#284FCB
Closest named color: Blue Blue (#2242C7). oklch(48.2% 0.197 265.7), rgb(40, 79, 203).
Aa
White text reads best on this color (6.83:1).
About this color
#284FCB is a medium-dark, vivid blue. In OKLCH its lightness is 48%, its chroma 0.197 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Blue Blue (#2242C7), ΔE 0.032 away. White text reads best on it, at 6.83:1.
| Hue family | Blues |
| Lightness | medium-dark (48%) |
| Chroma | vivid (0.197) |
| Temperature | cool |
| Nearest name | Blue Blue (#2242C7) |
| Black text | 3.07:1 |
| White text | 6.83:1 |
Values
| HEX | #284FCB |
| RGB | rgb(40, 79, 203) |
| HSL | hsl(226, 67%, 48%) |
| OKLCH | oklch(48.2% 0.197 265.7) |
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 #284FCB | 6.83:1 | AA | Lc -88.0 | Fine for body text |
| Black text on #284FCB | 3.07:1 | AA large text | Lc 21.1 | Dividers and decoration only |
| #284FCB text on white | 6.83:1 | AA | Lc 82.9 | Fine for body text |
| #284FCB text on black | 3.07:1 | AA large text | Lc -19.0 | 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 700.
-
Step 50
50
#F1F5FE
oklch(97% 0.013 266.7)
-
Step 100
100
#E1EAFD
oklch(93.6% 0.028 265.4)
-
Step 200
200
#C9D9FD
oklch(88.5% 0.053 266.4)
-
Step 300
300
#A3C0FF
oklch(80.9% 0.095 265.2)
-
Step 400
400
#739CFF
oklch(70.7% 0.152 265.7)
-
Step 500
500
#507FFE
oklch(63.1% 0.196 265.7)
-
Step 600
600
#3764ED
oklch(55.5% 0.212 265.8)
-
Step 700
700 (this color)
#284FCB
oklch(48.2% 0.197 265.7)
-
Step 800
800
#2344A7
oklch(42.7% 0.164 265.6)
-
Step 900
900
#213B84
oklch(37.8% 0.127 265.8)
-
Step 950
950
#13234D
oklch(26.9% 0.08 265.6)
#284FCB 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) | #0062CF | 0.045 |
| Deuteranopia (no green cones) | #0053C9 | 0.020 |
| Tritanopia (no blue cones) | #006F85 | 0.153 |
| Achromatopsia (no color) | #5B5B5B | 0.197 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #284FCB
#284FCB
oklch(48.2% 0.197 265.7)
- #775900
#775900
oklch(48.2% 0.099 85.7)
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 #284FCB, closest first.
No curated palette has a color within ΔE 0.04 of #284FCB.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue Blue #2242C7 ΔE 0.032
- Majorelle Blue #3F37C9 ΔE 0.051
- Warm Blue #4B57DB ΔE 0.052
- Azul #1D5DEC ΔE 0.060
- Blue With A Hint Of Purple #533CC6 ΔE 0.061
- Blurple #5539CC ΔE 0.065
- Sapphire #2138AB ΔE 0.076
- Neon Blue #4361EE ΔE 0.077
Use #284FCB 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.