#5599EC
Closest named color: Cornflower Blue (#6495ED). oklch(67.6% 0.142 254.5), rgb(85, 153, 236).
Aa
Black text reads best on this color (7.15:1).
About this color
#5599EC is a medium-light, vivid blue. In OKLCH its lightness is 68%, its chroma 0.142 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.017 away. Black text reads best on it, at 7.15:1.
| Hue family | Blues |
| Lightness | medium-light (68%) |
| Chroma | vivid (0.142) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 7.15:1 |
| White text | 2.93:1 |
Values
| HEX | #5599EC |
| RGB | rgb(85, 153, 236) |
| HSL | hsl(213, 80%, 63%) |
| OKLCH | oklch(67.6% 0.142 254.5) |
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 #5599EC | 2.93:1 | Fails | Lc -60.9 | Content text, not long reading |
| Black text on #5599EC | 7.15:1 | AAA | Lc 48.5 | Large or bold text, headings |
| #5599EC text on white | 2.93:1 | Fails | Lc 55.6 | Large or bold text, headings |
| #5599EC text on black | 7.15:1 | AAA | Lc -46.2 | 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
#F0F6FE
oklch(97.1% 0.012 255.5)
-
Step 100
100
#DFEBFB
oklch(93.6% 0.025 255.6)
-
Step 200
200
#C4DBFA
oklch(88.4% 0.05 255.9)
-
Step 300
300
#9AC4F9
oklch(80.9% 0.088 254.5)
-
Step 400
400 (this color)
#5599EC
oklch(67.6% 0.142 254.5)
-
Step 500
500
#2989F3
oklch(63.1% 0.181 254.5)
-
Step 600
600
#0071D9
oklch(55.6% 0.181 254.6)
-
Step 700
700
#005FB8
oklch(49.1% 0.16 254.6)
-
Step 800
800
#004D98
oklch(42.6% 0.139 254.8)
-
Step 900
900
#04417E
oklch(37.8% 0.118 254.3)
-
Step 950
950
#07264A
oklch(26.9% 0.076 254.9)
#5599EC 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) | #759EEF | 0.037 |
| Deuteranopia (no green cones) | #6090EA | 0.024 |
| Tritanopia (no blue cones) | #00ACB7 | 0.115 |
| Achromatopsia (no color) | #979797 | 0.142 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5599EC
#5599EC
oklch(67.6% 0.142 254.5)
- #C98805
#C98805
oklch(67.6% 0.142 74.9)
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 #5599EC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.017
- Chefchaouen Blue #4895EF ΔE 0.018
- Dark Sky Blue #448EE4 ΔE 0.036
- Soft Blue #6488EA ΔE 0.045
- Dodger Blue #1E90FF ΔE 0.054
- Perrywinkle #8F8CE7 ΔE 0.070
- Periwinkle Blue #8F99FB ΔE 0.070
- Faded Blue #658CBB ΔE 0.074
Use #5599EC 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.