#234DAB
Closest named color: Cobalt (#1E488F). oklch(44.9% 0.158 263.3), rgb(35, 77, 171).
Aa
White text reads best on this color (7.71:1).
About this color
#234DAB is a dark, vivid blue. In OKLCH its lightness is 45%, its chroma 0.158 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.047 away. White text reads best on it, at 7.71:1.
| Hue family | Blues |
| Lightness | dark (45%) |
| Chroma | vivid (0.158) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.72:1 |
| White text | 7.71:1 |
Values
| HEX | #234DAB |
| RGB | rgb(35, 77, 171) |
| HSL | hsl(221, 66%, 40%) |
| OKLCH | oklch(44.9% 0.158 263.3) |
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 #234DAB | 7.71:1 | AAA | Lc -91.1 | Preferred for body text |
| Black text on #234DAB | 2.72:1 | Fails | Lc 17.7 | Dividers and decoration only |
| #234DAB text on white | 7.71:1 | AAA | Lc 86.3 | Fine for body text |
| #234DAB text on black | 2.72:1 | Fails | Lc -15.8 | Dividers and decoration only |
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
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E1EAFC
oklch(93.6% 0.026 264.4)
-
Step 200
200
#C8DAFC
oklch(88.6% 0.051 263.2)
-
Step 300
300
#A2C1FD
oklch(81% 0.092 263.3)
-
Step 400
400
#6F9EFC
oklch(70.7% 0.147 263)
-
Step 500
500
#4A82FA
oklch(63.1% 0.189 263.2)
-
Step 600
600
#2E67E9
oklch(55.5% 0.206 263.3)
-
Step 700
700
#2255CB
oklch(49.1% 0.191 263.4)
-
Step 800
800 (this color)
#234DAB
oklch(44.9% 0.158 263.3)
-
Step 900
900
#1D3C82
oklch(37.6% 0.124 263.6)
-
Step 950
950
#11244C
oklch(27% 0.078 263.1)
#234DAB 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) | #0059AE | 0.032 |
| Deuteranopia (no green cones) | #004DA9 | 0.018 |
| Tritanopia (no blue cones) | #006474 | 0.123 |
| Achromatopsia (no color) | #535353 | 0.158 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #234DAB
#234DAB
oklch(44.9% 0.158 263.3)
- #6D4F00
#6D4F00
oklch(44.8% 0.092 83.3)
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 #234DAB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.047
- Sapphire #2138AB ΔE 0.051
- Blue Blue #2242C7 ΔE 0.051
- Dusk Blue #26538D ΔE 0.054
- Blueberry #464196 ΔE 0.056
- Denim Blue #3B5B92 ΔE 0.066
- Light Navy #155084 ΔE 0.067
- Majorelle Blue #3F37C9 ΔE 0.070
Use #234DAB 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.