#63879E
Closest named color: Steel (#738595). oklch(60.5% 0.053 236.8), rgb(99, 135, 158).
Aa
Black text reads best on this color (5.48:1).
About this color
#63879E is a medium-dark, muted blue. In OKLCH its lightness is 61%, its chroma 0.053 and its hue 237°. Its hue sits on the cool side of the wheel. The nearest named color is Steel (#738595), ΔE 0.022 away. Black text reads best on it, at 5.48:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | muted (0.053) |
| Temperature | cool |
| Nearest name | Steel (#738595) |
| Black text | 5.48:1 |
| White text | 3.82:1 |
Values
| HEX | #63879E |
| RGB | rgb(99, 135, 158) |
| HSL | hsl(203, 23%, 50%) |
| OKLCH | oklch(60.5% 0.053 236.8) |
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 #63879E | 3.82:1 | AA large text | Lc -71.2 | Content text, not long reading |
| Black text on #63879E | 5.48:1 | AA | Lc 38.4 | Non-text elements, placeholder text |
| #63879E text on white | 3.82:1 | AA large text | Lc 65.7 | Content text, not long reading |
| #63879E text on black | 5.48:1 | AA | Lc -35.9 | Non-text elements, placeholder text |
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 500.
-
Step 50
50
#F3F6F7
oklch(97.1% 0.003 219.5)
-
Step 100
100
#E5EBEE
oklch(93.6% 0.008 228.9)
-
Step 200
200
#D1DBE2
oklch(88.6% 0.015 238)
-
Step 300
300
#B1C4D0
oklch(81% 0.027 235.4)
-
Step 400
400
#89A5B8
oklch(70.7% 0.042 237.9)
-
Step 500
500 (this color)
#63879E
oklch(60.5% 0.053 236.8)
-
Step 600
600
#527991
oklch(55.7% 0.058 236.2)
-
Step 700
700
#42667C
oklch(49.2% 0.054 236.2)
-
Step 800
800
#375365
oklch(42.8% 0.045 237.4)
-
Step 900
900
#304552
oklch(37.8% 0.034 236.1)
-
Step 950
950
#1C2830
oklch(26.9% 0.022 237.9)
#63879E 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) | #7D869F | 0.034 |
| Deuteranopia (no green cones) | #75809E | 0.029 |
| Tritanopia (no blue cones) | #4E8D8E | 0.042 |
| Achromatopsia (no color) | #828282 | 0.053 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63879E
#63879E
oklch(60.5% 0.053 236.8)
- #9B7A63
#9B7A63
oklch(60.5% 0.053 56.4)
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 #63879E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Steel #738595 ΔE 0.022
- Dusty Blue #5A86AD ΔE 0.026
- Light Slate Gray #778899 ΔE 0.027
- Slate Gray #708090 ΔE 0.027
- Blue Grey #758DA3 ΔE 0.030
- Steel Grey #6F828A ΔE 0.031
- Off Blue #5684AE ΔE 0.032
- Grey Blue #647D8E ΔE 0.032
Use #63879E 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.