#5B91ED
Closest named color: Cornflower Blue (#6495ED). oklch(66.2% 0.149 260.4), rgb(91, 145, 237).
Aa
Black text reads best on this color (6.71:1).
About this color
#5B91ED 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 Cornflower Blue (#6495ED), ΔE 0.015 away. Black text reads best on it, at 6.71:1.
| Hue family | Blues |
| Lightness | medium-light (66%) |
| Chroma | vivid (0.149) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 6.71:1 |
| White text | 3.12:1 |
Values
| HEX | #5B91ED |
| RGB | rgb(91, 145, 237) |
| HSL | hsl(218, 80%, 64%) |
| OKLCH | oklch(66.2% 0.149 260.4) |
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 #5B91ED | 3.12:1 | AA large text | Lc -63.5 | Content text, not long reading |
| Black text on #5B91ED | 6.71:1 | AA | Lc 46.0 | Large or bold text, headings |
| #5B91ED text on white | 3.12:1 | AA large text | Lc 58.1 | Large or bold text, headings |
| #5B91ED text on black | 6.71:1 | AA | Lc -43.7 | 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
#CADAF5
oklch(88.5% 0.041 260.9)
-
Step 300
300
#A6C2F0
oklch(80.9% 0.072 260.3)
-
Step 400
400
#76A1E9
oklch(70.8% 0.116 260.3)
-
Step 500
500 (this color)
#5B91ED
oklch(66.2% 0.149 260.4)
-
Step 600
600
#366FD0
oklch(55.5% 0.162 260.3)
-
Step 700
700
#295CB5
oklch(49.1% 0.152 260.7)
-
Step 800
800
#234C92
oklch(42.7% 0.124 260.4)
-
Step 900
900
#214074
oklch(37.7% 0.097 260.1)
-
Step 950
950
#142644
oklch(27% 0.061 260.1)
#5B91ED 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) | #6999F1 | 0.028 |
| Deuteranopia (no green cones) | #548BEB | 0.018 |
| Tritanopia (no blue cones) | #00A6B4 | 0.125 |
| Achromatopsia (no color) | #929292 | 0.149 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B91ED
#5B91ED
oklch(66.2% 0.149 260.4)
- #BE8800
#BE8800
oklch(66.3% 0.137 80.4)
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 #5B91ED, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.015
- Chefchaouen Blue #4895EF ΔE 0.018
- Soft Blue #6488EA ΔE 0.024
- Dark Sky Blue #448EE4 ΔE 0.027
- Dodger Blue #1E90FF ΔE 0.047
- Perrywinkle #8F8CE7 ΔE 0.062
- Lavender Blue #8B88F8 ΔE 0.063
- Cornflower #6A79F7 ΔE 0.065
Use #5B91ED 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.