#5991EC
Closest named color: Chefchaouen Blue (#4895EF). oklch(66% 0.149 259.7), rgb(89, 145, 236).
Aa
Black text reads best on this color (6.68:1).
About this color
#5991EC is a medium-light, vivid blue. In OKLCH its lightness is 66%, its chroma 0.149 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.016 away. Black text reads best on it, at 6.68:1.
| Hue family | Blues |
| Lightness | medium-light (66%) |
| Chroma | vivid (0.149) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 6.68:1 |
| White text | 3.14:1 |
Values
| HEX | #5991EC |
| RGB | rgb(89, 145, 236) |
| HSL | hsl(217, 79%, 64%) |
| OKLCH | oklch(66% 0.149 259.7) |
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 #5991EC | 3.14:1 | AA large text | Lc -63.6 | Content text, not long reading |
| Black text on #5991EC | 6.68:1 | AA | Lc 45.8 | Large or bold text, headings |
| #5991EC text on white | 3.14:1 | AA large text | Lc 58.2 | Large or bold text, headings |
| #5991EC text on black | 6.68:1 | AA | Lc -43.5 | 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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E2EAF8
oklch(93.5% 0.021 261.8)
-
Step 200
200
#CADAF4
oklch(88.4% 0.04 260.1)
-
Step 300
300
#A5C2F0
oklch(80.9% 0.073 259.5)
-
Step 400
400
#75A1E9
oklch(70.7% 0.117 259.9)
-
Step 500
500 (this color)
#5991EC
oklch(66% 0.149 259.7)
-
Step 600
600
#3470D0
oklch(55.7% 0.161 259.5)
-
Step 700
700
#275DB4
oklch(49.1% 0.15 259.6)
-
Step 800
800
#214C92
oklch(42.6% 0.125 259.7)
-
Step 900
900
#204074
oklch(37.6% 0.097 259.6)
-
Step 950
950
#132644
oklch(27% 0.061 259.2)
#5991EC 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) | #6999F0 | 0.029 |
| Deuteranopia (no green cones) | #548BEA | 0.017 |
| Tritanopia (no blue cones) | #00A6B3 | 0.125 |
| Achromatopsia (no color) | #919191 | 0.149 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5991EC
#5991EC
oklch(66% 0.149 259.7)
- #BE8700
#BE8700
oklch(66.1% 0.137 79.7)
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 #5991EC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.016
- Cornflower Blue #6495ED ΔE 0.017
- Soft Blue #6488EA ΔE 0.024
- Dark Sky Blue #448EE4 ΔE 0.025
- Dodger Blue #1E90FF ΔE 0.046
- Perrywinkle #8F8CE7 ΔE 0.064
- Lavender Blue #8B88F8 ΔE 0.066
- Cornflower #6A79F7 ΔE 0.066
Use #5991EC 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.