#284FAF
Closest named color: Blue Blue (#2242C7). oklch(45.8% 0.16 264.3), rgb(40, 79, 175).
Aa
White text reads best on this color (7.42:1).
About this color
#284FAF is a medium-dark, vivid blue. In OKLCH its lightness is 46%, its chroma 0.160 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Blue Blue (#2242C7), ΔE 0.049 away. White text reads best on it, at 7.42:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | vivid (0.160) |
| Temperature | cool |
| Nearest name | Blue Blue (#2242C7) |
| Black text | 2.82:1 |
| White text | 7.42:1 |
Values
| HEX | #284FAF |
| RGB | rgb(40, 79, 175) |
| HSL | hsl(223, 63%, 42%) |
| OKLCH | oklch(45.8% 0.16 264.3) |
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 #284FAF | 7.42:1 | AAA | Lc -90.2 | Preferred for body text |
| Black text on #284FAF | 2.82:1 | Fails | Lc 18.7 | Dividers and decoration only |
| #284FAF text on white | 7.42:1 | AAA | Lc 85.3 | Fine for body text |
| #284FAF text on black | 2.82:1 | Fails | Lc -16.7 | 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
#E1EAFD
oklch(93.6% 0.028 265.4)
-
Step 200
200
#C8DAFC
oklch(88.6% 0.051 263.2)
-
Step 300
300
#A2C0FE
oklch(80.8% 0.094 264.4)
-
Step 400
400
#719DFD
oklch(70.7% 0.149 264.3)
-
Step 500
500
#4D81FB
oklch(63.1% 0.19 264.3)
-
Step 600
600
#3266EA
oklch(55.5% 0.208 264.3)
-
Step 700
700
#2654CC
oklch(49.1% 0.193 264.3)
-
Step 800
800 (this color)
#284FAF
oklch(45.8% 0.16 264.3)
-
Step 900
900
#1E3C83
oklch(37.8% 0.125 264.1)
-
Step 950
950
#12244C
oklch(27% 0.078 263.8)
#284FAF 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) | #005CB2 | 0.035 |
| Deuteranopia (no green cones) | #004FAD | 0.022 |
| Tritanopia (no blue cones) | #006777 | 0.127 |
| Achromatopsia (no color) | #555555 | 0.160 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #284FAF
#284FAF
oklch(45.8% 0.16 264.3)
- #705200
#705200
oklch(45.8% 0.094 84.1)
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 #284FAF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue Blue #2242C7 ΔE 0.049
- Cobalt #1E488F ΔE 0.056
- Sapphire #2138AB ΔE 0.057
- Dusk Blue #26538D ΔE 0.058
- Blueberry #464196 ΔE 0.059
- Denim Blue #3B5B92 ΔE 0.065
- Majorelle Blue #3F37C9 ΔE 0.067
- Mid Blue #276AB3 ΔE 0.073
Use #284FAF 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.