#303999
Closest named color: Sapphire (#2138AB). oklch(40% 0.155 273), rgb(48, 57, 153).
Aa
White text reads best on this color (9.67:1).
About this color
#303999 is a dark, vivid blue. In OKLCH its lightness is 40%, its chroma 0.155 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.034 away. White text reads best on it, at 9.67:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | vivid (0.155) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.17:1 |
| White text | 9.67:1 |
Values
| HEX | #303999 |
| RGB | rgb(48, 57, 153) |
| HSL | hsl(235, 52%, 39%) |
| OKLCH | oklch(40% 0.155 273) |
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 #303999 | 9.67:1 | AAA | Lc -96.2 | Preferred for body text |
| Black text on #303999 | 2.17:1 | Fails | Lc 12.0 | Not readable |
| #303999 text on white | 9.67:1 | AAA | Lc 91.9 | Preferred for body text |
| #303999 text on black | 2.17:1 | Fails | Lc -10.5 | 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
#E3E9FF
oklch(93.6% 0.03 273.6)
-
Step 200
200
#CDD7FF
oklch(88.4% 0.056 274.2)
-
Step 300
300
#ACBDFF
oklch(80.9% 0.095 273)
-
Step 400
400
#8298FF
oklch(70.8% 0.152 272.8)
-
Step 500
500
#6579FF
oklch(63.1% 0.198 273)
-
Step 600
600
#4D55FF
oklch(55.5% 0.246 273)
-
Step 700
700
#3F3FE5
oklch(49.1% 0.241 273.1)
-
Step 800
800
#3336B9
oklch(42.7% 0.2 273.1)
-
Step 900
900 (this color)
#303999
oklch(40% 0.155 273)
-
Step 950
950
#191F55
oklch(27.1% 0.097 273.2)
#303999 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) | #00499C | 0.047 |
| Deuteranopia (no green cones) | #004097 | 0.038 |
| Tritanopia (no blue cones) | #005163 | 0.126 |
| Achromatopsia (no color) | #444444 | 0.156 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #303999
#303999
oklch(40% 0.155 273)
- #574600
#574600
oklch(40% 0.082 93)
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 #303999, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.034
- Blueberry #464196 ΔE 0.041
- Cobalt #1E488F ΔE 0.044
- Dark Slate Blue #483D8B ΔE 0.046
- Indigo Blue #3A18B1 ΔE 0.064
- Twilight Blue #0A437A ΔE 0.068
- Dusk Blue #26538D ΔE 0.074
- Imperial Purple #480CA8 ΔE 0.075
Use #303999 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.