#5599DB
Closest named color: Cornflower Blue (#6495ED). oklch(66.7% 0.121 249.4), rgb(85, 153, 219).
Aa
Black text reads best on this color (6.96:1).
About this color
#5599DB is a medium-light, moderately saturated blue. In OKLCH its lightness is 67%, its chroma 0.121 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.035 away. Black text reads best on it, at 6.96:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | moderately saturated (0.121) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 6.96:1 |
| White text | 3.01:1 |
Values
| HEX | #5599DB |
| RGB | rgb(85, 153, 219) |
| HSL | hsl(210, 65%, 60%) |
| OKLCH | oklch(66.7% 0.121 249.4) |
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 #5599DB | 3.01:1 | AA large text | Lc -62.0 | Content text, not long reading |
| Black text on #5599DB | 6.96:1 | AA | Lc 47.4 | Large or bold text, headings |
| #5599DB text on white | 3.01:1 | AA large text | Lc 56.7 | Large or bold text, headings |
| #5599DB text on black | 6.96:1 | AA | Lc -45.1 | 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 500.
-
Step 50
50
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E2EBF5
oklch(93.6% 0.017 250.8)
-
Step 200
200
#C9DBEE
oklch(88.4% 0.033 249.6)
-
Step 300
300
#A4C4E6
oklch(80.8% 0.059 250.1)
-
Step 400
400
#72A5D9
oklch(70.6% 0.094 249.7)
-
Step 500
500 (this color)
#5599DB
oklch(66.7% 0.121 249.4)
-
Step 600
600
#2977BC
oklch(55.6% 0.131 249.3)
-
Step 700
700
#1B64A2
oklch(49.2% 0.121 249.1)
-
Step 800
800
#195183
oklch(42.5% 0.101 249.5)
-
Step 900
900
#1C4469
oklch(37.7% 0.078 249.1)
-
Step 950
950
#11283E
oklch(27% 0.05 249.3)
#5599DB 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) | #7D9CDE | 0.045 |
| Deuteranopia (no green cones) | #6B8FDA | 0.032 |
| Tritanopia (no blue cones) | #00A8B0 | 0.097 |
| Achromatopsia (no color) | #949494 | 0.121 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5599DB
#5599DB
oklch(66.7% 0.121 249.4)
- #C38536
#C38536
oklch(66.5% 0.12 69.3)
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 #5599DB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.035
- Chefchaouen Blue #4895EF ΔE 0.036
- Dark Sky Blue #448EE4 ΔE 0.040
- Faded Blue #658CBB ΔE 0.053
- Soft Blue #6488EA ΔE 0.056
- Dodger Blue #1E90FF ΔE 0.072
- Water Blue #0E87CC ΔE 0.073
- Cool Blue #4984B8 ΔE 0.073
Use #5599DB 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.