#283EB2
Closest named color: Sapphire (#2138AB). oklch(42.8% 0.185 268.6), rgb(40, 62, 178).
Aa
White text reads best on this color (8.67:1).
About this color
#283EB2 is a dark, vivid blue. In OKLCH its lightness is 43%, its chroma 0.185 and its hue 269°. 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 8.67:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | vivid (0.185) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.42:1 |
| White text | 8.67:1 |
Values
| HEX | #283EB2 |
| RGB | rgb(40, 62, 178) |
| HSL | hsl(230, 63%, 43%) |
| OKLCH | oklch(42.8% 0.185 268.6) |
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 #283EB2 | 8.67:1 | AAA | Lc -93.6 | Preferred for body text |
| Black text on #283EB2 | 2.42:1 | Fails | Lc 15.0 | Not readable |
| #283EB2 text on white | 8.67:1 | AAA | Lc 89.0 | Fine for body text |
| #283EB2 text on black | 2.42:1 | Fails | Lc -13.2 | 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 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
#CAD8FF
oklch(88.4% 0.056 269.7)
-
Step 300
300
#A7BFFF
oklch(81% 0.095 268.4)
-
Step 400
400
#799AFF
oklch(70.6% 0.153 268.6)
-
Step 500
500
#597DFF
oklch(63.2% 0.197 268.6)
-
Step 600
600
#3D5CFC
oklch(55.6% 0.239 268.5)
-
Step 700
700
#314ADC
oklch(49.2% 0.222 268.6)
-
Step 800
800 (this color)
#283EB2
oklch(42.8% 0.185 268.6)
-
Step 900
900
#23378C
oklch(37.7% 0.143 268.5)
-
Step 950
950
#142152
oklch(26.9% 0.091 268.4)
#283EB2 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) | #0052B6 | 0.048 |
| Deuteranopia (no green cones) | #0045B0 | 0.026 |
| Tritanopia (no blue cones) | #005D72 | 0.145 |
| Achromatopsia (no color) | #4B4B4B | 0.185 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #283EB2
#283EB2
oklch(42.8% 0.185 268.6)
- #634C00
#634C00
oklch(42.9% 0.088 88.6)
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 #283EB2, closest first.
No curated palette has a color within ΔE 0.04 of #283EB2.
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 0.035
- Majorelle Blue #3F37C9 ΔE 0.046
- Blueberry #464196 ΔE 0.061
- Indigo Blue #3A18B1 ΔE 0.063
- Cobalt #1E488F ΔE 0.063
- Blue With A Hint Of Purple #533CC6 ΔE 0.067
- Blurple #5539CC ΔE 0.075
Use #283EB2 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.