#599ECF
Closest named color: Greyblue (#77A1B5). oklch(67.4% 0.101 241.3), rgb(89, 158, 207).
Aa
Black text reads best on this color (7.21:1).
About this color
#599ECF is a medium-light, moderately saturated blue. In OKLCH its lightness is 67%, its chroma 0.101 and its hue 241°. Its hue sits on the cool side of the wheel. The nearest named color is Greyblue (#77A1B5), ΔE 0.051 away. Black text reads best on it, at 7.21:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | moderately saturated (0.101) |
| Temperature | cool |
| Nearest name | Greyblue (#77A1B5) |
| Black text | 7.21:1 |
| White text | 2.90:1 |
Values
| HEX | #599ECF |
| RGB | rgb(89, 158, 207) |
| HSL | hsl(205, 55%, 58%) |
| OKLCH | oklch(67.4% 0.101 241.3) |
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 #599ECF | 2.90:1 | Fails | Lc -60.6 | Content text, not long reading |
| Black text on #599ECF | 7.21:1 | AAA | Lc 48.8 | Large or bold text, headings |
| #599ECF text on white | 2.90:1 | Fails | Lc 55.3 | Large or bold text, headings |
| #599ECF text on black | 7.21:1 | AAA | Lc -46.5 | Large or bold text, headings |
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 400.
-
Step 50
50
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E0ECF5
oklch(93.7% 0.018 240)
-
Step 200
200
#C6DDEF
oklch(88.6% 0.035 241.5)
-
Step 300
300
#9DC6E6
oklch(80.8% 0.063 242)
-
Step 400
400 (this color)
#599ECF
oklch(67.4% 0.101 241.3)
-
Step 500
500
#2E92D0
oklch(63.2% 0.129 241.1)
-
Step 600
600
#007BB8
oklch(55.7% 0.13 241.1)
-
Step 700
700
#00679B
oklch(49.1% 0.115 241)
-
Step 800
800
#005480
oklch(42.6% 0.1 241.3)
-
Step 900
900
#07466A
oklch(37.7% 0.084 241.4)
-
Step 950
950
#09293E
oklch(27% 0.054 241.8)
#599ECF 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) | #889ED1 | 0.052 |
| Deuteranopia (no green cones) | #7892CE | 0.043 |
| Tritanopia (no blue cones) | #00AAAF | 0.080 |
| Achromatopsia (no color) | #979797 | 0.101 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #599ECF
#599ECF
oklch(67.4% 0.101 241.3)
- #C38852
#C38852
oklch(67.4% 0.101 62.2)
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 #599ECF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greyblue #77A1B5 ΔE 0.051
- Faded Blue #658CBB ΔE 0.051
- Cornflower Blue #6495ED ΔE 0.058
- Chefchaouen Blue #4895EF ΔE 0.061
- Dark Sky Blue #448EE4 ΔE 0.064
- Silver Lake Blue #778DA9 ΔE 0.066
- Bluegrey #85A3B2 ΔE 0.067
- Turquoise Blue #06B1C4 ΔE 0.068
Use #599ECF 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.