#5B91E7
Closest named color: Cornflower Blue (#6495ED). oklch(65.8% 0.141 259.3), rgb(91, 145, 231).
Aa
Black text reads best on this color (6.64:1).
About this color
#5B91E7 is a medium-light, vivid blue. In OKLCH its lightness is 66%, its chroma 0.141 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.017 away. Black text reads best on it, at 6.64:1.
| Hue family | Blues |
| Lightness | medium-light (66%) |
| Chroma | vivid (0.141) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 6.64:1 |
| White text | 3.15:1 |
Values
| HEX | #5B91E7 |
| RGB | rgb(91, 145, 231) |
| HSL | hsl(217, 74%, 63%) |
| OKLCH | oklch(65.8% 0.141 259.3) |
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 #5B91E7 | 3.15:1 | AA large text | Lc -63.9 | Content text, not long reading |
| Black text on #5B91E7 | 6.64:1 | AA | Lc 45.6 | Large or bold text, headings |
| #5B91E7 text on white | 3.15:1 | AA large text | Lc 58.5 | Large or bold text, headings |
| #5B91E7 text on black | 6.64:1 | AA | Lc -43.3 | 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
#CADAF3
oklch(88.4% 0.039 259.3)
-
Step 300
300
#A6C2EE
oklch(80.9% 0.07 259.3)
-
Step 400
400
#77A1E5
oklch(70.6% 0.11 259.7)
-
Step 500
500 (this color)
#5B91E7
oklch(65.8% 0.141 259.3)
-
Step 600
600
#3770CB
oklch(55.5% 0.153 259.4)
-
Step 700
700
#2A5EB0
oklch(49.2% 0.142 259.3)
-
Step 800
800
#244D8E
oklch(42.7% 0.117 259.3)
-
Step 900
900
#224172
oklch(37.8% 0.092 259.2)
-
Step 950
950
#142643
oklch(27% 0.059 259.5)
#5B91E7 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) | #6C98EA | 0.028 |
| Deuteranopia (no green cones) | #598BE5 | 0.016 |
| Tritanopia (no blue cones) | #00A4B1 | 0.119 |
| Achromatopsia (no color) | #919191 | 0.141 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B91E7
#5B91E7
oklch(65.8% 0.141 259.3)
- #BE8600
#BE8600
oklch(65.9% 0.137 79.1)
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 #5B91E7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.017
- Chefchaouen Blue #4895EF ΔE 0.020
- Dark Sky Blue #448EE4 ΔE 0.024
- Soft Blue #6488EA ΔE 0.026
- Dodger Blue #1E90FF ΔE 0.052
- Perrywinkle #8F8CE7 ΔE 0.063
- Faded Blue #658CBB ΔE 0.065
- Lavender Blue #8B88F8 ΔE 0.067
Use #5B91E7 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.