#818599
Closest named color: Light Slate Gray (#778899). oklch(62% 0.03 276.5), rgb(129, 133, 153).
Aa
Black text reads best on this color (5.74:1).
About this color
#818599 is a medium-light, muted blue. In OKLCH its lightness is 62%, its chroma 0.030 and its hue 277°. Its hue sits on the cool side of the wheel. The nearest named color is Light Slate Gray (#778899), ΔE 0.015 away. Black text reads best on it, at 5.74:1.
| Hue family | Blues |
| Lightness | medium-light (62%) |
| Chroma | muted (0.030) |
| Temperature | cool |
| Nearest name | Light Slate Gray (#778899) |
| Black text | 5.74:1 |
| White text | 3.65:1 |
Values
| HEX | #818599 |
| RGB | rgb(129, 133, 153) |
| HSL | hsl(230, 11%, 55%) |
| OKLCH | oklch(62% 0.03 276.5) |
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 #818599 | 3.65:1 | AA large text | Lc -69.6 | Content text, not long reading |
| Black text on #818599 | 5.74:1 | AA | Lc 39.9 | Non-text elements, placeholder text |
| #818599 text on white | 3.65:1 | AA large text | Lc 64.1 | Content text, not long reading |
| #818599 text on black | 5.74:1 | AA | Lc -37.5 | 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
#F5F5F7
oklch(97.1% 0.003 286.4)
-
Step 100
100
#E9EAED
oklch(93.7% 0.004 271.4)
-
Step 200
200
#D7D9DF
oklch(88.6% 0.008 271.3)
-
Step 300
300
#BEC0CA
oklch(80.9% 0.014 277)
-
Step 400
400
#9CA0B0
oklch(70.8% 0.024 274.6)
-
Step 500
500 (this color)
#818599
oklch(62% 0.03 276.5)
-
Step 600
600
#6E7287
oklch(55.6% 0.033 276.8)
-
Step 700
700
#5C5F73
oklch(49% 0.032 278.4)
-
Step 800
800
#4B4E5D
oklch(42.7% 0.025 276.4)
-
Step 900
900
#3F414C
oklch(37.8% 0.019 277.3)
-
Step 950
950
#25262D
oklch(27.1% 0.013 279.1)
#818599 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) | #80879A | 0.005 |
| Deuteranopia (no green cones) | #7E8598 | 0.005 |
| Tritanopia (no blue cones) | #7C888B | 0.027 |
| Achromatopsia (no color) | #868686 | 0.030 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #818599
#818599
oklch(62% 0.03 276.5)
- #8B8772
#8B8772
oklch(62.1% 0.031 98.3)
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 #818599, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Light Slate Gray #778899 ΔE 0.015
- Lavender Gray #7E7F9A ΔE 0.019
- Steel #738595 ΔE 0.021
- Blue Grey #758DA3 ΔE 0.026
- Silver Lake Blue #778DA9 ΔE 0.029
- Slate Gray #708090 ΔE 0.031
- Purpley Grey #947E94 ΔE 0.032
- Steel Grey #6F828A ΔE 0.036
Use #818599 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.