#818F91
Closest named color: Light Slate Gray (#778899). oklch(63.9% 0.016 207.1), rgb(129, 143, 145).
Aa
Black text reads best on this color (6.27:1).
About this color
#818F91 is a medium-light close to neutral grey. In OKLCH its lightness is 64%, its chroma 0.016. It has too little chroma to lean warm or cool. The nearest named color is Light Slate Gray (#778899), ΔE 0.031 away. Black text reads best on it, at 6.27:1.
| Hue family | Neutrals |
| Lightness | medium-light (64%) |
| Chroma | close to neutral grey (0.016) |
| Temperature | neutral |
| Nearest name | Light Slate Gray (#778899) |
| Black text | 6.27:1 |
| White text | 3.34:1 |
Values
| HEX | #818F91 |
| RGB | rgb(129, 143, 145) |
| HSL | hsl(187, 7%, 54%) |
| OKLCH | oklch(63.9% 0.016 207.1) |
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 #818F91 | 3.34:1 | AA large text | Lc -66.4 | Content text, not long reading |
| Black text on #818F91 | 6.27:1 | AA | Lc 43.1 | Non-text elements, placeholder text |
| #818F91 text on white | 3.34:1 | AA large text | Lc 60.9 | Content text, not long reading |
| #818F91 text on black | 6.27:1 | AA | Lc -40.8 | 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
#F5F6F6
oklch(97.2% 0.001 197.1)
-
Step 100
100
#E8EAEA
oklch(93.6% 0.002 197.1)
-
Step 200
200
#D6DADA
oklch(88.5% 0.004 197.1)
-
Step 300
300
#BBC2C3
oklch(80.9% 0.008 207.1)
-
Step 400
400
#98A3A5
oklch(70.7% 0.013 209.8)
-
Step 500
500 (this color)
#818F91
oklch(63.9% 0.016 207.1)
-
Step 600
600
#687679
oklch(55.5% 0.017 212)
-
Step 700
700
#566465
oklch(49.2% 0.017 201.9)
-
Step 800
800
#475153
oklch(42.7% 0.013 211.1)
-
Step 900
900
#3B4344
oklch(37.6% 0.011 205.8)
-
Step 950
950
#232728
oklch(26.9% 0.006 214.4)
#818F91 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) | #8D8E91 | 0.017 |
| Deuteranopia (no green cones) | #8A8B91 | 0.016 |
| Tritanopia (no blue cones) | #7D9090 | 0.006 |
| Achromatopsia (no color) | #8C8C8C | 0.017 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #818F91
#818F91
oklch(63.9% 0.016 207.1)
- #968887
#968887
oklch(63.9% 0.017 22.5)
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 #818F91, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Light Slate Gray #778899 ΔE 0.031
- Blue Grey #758DA3 ΔE 0.033
- Warm Grey #978A84 ΔE 0.034
- Steel #738595 ΔE 0.038
- Silver Lake Blue #778DA9 ΔE 0.040
- Gray #808080 ΔE 0.043
- Steel Grey #6F828A ΔE 0.047
- Medium Grey #7D7F7C ΔE 0.048
Use #818F91 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.