#818BB9
Closest named color: Silver Lake Blue (#778DA9). oklch(64.6% 0.07 274.8), rgb(129, 139, 185).
Aa
Black text reads best on this color (6.32:1).
About this color
#818BB9 is a medium-light, muted blue. In OKLCH its lightness is 65%, its chroma 0.070 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Silver Lake Blue (#778DA9), ΔE 0.031 away. Black text reads best on it, at 6.32:1.
| Hue family | Blues |
| Lightness | medium-light (65%) |
| Chroma | muted (0.070) |
| Temperature | cool |
| Nearest name | Silver Lake Blue (#778DA9) |
| Black text | 6.32:1 |
| White text | 3.31:1 |
Values
| HEX | #818BB9 |
| RGB | rgb(129, 139, 185) |
| HSL | hsl(229, 29%, 62%) |
| OKLCH | oklch(64.6% 0.07 274.8) |
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 #818BB9 | 3.31:1 | AA large text | Lc -66.0 | Content text, not long reading |
| Black text on #818BB9 | 6.32:1 | AA | Lc 43.5 | Non-text elements, placeholder text |
| #818BB9 text on white | 3.31:1 | AA large text | Lc 60.6 | Content text, not long reading |
| #818BB9 text on black | 6.32:1 | AA | Lc -41.1 | 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
#F4F5F9
oklch(97.1% 0.005 275)
-
Step 100
100
#E8E9F1
oklch(93.6% 0.011 280.5)
-
Step 200
200
#D5D8E6
oklch(88.4% 0.019 276.3)
-
Step 300
300
#BABFD7
oklch(80.8% 0.034 276.3)
-
Step 400
400
#969FC3
oklch(70.8% 0.054 274)
-
Step 500
500 (this color)
#818BB9
oklch(64.6% 0.07 274.8)
-
Step 600
600
#6670A0
oklch(55.6% 0.076 274.6)
-
Step 700
700
#555D89
oklch(49% 0.071 275.6)
-
Step 800
800
#454C6F
oklch(42.6% 0.059 274.9)
-
Step 900
900
#3A405A
oklch(37.7% 0.045 274)
-
Step 950
950
#222535
oklch(26.9% 0.03 276)
#818BB9 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) | #7D8FBB | 0.011 |
| Deuteranopia (no green cones) | #798BB8 | 0.011 |
| Tritanopia (no blue cones) | #72949B | 0.063 |
| Achromatopsia (no color) | #8D8D8D | 0.070 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #818BB9
#818BB9
oklch(64.6% 0.07 274.8)
- #9B8E5C
#9B8E5C
oklch(64.6% 0.07 95.3)
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 #818BB9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Silver Lake Blue #778DA9 ΔE 0.031
- Faded Blue #658CBB ΔE 0.035
- Blue Grey #758DA3 ΔE 0.040
- Lavender Gray #7E7F9A ΔE 0.051
- Light Slate Gray #778899 ΔE 0.051
- Cool Gray #8D99AE ΔE 0.051
- Heather #A484AC ΔE 0.054
- Dusty Blue #5A86AD ΔE 0.056
Use #818BB9 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.