#5B91EE
Closest named color: Cornflower Blue (#6495ED). oklch(66.2% 0.15 260.6), rgb(91, 145, 238).
Aa
Black text reads best on this color (6.72:1).
About this color
#5B91EE is a medium-light, vivid blue. In OKLCH its lightness is 66%, its chroma 0.150 and its hue 261°. 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 6.72:1.
| Hue family | Blues |
| Lightness | medium-light (66%) |
| Chroma | vivid (0.150) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 6.72:1 |
| White text | 3.12:1 |
Values
| HEX | #5B91EE |
| RGB | rgb(91, 145, 238) |
| HSL | hsl(218, 81%, 65%) |
| OKLCH | oklch(66.2% 0.15 260.6) |
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 #5B91EE | 3.12:1 | AA large text | Lc -63.4 | Content text, not long reading |
| Black text on #5B91EE | 6.72:1 | AA | Lc 46.1 | Large or bold text, headings |
| #5B91EE text on white | 3.12:1 | AA large text | Lc 58.0 | Large or bold text, headings |
| #5B91EE text on black | 6.72:1 | AA | Lc -43.8 | 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
#E2EAF9
oklch(93.5% 0.022 263.2)
-
Step 200
200
#CADAF5
oklch(88.5% 0.041 260.9)
-
Step 300
300
#A6C2F1
oklch(81% 0.073 260.7)
-
Step 400
400
#76A1EA
oklch(70.8% 0.117 260.6)
-
Step 500
500 (this color)
#5B91EE
oklch(66.2% 0.15 260.6)
-
Step 600
600
#366FD1
oklch(55.6% 0.163 260.5)
-
Step 700
700
#295CB5
oklch(49.1% 0.152 260.7)
-
Step 800
800
#234C93
oklch(42.8% 0.126 260.6)
-
Step 900
900
#214075
oklch(37.7% 0.098 260.4)
-
Step 950
950
#142644
oklch(27% 0.061 260.1)
#5B91EE 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) | #6899F2 | 0.027 |
| Deuteranopia (no green cones) | #538CEC | 0.016 |
| Tritanopia (no blue cones) | #00A6B4 | 0.126 |
| Achromatopsia (no color) | #929292 | 0.150 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B91EE
#5B91EE
oklch(66.2% 0.15 260.6)
- #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 #5B91EE, 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 0.028
- Dodger Blue #1E90FF ΔE 0.046
- Perrywinkle #8F8CE7 ΔE 0.062
- Lavender Blue #8B88F8 ΔE 0.063
- Cornflower #6A79F7 ΔE 0.064
Use #5B91EE 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.