#878B99
Closest named color: Light Slate Gray (#778899). oklch(63.8% 0.021 273.1), rgb(135, 139, 153).
Aa
Black text reads best on this color (6.18:1).
About this color
#878B99 is a medium-light close to neutral grey. In OKLCH its lightness is 64%, its chroma 0.021. It has too little chroma to lean warm or cool. The nearest named color is Light Slate Gray (#778899), ΔE 0.025 away. Black text reads best on it, at 6.18:1.
| Hue family | Neutrals |
| Lightness | medium-light (64%) |
| Chroma | close to neutral grey (0.021) |
| Temperature | neutral |
| Nearest name | Light Slate Gray (#778899) |
| Black text | 6.18:1 |
| White text | 3.39:1 |
Values
| HEX | #878B99 |
| RGB | rgb(135, 139, 153) |
| HSL | hsl(227, 8%, 56%) |
| OKLCH | oklch(63.8% 0.021 273.1) |
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 #878B99 | 3.39:1 | AA large text | Lc -66.9 | Content text, not long reading |
| Black text on #878B99 | 6.18:1 | AA | Lc 42.6 | Non-text elements, placeholder text |
| #878B99 text on white | 3.39:1 | AA large text | Lc 61.5 | Content text, not long reading |
| #878B99 text on black | 6.18:1 | AA | Lc -40.2 | 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
#F5F5F6
oklch(97% 0.001 286.4)
-
Step 100
100
#E9EAEC
oklch(93.7% 0.003 264.5)
-
Step 200
200
#D8D9DD
oklch(88.6% 0.006 275)
-
Step 300
300
#BEC0C8
oklch(80.9% 0.011 274.9)
-
Step 400
400
#9DA0AB
oklch(70.7% 0.016 273.8)
-
Step 500
500 (this color)
#878B99
oklch(63.8% 0.021 273.1)
-
Step 600
600
#6F7381
oklch(55.7% 0.022 273)
-
Step 700
700
#5C606D
oklch(49% 0.021 272)
-
Step 800
800
#4C4F59
oklch(42.9% 0.017 272.4)
-
Step 900
900
#3F4149
oklch(37.6% 0.014 274.6)
-
Step 950
950
#25262B
oklch(27% 0.009 276.8)
#878B99 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) | #878C9A | 0.003 |
| Deuteranopia (no green cones) | #868B99 | 0.001 |
| Tritanopia (no blue cones) | #838D8F | 0.019 |
| Achromatopsia (no color) | #8B8B8B | 0.021 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #878B99
#878B99
oklch(63.8% 0.021 273.1)
- #908C7D
#908C7D
oklch(63.9% 0.022 94.7)
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 #878B99, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Light Slate Gray #778899 ΔE 0.025
- Blue Grey #758DA3 ΔE 0.026
- Silver Lake Blue #778DA9 ΔE 0.030
- Steel #738595 ΔE 0.034
- Warm Grey #978A84 ΔE 0.037
- Purpley Grey #947E94 ΔE 0.038
- Lavender Gray #7E7F9A ΔE 0.039
- English Lavender #9D8189 ΔE 0.041
Use #878B99 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.