#233D9C
Closest named color: Sapphire (#2138AB). oklch(40.3% 0.158 267.1), rgb(35, 61, 156).
Aa
White text reads best on this color (9.46:1).
About this color
#233D9C is a dark, vivid blue. In OKLCH its lightness is 40%, its chroma 0.158 and its hue 267°. 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 9.46:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | vivid (0.158) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.21:1 |
| White text | 9.46:1 |
Values
| HEX | #233D9C |
| RGB | rgb(35, 61, 156) |
| HSL | hsl(227, 63%, 37%) |
| OKLCH | oklch(40.3% 0.158 267.1) |
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 #233D9C | 9.46:1 | AAA | Lc -95.7 | Preferred for body text |
| Black text on #233D9C | 2.21:1 | Fails | Lc 12.6 | Not readable |
| #233D9C text on white | 9.46:1 | AAA | Lc 91.3 | Preferred for body text |
| #233D9C text on black | 2.21:1 | Fails | Lc -11.0 | 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 800.
-
Step 50
50
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E2EAFC
oklch(93.6% 0.026 266.6)
-
Step 200
200
#CAD9FC
oklch(88.5% 0.051 267)
-
Step 300
300
#A6BFFD
oklch(80.8% 0.092 267.4)
-
Step 400
400
#779CFC
oklch(70.8% 0.147 266.7)
-
Step 500
500
#567FFA
oklch(63.1% 0.189 267)
-
Step 600
600
#3E64E9
oklch(55.5% 0.205 267.2)
-
Step 700
700
#3152CB
oklch(49.1% 0.191 267.1)
-
Step 800
800 (this color)
#233D9C
oklch(40.3% 0.158 267.1)
-
Step 900
900
#243B82
oklch(37.7% 0.123 266.8)
-
Step 950
950
#15234C
oklch(27% 0.078 266.9)
#233D9C 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) | #004C9F | 0.039 |
| Deuteranopia (no green cones) | #00409A | 0.022 |
| Tritanopia (no blue cones) | #005566 | 0.124 |
| Achromatopsia (no color) | #464646 | 0.158 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #233D9C
#233D9C
oklch(40.3% 0.158 267.1)
- #5C4500
#5C4500
oklch(40.4% 0.083 86.9)
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 #233D9C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.027
- Cobalt #1E488F ΔE 0.037
- Blueberry #464196 ΔE 0.050
- Dark Slate Blue #483D8B ΔE 0.058
- Twilight Blue #0A437A ΔE 0.063
- Dusk Blue #26538D ΔE 0.068
- Light Navy #155084 ΔE 0.069
- Blue Blue #2242C7 ΔE 0.071
Use #233D9C 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.