#618599
Closest named color: Slate Gray (#708090). oklch(59.7% 0.051 233), rgb(97, 133, 153).
Aa
Black text reads best on this color (5.32:1).
About this color
#618599 is a medium-dark, muted blue. In OKLCH its lightness is 60%, its chroma 0.051 and its hue 233°. Its hue sits on the cool side of the wheel. The nearest named color is Slate Gray (#708090), ΔE 0.023 away. Black text reads best on it, at 5.32:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | muted (0.051) |
| Temperature | cool |
| Nearest name | Slate Gray (#708090) |
| Black text | 5.32:1 |
| White text | 3.94:1 |
Values
| HEX | #618599 |
| RGB | rgb(97, 133, 153) |
| HSL | hsl(201, 22%, 49%) |
| OKLCH | oklch(59.7% 0.051 233) |
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 #618599 | 3.94:1 | AA large text | Lc -72.3 | Content text, not long reading |
| Black text on #618599 | 5.32:1 | AA | Lc 37.3 | Non-text elements, placeholder text |
| #618599 text on white | 3.94:1 | AA large text | Lc 66.8 | Content text, not long reading |
| #618599 text on black | 5.32:1 | AA | Lc -34.9 | 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
#F3F6F7
oklch(97.1% 0.003 219.5)
-
Step 100
100
#E5EBEE
oklch(93.6% 0.008 228.9)
-
Step 200
200
#D1DBE1
oklch(88.6% 0.014 233.8)
-
Step 300
300
#B2C4CE
oklch(81% 0.024 231.9)
-
Step 400
400
#89A5B6
oklch(70.6% 0.04 234.8)
-
Step 500
500 (this color)
#618599
oklch(59.7% 0.051 233)
-
Step 600
600
#52798F
oklch(55.6% 0.056 233.8)
-
Step 700
700
#426679
oklch(49.1% 0.051 232.3)
-
Step 800
800
#375363
oklch(42.7% 0.043 234.2)
-
Step 900
900
#304550
oklch(37.7% 0.032 231.5)
-
Step 950
950
#1C282F
oklch(26.9% 0.021 234.2)
#618599 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) | #7C849A | 0.035 |
| Deuteranopia (no green cones) | #747D99 | 0.032 |
| Tritanopia (no blue cones) | #4D8A8B | 0.038 |
| Achromatopsia (no color) | #808080 | 0.051 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #618599
#618599
oklch(59.7% 0.051 233)
- #987763
#987763
oklch(59.6% 0.051 52.7)
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 #618599, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Slate Gray #708090 ΔE 0.023
- Steel #738595 ΔE 0.023
- Grey Blue #647D8E ΔE 0.024
- Steel Grey #6F828A ΔE 0.026
- Light Slate Gray #778899 ΔE 0.030
- Dusty Blue #5A86AD ΔE 0.031
- Battleship Grey #6B7C85 ΔE 0.034
- Off Blue #5684AE ΔE 0.035
Use #618599 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.