#233F8A
Closest named color: Cobalt (#1E488F). oklch(39.2% 0.13 265.4), rgb(35, 63, 138).
Aa
White text reads best on this color (9.76:1).
About this color
#233F8A is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.130 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.025 away. White text reads best on it, at 9.76:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.130) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.14:1 |
| White text | 9.76:1 |
Values
| HEX | #233F8A |
| RGB | rgb(35, 63, 138) |
| HSL | hsl(224, 60%, 34%) |
| OKLCH | oklch(39.2% 0.13 265.4) |
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 #233F8A | 9.76:1 | AAA | Lc -96.5 | Preferred for body text |
| Black text on #233F8A | 2.14:1 | Fails | Lc 11.7 | Not readable |
| #233F8A text on white | 9.76:1 | AAA | Lc 92.3 | Preferred for body text |
| #233F8A text on black | 2.14:1 | Fails | Lc -10.2 | 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
#E1EAFD
oklch(93.6% 0.028 265.4)
-
Step 200
200
#C8D9FE
oklch(88.5% 0.054 265.8)
-
Step 300
300
#A3C0FF
oklch(80.9% 0.095 265.2)
-
Step 400
400
#729CFF
oklch(70.6% 0.153 265.4)
-
Step 500
500
#4E7FFF
oklch(63% 0.198 265.3)
-
Step 600
600
#3464EF
oklch(55.6% 0.216 265.3)
-
Step 700
700
#2852D0
oklch(49.2% 0.2 265.3)
-
Step 800
800
#2144A8
oklch(42.7% 0.166 265.2)
-
Step 900
900 (this color)
#233F8A
oklch(39.2% 0.13 265.4)
-
Step 950
950
#13234E
oklch(27% 0.082 265.8)
#233F8A 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) | #09498D | 0.029 |
| Deuteranopia (no green cones) | #003F89 | 0.023 |
| Tritanopia (no blue cones) | #00515E | 0.103 |
| Achromatopsia (no color) | #444444 | 0.130 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #233F8A
#233F8A
oklch(39.2% 0.13 265.4)
- #594100
#594100
oklch(39.1% 0.08 84.7)
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 #233F8A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.025
- Twilight Blue #0A437A ΔE 0.035
- Light Navy #155084 ΔE 0.051
- Dark Slate Blue #483D8B ΔE 0.051
- Blueberry #464196 ΔE 0.053
- Sapphire #2138AB ΔE 0.057
- Dusk Blue #26538D ΔE 0.057
- Deep Sea Blue #015482 ΔE 0.064
Use #233F8A 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.