#818D99
Closest named color: Blue Grey (#758DA3). oklch(63.8% 0.023 248.2), rgb(129, 141, 153).
Aa
Black text reads best on this color (6.20:1).
About this color
#818D99 is a medium-light close to neutral grey. In OKLCH its lightness is 64%, its chroma 0.023. It has too little chroma to lean warm or cool. The nearest named color is Blue Grey (#758DA3), ΔE 0.021 away. Black text reads best on it, at 6.20:1.
| Hue family | Neutrals |
| Lightness | medium-light (64%) |
| Chroma | close to neutral grey (0.023) |
| Temperature | neutral |
| Nearest name | Blue Grey (#758DA3) |
| Black text | 6.20:1 |
| White text | 3.38:1 |
Values
| HEX | #818D99 |
| RGB | rgb(129, 141, 153) |
| HSL | hsl(210, 11%, 55%) |
| OKLCH | oklch(63.8% 0.023 248.2) |
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 #818D99 | 3.38:1 | AA large text | Lc -66.8 | Content text, not long reading |
| Black text on #818D99 | 6.20:1 | AA | Lc 42.7 | Non-text elements, placeholder text |
| #818D99 text on white | 3.38:1 | AA large text | Lc 61.3 | Content text, not long reading |
| #818D99 text on black | 6.20:1 | AA | Lc -40.3 | 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
#E8EAEC
oklch(93.6% 0.003 247.9)
-
Step 200
200
#D6D9DD
oklch(88.4% 0.006 255.5)
-
Step 300
300
#BBC1C8
oklch(80.8% 0.012 252.1)
-
Step 400
400
#98A2AB
oklch(70.7% 0.017 245.2)
-
Step 500
500 (this color)
#818D99
oklch(63.8% 0.023 248.2)
-
Step 600
600
#687582
oklch(55.6% 0.026 248.3)
-
Step 700
700
#57626D
oklch(49.1% 0.022 248.3)
-
Step 800
800
#475059
oklch(42.7% 0.019 248.3)
-
Step 900
900
#3C4249
oklch(37.6% 0.014 252.3)
-
Step 950
950
#23272B
oklch(27% 0.009 248.2)
#818D99 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) | #898D9A | 0.011 |
| Deuteranopia (no green cones) | #868A99 | 0.010 |
| Tritanopia (no blue cones) | #7B9091 | 0.019 |
| Achromatopsia (no color) | #8B8B8B | 0.023 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #818D99
#818D99
oklch(63.8% 0.023 248.2)
- #95897D
#95897D
oklch(63.7% 0.023 67.4)
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 #818D99, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue Grey #758DA3 ΔE 0.021
- Light Slate Gray #778899 ΔE 0.021
- Silver Lake Blue #778DA9 ΔE 0.027
- Steel #738595 ΔE 0.031
- Warm Grey #978A84 ΔE 0.041
- Lavender Gray #7E7F9A ΔE 0.041
- Gray #808080 ΔE 0.044
- Steel Grey #6F828A ΔE 0.045
Use #818D99 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.