#283F9F
Closest named color: Sapphire (#2138AB). oklch(41.2% 0.158 268.2), rgb(40, 63, 159).
Aa
White text reads best on this color (9.12:1).
About this color
#283F9F is a dark, vivid blue. In OKLCH its lightness is 41%, its chroma 0.158 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.027 away. White text reads best on it, at 9.12:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | vivid (0.158) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.30:1 |
| White text | 9.12:1 |
Values
| HEX | #283F9F |
| RGB | rgb(40, 63, 159) |
| HSL | hsl(228, 60%, 39%) |
| OKLCH | oklch(41.2% 0.158 268.2) |
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 #283F9F | 9.12:1 | AAA | Lc -94.9 | Preferred for body text |
| Black text on #283F9F | 2.30:1 | Fails | Lc 13.5 | Not readable |
| #283F9F text on white | 9.12:1 | AAA | Lc 90.5 | Preferred for body text |
| #283F9F text on black | 2.30:1 | Fails | Lc -11.8 | 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
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E2EAFC
oklch(93.6% 0.026 266.6)
-
Step 200
200
#CBD9FC
oklch(88.6% 0.051 268.1)
-
Step 300
300
#A7BFFD
oklch(80.9% 0.092 268)
-
Step 400
400
#7A9BFC
oklch(70.7% 0.147 268.3)
-
Step 500
500
#5A7EFA
oklch(63.1% 0.189 268.4)
-
Step 600
600
#4263E9
oklch(55.5% 0.206 268.3)
-
Step 700
700
#3551CB
oklch(49.1% 0.191 268.4)
-
Step 800
800 (this color)
#283F9F
oklch(41.2% 0.158 268.2)
-
Step 900
900
#263A82
oklch(37.6% 0.124 268.2)
-
Step 950
950
#16234C
oklch(27% 0.078 267.7)
#283F9F 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) | #004EA2 | 0.040 |
| Deuteranopia (no green cones) | #00439D | 0.026 |
| Tritanopia (no blue cones) | #005768 | 0.126 |
| Achromatopsia (no color) | #484848 | 0.158 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #283F9F
#283F9F
oklch(41.2% 0.158 268.2)
- #5E4800
#5E4800
oklch(41.3% 0.084 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 #283F9F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.027
- Cobalt #1E488F ΔE 0.037
- Blueberry #464196 ΔE 0.044
- Dark Slate Blue #483D8B ΔE 0.055
- Dusk Blue #26538D ΔE 0.064
- Blue Blue #2242C7 ΔE 0.065
- Light Navy #155084 ΔE 0.068
- Twilight Blue #0A437A ΔE 0.068
Use #283F9F 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.