#283997
Closest named color: Sapphire (#2138AB). oklch(39.3% 0.154 269.9), rgb(40, 57, 151).
Aa
White text reads best on this color (9.89:1).
About this color
#283997 is a dark, vivid blue. In OKLCH its lightness is 39%, its chroma 0.154 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.033 away. White text reads best on it, at 9.89:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | vivid (0.154) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.12:1 |
| White text | 9.89:1 |
Values
| HEX | #283997 |
| RGB | rgb(40, 57, 151) |
| HSL | hsl(231, 58%, 37%) |
| OKLCH | oklch(39.3% 0.154 269.9) |
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 #283997 | 9.89:1 | AAA | Lc -96.6 | Preferred for body text |
| Black text on #283997 | 2.12:1 | Fails | Lc 11.5 | Not readable |
| #283997 text on white | 9.89:1 | AAA | Lc 92.4 | Preferred for body text |
| #283997 text on black | 2.12:1 | Fails | Lc -10.0 | 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
#E2E9FF
oklch(93.5% 0.031 271.7)
-
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
#7C99FF
oklch(70.6% 0.153 270.2)
-
Step 500
500
#5C7CFF
oklch(63.1% 0.197 269.6)
-
Step 600
600
#4259FF
oklch(55.6% 0.245 269.9)
-
Step 700
700
#3443E5
oklch(49.1% 0.24 269.9)
-
Step 800
800
#2A39B9
oklch(42.7% 0.199 269.9)
-
Step 900
900 (this color)
#283997
oklch(39.3% 0.154 269.9)
-
Step 950
950
#152055
oklch(27% 0.097 269.8)
#283997 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) | #00489A | 0.041 |
| Deuteranopia (no green cones) | #003E95 | 0.028 |
| Tritanopia (no blue cones) | #005162 | 0.124 |
| Achromatopsia (no color) | #434343 | 0.155 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #283997
#283997
oklch(39.3% 0.154 269.9)
- #574300
#574300
oklch(39.3% 0.08 89.3)
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 #283997, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.033
- Cobalt #1E488F ΔE 0.042
- Blueberry #464196 ΔE 0.050
- Dark Slate Blue #483D8B ΔE 0.053
- Twilight Blue #0A437A ΔE 0.061
- Indigo Blue #3A18B1 ΔE 0.068
- Light Navy #155084 ΔE 0.073
- Dusk Blue #26538D ΔE 0.074
Use #283997 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.