#5B91EA
Closest named color: Cornflower Blue (#6495ED). oklch(66% 0.145 259.9), rgb(91, 145, 234).
Aa
Black text reads best on this color (6.68:1).
About this color
#5B91EA is a medium-light, vivid blue. In OKLCH its lightness is 66%, its chroma 0.145 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 6.68:1.
| Hue family | Blues |
| Lightness | medium-light (66%) |
| Chroma | vivid (0.145) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 6.68:1 |
| White text | 3.14:1 |
Values
| HEX | #5B91EA |
| RGB | rgb(91, 145, 234) |
| HSL | hsl(217, 77%, 64%) |
| OKLCH | oklch(66% 0.145 259.9) |
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 #5B91EA | 3.14:1 | AA large text | Lc -63.7 | Content text, not long reading |
| Black text on #5B91EA | 6.68:1 | AA | Lc 45.8 | Large or bold text, headings |
| #5B91EA text on white | 3.14:1 | AA large text | Lc 58.3 | Large or bold text, headings |
| #5B91EA 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
#A6C2EF
oklch(80.9% 0.071 259.8)
-
Step 400
400
#76A1E7
oklch(70.7% 0.113 259.8)
-
Step 500
500 (this color)
#5B91EA
oklch(66% 0.145 259.9)
-
Step 600
600
#3770CE
oklch(55.7% 0.157 259.9)
-
Step 700
700
#295DB2
oklch(49.1% 0.146 259.8)
-
Step 800
800
#234C90
oklch(42.6% 0.122 260)
-
Step 900
900
#224073
oklch(37.7% 0.095 260.3)
-
Step 950
950
#142643
oklch(27% 0.059 259.5)
#5B91EA 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) | #6A98EE | 0.026 |
| Deuteranopia (no green cones) | #578BE8 | 0.017 |
| Tritanopia (no blue cones) | #00A5B2 | 0.123 |
| Achromatopsia (no color) | #919191 | 0.145 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B91EA
#5B91EA
oklch(66% 0.145 259.9)
- #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 #5B91EA, 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 0.025
- Dodger Blue #1E90FF ΔE 0.050
- Perrywinkle #8F8CE7 ΔE 0.062
- Lavender Blue #8B88F8 ΔE 0.065
- Cornflower #6A79F7 ΔE 0.067
Use #5B91EA 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.