#618399
Closest named color: Grey Blue (#647D8E). oklch(59.3% 0.051 237.1), rgb(97, 131, 153).
Aa
Black text reads best on this color (5.21:1).
About this color
#618399 is a medium-dark, muted blue. In OKLCH its lightness is 59%, its chroma 0.051 and its hue 237°. Its hue sits on the cool side of the wheel. The nearest named color is Grey Blue (#647D8E), ΔE 0.020 away. Black text reads best on it, at 5.21:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | muted (0.051) |
| Temperature | cool |
| Nearest name | Grey Blue (#647D8E) |
| Black text | 5.21:1 |
| White text | 4.02:1 |
Values
| HEX | #618399 |
| RGB | rgb(97, 131, 153) |
| HSL | hsl(204, 22%, 49%) |
| OKLCH | oklch(59.3% 0.051 237.1) |
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 #618399 | 4.02:1 | AA large text | Lc -73.0 | Content text, not long reading |
| Black text on #618399 | 5.21:1 | AA | Lc 36.6 | Non-text elements, placeholder text |
| #618399 text on white | 4.02:1 | AA large text | Lc 67.5 | Content text, not long reading |
| #618399 text on black | 5.21:1 | AA | Lc -34.2 | 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 600.
-
Step 50
50
#F4F6F7
oklch(97.2% 0.003 228.8)
-
Step 100
100
#E6EBEE
oklch(93.7% 0.007 233.6)
-
Step 200
200
#D2DBE1
oklch(88.6% 0.013 236.6)
-
Step 300
300
#B3C3CE
oklch(80.8% 0.023 237.7)
-
Step 400
400
#8CA5B5
oklch(70.8% 0.036 236.1)
-
Step 500
500
#6F8EA3
oklch(63.1% 0.047 238.1)
-
Step 600
600 (this color)
#618399
oklch(59.3% 0.051 237.1)
-
Step 700
700
#476579
oklch(49.1% 0.048 238.2)
-
Step 800
800
#3A5262
oklch(42.6% 0.04 238.1)
-
Step 900
900
#324450
oklch(37.6% 0.031 237.8)
-
Step 950
950
#1E282F
oklch(27% 0.019 238.9)
#618399 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) | #79829A | 0.031 |
| Deuteranopia (no green cones) | #717C99 | 0.027 |
| Tritanopia (no blue cones) | #4E898A | 0.040 |
| Achromatopsia (no color) | #7F7F7F | 0.051 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #618399
#618399
oklch(59.3% 0.051 237.1)
- #967760
#967760
oklch(59.3% 0.051 58.1)
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 #618399, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Grey Blue #647D8E ΔE 0.020
- Slate Gray #708090 ΔE 0.022
- Steel #738595 ΔE 0.025
- Steel Grey #6F828A ΔE 0.027
- Dusty Blue #5A86AD ΔE 0.030
- Battleship Grey #6B7C85 ΔE 0.032
- Off Blue #5684AE ΔE 0.033
- Light Slate Gray #778899 ΔE 0.033
Use #618399 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.