#283A9E
Closest named color: Sapphire (#2138AB). oklch(40.2% 0.163 269.6), rgb(40, 58, 158).
Aa
White text reads best on this color (9.59:1).
About this color
#283A9E is a dark, vivid blue. In OKLCH its lightness is 40%, its chroma 0.163 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.023 away. White text reads best on it, at 9.59:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | vivid (0.163) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.18:1 |
| White text | 9.59:1 |
Values
| HEX | #283A9E |
| RGB | rgb(40, 58, 158) |
| HSL | hsl(231, 60%, 39%) |
| OKLCH | oklch(40.2% 0.163 269.6) |
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 #283A9E | 9.59:1 | AAA | Lc -95.9 | Preferred for body text |
| Black text on #283A9E | 2.18:1 | Fails | Lc 12.3 | Not readable |
| #283A9E text on white | 9.59:1 | AAA | Lc 91.6 | Preferred for body text |
| #283A9E text on black | 2.18:1 | Fails | Lc -10.7 | 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 900.
-
Step 50
50
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E2EAFF
oklch(93.7% 0.03 269.1)
-
Step 200
200
#CAD8FF
oklch(88.4% 0.056 269.7)
-
Step 300
300
#A8BEFF
oklch(80.9% 0.096 269.8)
-
Step 400
400
#7B9AFF
oklch(70.8% 0.152 269.4)
-
Step 500
500
#5C7CFF
oklch(63.1% 0.197 269.6)
-
Step 600
600
#4059FF
oklch(55.5% 0.245 269.5)
-
Step 700
700
#323FEC
oklch(49.1% 0.252 269.6)
-
Step 800
800
#2836BE
oklch(42.6% 0.209 269.5)
-
Step 900
900 (this color)
#283A9E
oklch(40.2% 0.163 269.6)
-
Step 950
950
#141F58
oklch(27.1% 0.103 269.7)
#283A9E 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) | #004BA1 | 0.044 |
| Deuteranopia (no green cones) | #00409C | 0.028 |
| Tritanopia (no blue cones) | #005466 | 0.130 |
| Achromatopsia (no color) | #454545 | 0.163 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #283A9E
#283A9E
oklch(40.2% 0.163 269.6)
- #5A4500
#5A4500
oklch(40.2% 0.082 88.8)
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 #283A9E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.023
- Cobalt #1E488F ΔE 0.045
- Blueberry #464196 ΔE 0.050
- Dark Slate Blue #483D8B ΔE 0.057
- Indigo Blue #3A18B1 ΔE 0.063
- Blue Blue #2242C7 ΔE 0.069
- Twilight Blue #0A437A ΔE 0.070
- Dusk Blue #26538D ΔE 0.075
Use #283A9E 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.