#284397
Closest named color: Cobalt (#1E488F). oklch(41.4% 0.142 266.6), rgb(40, 67, 151).
Aa
White text reads best on this color (8.97:1).
About this color
#284397 is a dark, vivid blue. In OKLCH its lightness is 41%, its chroma 0.142 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.021 away. White text reads best on it, at 8.97:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | vivid (0.142) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.33:1 |
| White text | 8.97:1 |
Values
| HEX | #284397 |
| RGB | rgb(40, 67, 151) |
| HSL | hsl(225, 58%, 37%) |
| OKLCH | oklch(41.4% 0.142 266.6) |
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 #284397 | 8.97:1 | AAA | Lc -94.6 | Preferred for body text |
| Black text on #284397 | 2.33:1 | Fails | Lc 13.8 | Not readable |
| #284397 text on white | 8.97:1 | AAA | Lc 90.2 | Preferred for body text |
| #284397 text on black | 2.33:1 | Fails | Lc -12.1 | 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
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E2EAFB
oklch(93.6% 0.025 265.6)
-
Step 200
200
#CBD9F9
oklch(88.5% 0.047 266.7)
-
Step 300
300
#A8C0F7
oklch(80.9% 0.083 266.3)
-
Step 400
400
#7B9DF3
oklch(70.7% 0.132 266.7)
-
Step 500
500
#5A82EF
oklch(63.1% 0.169 266.5)
-
Step 600
600
#4268DD
oklch(55.5% 0.184 266.7)
-
Step 700
700
#3456C0
oklch(49.1% 0.171 266.6)
-
Step 800
800 (this color)
#284397
oklch(41.4% 0.142 266.6)
-
Step 900
900
#273D7B
oklch(37.8% 0.109 266.5)
-
Step 950
950
#172448
oklch(27% 0.069 266.8)
#284397 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) | #004F9A | 0.035 |
| Deuteranopia (no green cones) | #004495 | 0.026 |
| Tritanopia (no blue cones) | #005766 | 0.113 |
| Achromatopsia (no color) | #494949 | 0.142 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #284397
#284397
oklch(41.4% 0.142 266.6)
- #5F4700
#5F4700
oklch(41.2% 0.084 86.4)
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 #284397, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.021
- Blueberry #464196 ΔE 0.040
- Sapphire #2138AB ΔE 0.043
- Dark Slate Blue #483D8B ΔE 0.048
- Dusk Blue #26538D ΔE 0.049
- Light Navy #155084 ΔE 0.052
- Twilight Blue #0A437A ΔE 0.055
- Deep Sea Blue #015482 ΔE 0.065
Use #284397 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.