#063F9A
Closest named color: Sapphire (#2138AB). oklch(39.7% 0.159 260.5), rgb(6, 63, 154).
Aa
White text reads best on this color (9.60:1).
About this color
#063F9A is a dark, vivid blue. In OKLCH its lightness is 40%, its chroma 0.159 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.035 away. White text reads best on it, at 9.60:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | vivid (0.159) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.18:1 |
| White text | 9.60:1 |
Values
| HEX | #063F9A |
| RGB | rgb(6, 63, 154) |
| HSL | hsl(217, 93%, 31%) |
| OKLCH | oklch(39.7% 0.159 260.5) |
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 #063F9A | 9.60:1 | AAA | Lc -95.8 | Preferred for body text |
| Black text on #063F9A | 2.18:1 | Fails | Lc 12.5 | Not readable |
| #063F9A text on white | 9.60:1 | AAA | Lc 91.5 | Preferred for body text |
| #063F9A text on black | 2.18:1 | Fails | Lc -10.9 | 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
#F0F6FF
oklch(97.1% 0.014 258.3)
-
Step 100
100
#DEEBFF
oklch(93.6% 0.031 258.9)
-
Step 200
200
#C4DAFF
oklch(88.4% 0.057 260.8)
-
Step 300
300
#9DC2FF
oklch(81% 0.096 260.2)
-
Step 400
400
#679FFF
oklch(70.7% 0.153 260.6)
-
Step 500
500
#3B83FF
oklch(63.1% 0.198 260.5)
-
Step 600
600
#0065F8
oklch(55.6% 0.233 260.5)
-
Step 700
700
#0055D2
oklch(49.1% 0.205 260.4)
-
Step 800
800
#0045AE
oklch(42.7% 0.178 260.4)
-
Step 900
900 (this color)
#063F9A
oklch(39.7% 0.159 260.5)
-
Step 950
950
#052256
oklch(26.9% 0.101 260.8)
#063F9A 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) | #004C9D | 0.034 |
| Deuteranopia (no green cones) | #003F98 | 0.004 |
| Tritanopia (no blue cones) | #005666 | 0.120 |
| Achromatopsia (no color) | #454545 | 0.159 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #063F9A
#063F9A
oklch(39.7% 0.159 260.5)
- #5E4100
#5E4100
oklch(39.8% 0.082 79.9)
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 #063F9A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.035
- Cobalt #1E488F ΔE 0.036
- Twilight Blue #0A437A ΔE 0.056
- Light Navy #155084 ΔE 0.064
- Blueberry #464196 ΔE 0.067
- Dusk Blue #26538D ΔE 0.068
- Dark Slate Blue #483D8B ΔE 0.073
- Deep Sea Blue #015482 ΔE 0.075
Use #063F9A 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.