#5591EE
Closest named color: Chefchaouen Blue (#4895EF). oklch(66% 0.153 258.9), rgb(85, 145, 238).
Aa
Black text reads best on this color (6.67:1).
About this color
#5591EE is a medium-light, vivid blue. In OKLCH its lightness is 66%, its chroma 0.153 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.014 away. Black text reads best on it, at 6.67:1.
| Hue family | Blues |
| Lightness | medium-light (66%) |
| Chroma | vivid (0.153) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 6.67:1 |
| White text | 3.14:1 |
Values
| HEX | #5591EE |
| RGB | rgb(85, 145, 238) |
| HSL | hsl(216, 82%, 63%) |
| OKLCH | oklch(66% 0.153 258.9) |
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 #5591EE | 3.14:1 | AA large text | Lc -63.7 | Content text, not long reading |
| Black text on #5591EE | 6.67:1 | AA | Lc 45.8 | Large or bold text, headings |
| #5591EE text on white | 3.14:1 | AA large text | Lc 58.3 | Large or bold text, headings |
| #5591EE text on black | 6.67:1 | AA | Lc -43.4 | Non-text elements, placeholder text |
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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E1EBF9
oklch(93.7% 0.022 256.7)
-
Step 200
200
#C9DAF5
oklch(88.4% 0.042 259.6)
-
Step 300
300
#A4C2F1
oklch(80.8% 0.074 259.3)
-
Step 400
400
#72A1EB
oklch(70.6% 0.12 259.2)
-
Step 500
500 (this color)
#5591EE
oklch(66% 0.153 258.9)
-
Step 600
600
#2F70D2
oklch(55.7% 0.165 258.7)
-
Step 700
700
#225DB6
oklch(49.1% 0.154 258.9)
-
Step 800
800
#1E4C93
oklch(42.6% 0.127 259.1)
-
Step 900
900
#1E4075
oklch(37.6% 0.099 259)
-
Step 950
950
#122645
oklch(27% 0.064 258.9)
#5591EE 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) | #6799F2 | 0.030 |
| Deuteranopia (no green cones) | #518BEC | 0.017 |
| Tritanopia (no blue cones) | #00A6B4 | 0.125 |
| Achromatopsia (no color) | #919191 | 0.153 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5591EE
#5591EE
oklch(66% 0.153 258.9)
- #BF8600
#BF8600
oklch(66% 0.137 78.6)
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 #5591EE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.014
- Cornflower Blue #6495ED ΔE 0.020
- Dark Sky Blue #448EE4 ΔE 0.023
- Soft Blue #6488EA ΔE 0.025
- Dodger Blue #1E90FF ΔE 0.042
- Cornflower #6A79F7 ΔE 0.065
- Lavender Blue #8B88F8 ΔE 0.068
- Perrywinkle #8F8CE7 ΔE 0.068
Use #5591EE 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.