#233DB5
Closest named color: Sapphire (#2138AB). oklch(42.7% 0.191 267.4), rgb(35, 61, 181).
Aa
White text reads best on this color (8.72:1).
About this color
#233DB5 is a dark, vivid blue. In OKLCH its lightness is 43%, its chroma 0.191 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.021 away. White text reads best on it, at 8.72:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | vivid (0.191) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.40:1 |
| White text | 8.72:1 |
Values
| HEX | #233DB5 |
| RGB | rgb(35, 61, 181) |
| HSL | hsl(229, 68%, 42%) |
| OKLCH | oklch(42.7% 0.191 267.4) |
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 #233DB5 | 8.72:1 | AAA | Lc -93.7 | Preferred for body text |
| Black text on #233DB5 | 2.40:1 | Fails | Lc 14.9 | Not readable |
| #233DB5 text on white | 8.72:1 | AAA | Lc 89.1 | Fine for body text |
| #233DB5 text on black | 2.40:1 | Fails | Lc -13.1 | 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
#F1F5FF
oklch(97% 0.014 268.5)
-
Step 100
100
#E1EAFF
oklch(93.7% 0.03 267.2)
-
Step 200
200
#C9D9FF
oklch(88.6% 0.055 267.2)
-
Step 300
300
#A5BFFF
oklch(80.9% 0.095 267.2)
-
Step 400
400
#779BFF
oklch(70.7% 0.152 267.5)
-
Step 500
500
#557EFF
oklch(63.2% 0.197 267.3)
-
Step 600
600
#375CFF
oklch(55.6% 0.244 267.4)
-
Step 700
700
#2B49E0
oklch(49.2% 0.23 267.5)
-
Step 800
800 (this color)
#233DB5
oklch(42.7% 0.191 267.4)
-
Step 900
900
#20378F
oklch(37.8% 0.148 267.4)
-
Step 950
950
#122154
oklch(27% 0.095 267.3)
#233DB5 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) | #0052B9 | 0.049 |
| Deuteranopia (no green cones) | #0044B3 | 0.022 |
| Tritanopia (no blue cones) | #005D73 | 0.148 |
| Achromatopsia (no color) | #4B4B4B | 0.191 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #233DB5
#233DB5
oklch(42.7% 0.191 267.4)
- #634B00
#634B00
oklch(42.6% 0.087 87.5)
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 #233DB5, closest first.
No curated palette has a color within ΔE 0.04 of #233DB5.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.021
- Blue Blue #2242C7 ΔE 0.031
- Majorelle Blue #3F37C9 ΔE 0.046
- Indigo Blue #3A18B1 ΔE 0.063
- Cobalt #1E488F ΔE 0.068
- Blueberry #464196 ΔE 0.069
- Blue With A Hint Of Purple #533CC6 ΔE 0.070
- Blurple #5539CC ΔE 0.077
Use #233DB5 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.