#818BB1
Closest named color: Silver Lake Blue (#778DA9). oklch(64.3% 0.058 273.2), rgb(129, 139, 177).
Aa
Black text reads best on this color (6.26:1).
About this color
#818BB1 is a medium-light, muted blue. In OKLCH its lightness is 64%, its chroma 0.058 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Silver Lake Blue (#778DA9), ΔE 0.020 away. Black text reads best on it, at 6.26:1.
| Hue family | Blues |
| Lightness | medium-light (64%) |
| Chroma | muted (0.058) |
| Temperature | cool |
| Nearest name | Silver Lake Blue (#778DA9) |
| Black text | 6.26:1 |
| White text | 3.35:1 |
Values
| HEX | #818BB1 |
| RGB | rgb(129, 139, 177) |
| HSL | hsl(228, 24%, 60%) |
| OKLCH | oklch(64.3% 0.058 273.2) |
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 #818BB1 | 3.35:1 | AA large text | Lc -66.4 | Content text, not long reading |
| Black text on #818BB1 | 6.26:1 | AA | Lc 43.1 | Non-text elements, placeholder text |
| #818BB1 text on white | 3.35:1 | AA large text | Lc 61.0 | Content text, not long reading |
| #818BB1 text on black | 6.26:1 | AA | Lc -40.7 | 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
#F4F5F8
oklch(97% 0.004 271.4)
-
Step 100
100
#E8EAEF
oklch(93.7% 0.007 268.5)
-
Step 200
200
#D5D9E4
oklch(88.5% 0.016 270)
-
Step 300
300
#BAC0D4
oklch(80.9% 0.029 272.4)
-
Step 400
400
#979FBE
oklch(70.7% 0.046 273.8)
-
Step 500
500 (this color)
#818BB1
oklch(64.3% 0.058 273.2)
-
Step 600
600
#677199
oklch(55.6% 0.063 273.3)
-
Step 700
700
#565F83
oklch(49.3% 0.059 273.2)
-
Step 800
800
#464D6A
oklch(42.6% 0.049 273.7)
-
Step 900
900
#3B4056
oklch(37.6% 0.038 274.5)
-
Step 950
950
#222632
oklch(27% 0.023 270.4)
#818BB1 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) | #808EB3 | 0.008 |
| Deuteranopia (no green cones) | #7C8AB0 | 0.008 |
| Tritanopia (no blue cones) | #759298 | 0.052 |
| Achromatopsia (no color) | #8C8C8C | 0.058 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #818BB1
#818BB1
oklch(64.3% 0.058 273.2)
- #998D64
#998D64
oklch(64.4% 0.059 93.7)
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 #818BB1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Silver Lake Blue #778DA9 ΔE 0.020
- Blue Grey #758DA3 ΔE 0.030
- Faded Blue #658CBB ΔE 0.037
- Light Slate Gray #778899 ΔE 0.040
- Lavender Gray #7E7F9A ΔE 0.042
- Cool Gray #8D99AE ΔE 0.046
- Steel #738595 ΔE 0.048
- Purpley Grey #947E94 ΔE 0.052
Use #818BB1 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.