
| #23318A text on black | 1.87:1 | Fails | Lc -7.4 | 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 900.
-
Step 50
50
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E2E9FF
oklch(93.5% 0.031 271.7)
-
Step 200
200
#CBD8FF
oklch(88.5% 0.056 270.7)
-
Step 300
300
#A9BEFF
oklch(80.9% 0.095 270.4)
-
Step 400
400
#7C99FF
oklch(70.6% 0.153 270.2)
-
Step 500
500
#5E7BFF
oklch(63.1% 0.198 270.4)
-
Step 600
600
#4359FF
oklch(55.7% 0.244 270.2)
-
Step 700
700
#3646DF
oklch(49% 0.229 270.2)
-
Step 800
800
#2C3BB4
oklch(42.6% 0.19 270.3)
-
Step 900
900 (this color)
#23318A
oklch(36.3% 0.148 270.2)
-
Step 950
950
#162053
oklch(26.9% 0.093 270.5)
#23318A 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) | #00408D | 0.040 |
| Deuteranopia (no green cones) | #003688 | 0.027 |
| Tritanopia (no blue cones) | #004858 | 0.118 |
| Achromatopsia (no color) | #3B3B3B | 0.148 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #23318A
#23318A
oklch(36.3% 0.148 270.2)
- #4D3C00
#4D3C00
oklch(36.4% 0.074 90.7)
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 #23318A, closest first.
No curated palette has a color within ΔE 0.04 of #23318A.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.057
- Twilight Blue #0A437A ΔE 0.058
- Cobalt #1E488F ΔE 0.060
- Royal #0C1793 ΔE 0.061
- Marine Blue #01386A ΔE 0.065
- Dark Slate Blue #483D8B ΔE 0.067
- Blueberry #464196 ΔE 0.072
- Midnight Blue #191970 ΔE 0.076
Use #23318A 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.