#599CCF
Closest named color: Faded Blue (#658CBB). oklch(66.9% 0.102 243.1), rgb(89, 156, 207).
Aa
Black text reads best on this color (7.08:1).
About this color
#599CCF is a medium-light, moderately saturated blue. In OKLCH its lightness is 67%, its chroma 0.102 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Faded Blue (#658CBB), ΔE 0.047 away. Black text reads best on it, at 7.08:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | moderately saturated (0.102) |
| Temperature | cool |
| Nearest name | Faded Blue (#658CBB) |
| Black text | 7.08:1 |
| White text | 2.96:1 |
Values
| HEX | #599CCF |
| RGB | rgb(89, 156, 207) |
| HSL | hsl(206, 55%, 58%) |
| OKLCH | oklch(66.9% 0.102 243.1) |
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 #599CCF | 2.96:1 | Fails | Lc -61.4 | Content text, not long reading |
| Black text on #599CCF | 7.08:1 | AAA | Lc 48.0 | Large or bold text, headings |
| #599CCF text on white | 2.96:1 | Fails | Lc 56.0 | Large or bold text, headings |
| #599CCF text on black | 7.08:1 | AAA | Lc -45.7 | 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
#E0ECF6
oklch(93.7% 0.019 243)
-
Step 200
200
#C6DCEF
oklch(88.4% 0.035 244.2)
-
Step 300
300
#9DC6E7
oklch(80.8% 0.064 242.9)
-
Step 400
400 (this color)
#599CCF
oklch(66.9% 0.102 243.1)
-
Step 500
500
#3291D2
oklch(63.2% 0.131 243.1)
-
Step 600
600
#007ABB
oklch(55.7% 0.134 242.9)
-
Step 700
700
#00669E
oklch(49% 0.119 243.2)
-
Step 800
800
#005483
oklch(42.8% 0.104 243)
-
Step 900
900
#0A456B
oklch(37.6% 0.086 243.7)
-
Step 950
950
#0A293F
oklch(27.1% 0.054 243.5)
#599CCF 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) | #869CD1 | 0.050 |
| Deuteranopia (no green cones) | #7691CE | 0.040 |
| Tritanopia (no blue cones) | #00A8AD | 0.082 |
| Achromatopsia (no color) | #969696 | 0.102 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #599CCF
#599CCF
oklch(66.9% 0.102 243.1)
- #C1874F
#C1874F
oklch(67% 0.102 63.6)
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 #599CCF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Faded Blue #658CBB ΔE 0.047
- Greyblue #77A1B5 ΔE 0.054
- Cornflower Blue #6495ED ΔE 0.055
- Chefchaouen Blue #4895EF ΔE 0.058
- Dark Sky Blue #448EE4 ΔE 0.060
- Silver Lake Blue #778DA9 ΔE 0.064
- Blue Grey #758DA3 ΔE 0.070
- Bluegrey #85A3B2 ΔE 0.070
Use #599CCF 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.