#5599FF
Closest named color: Chefchaouen Blue (#4895EF). oklch(68.6% 0.166 258.4), rgb(85, 153, 255).
Aa
Black text reads best on this color (7.38:1).
About this color
#5599FF is a medium-light, vivid blue. In OKLCH its lightness is 69%, its chroma 0.166 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.028 away. Black text reads best on it, at 7.38:1.
| Hue family | Blues |
| Lightness | medium-light (69%) |
| Chroma | vivid (0.166) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 7.38:1 |
| White text | 2.84:1 |
Values
| HEX | #5599FF |
| RGB | rgb(85, 153, 255) |
| HSL | hsl(216, 100%, 67%) |
| OKLCH | oklch(68.6% 0.166 258.4) |
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 #5599FF | 2.84:1 | Fails | Lc -59.5 | Large or bold text, headings |
| Black text on #5599FF | 7.38:1 | AAA | Lc 49.8 | Large or bold text, headings |
| #5599FF text on white | 2.84:1 | Fails | Lc 54.2 | Large or bold text, headings |
| #5599FF text on black | 7.38:1 | AAA | Lc -47.6 | 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
#F0F6FF
oklch(97.1% 0.014 258.3)
-
Step 100
100
#DEEBFE
oklch(93.6% 0.029 257.8)
-
Step 200
200
#C3DBFF
oklch(88.5% 0.056 258.4)
-
Step 300
300
#9AC3FF
oklch(81% 0.096 257.8)
-
Step 400
400 (this color)
#5599FF
oklch(68.6% 0.166 258.4)
-
Step 500
500
#2F84FF
oklch(63% 0.2 258.5)
-
Step 600
600
#006BEA
oklch(55.6% 0.209 258.4)
-
Step 700
700
#005AC6
oklch(49.1% 0.184 258.2)
-
Step 800
800
#0049A4
oklch(42.7% 0.16 258.3)
-
Step 900
900
#033D89
oklch(37.7% 0.138 258.4)
-
Step 950
950
#062450
oklch(26.9% 0.088 258.5)
#5599FF 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) | #6AA2FF | 0.033 |
| Deuteranopia (no green cones) | #5092FD | 0.019 |
| Tritanopia (no blue cones) | #00B1C0 | 0.134 |
| Achromatopsia (no color) | #999999 | 0.166 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5599FF
#5599FF
oklch(68.6% 0.166 258.4)
- #CA8D00
#CA8D00
oklch(68.6% 0.143 78)
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 #5599FF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.028
- Cornflower Blue #6495ED ΔE 0.029
- Dodger Blue #1E90FF ΔE 0.045
- Soft Blue #6488EA ΔE 0.049
- Dark Sky Blue #448EE4 ΔE 0.050
- Periwinkle Blue #8F99FB ΔE 0.064
- Lavender Blue #8B88F8 ΔE 0.069
- Perrywinkle #8F8CE7 ΔE 0.074
Use #5599FF 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.