#5B99DA
Closest named color: Cornflower Blue (#6495ED). oklch(66.9% 0.117 251), rgb(91, 153, 218).
Aa
Black text reads best on this color (7.01:1).
About this color
#5B99DA is a medium-light, moderately saturated blue. In OKLCH its lightness is 67%, its chroma 0.117 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.034 away. Black text reads best on it, at 7.01:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | moderately saturated (0.117) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 7.01:1 |
| White text | 2.99:1 |
Values
| HEX | #5B99DA |
| RGB | rgb(91, 153, 218) |
| HSL | hsl(211, 63%, 61%) |
| OKLCH | oklch(66.9% 0.117 251) |
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 #5B99DA | 2.99:1 | Fails | Lc -61.8 | Content text, not long reading |
| Black text on #5B99DA | 7.01:1 | AAA | Lc 47.6 | Large or bold text, headings |
| #5B99DA text on white | 2.99:1 | Fails | Lc 56.4 | Large or bold text, headings |
| #5B99DA text on black | 7.01:1 | AAA | Lc -45.4 | Large or bold text, headings |
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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E2EBF5
oklch(93.6% 0.017 250.8)
-
Step 200
200
#CADBEE
oklch(88.5% 0.032 251.1)
-
Step 300
300
#A6C4E5
oklch(80.9% 0.057 251)
-
Step 400
400
#75A5D8
oklch(70.8% 0.091 250.7)
-
Step 500
500 (this color)
#5B99DA
oklch(66.9% 0.117 251)
-
Step 600
600
#3176BA
oklch(55.5% 0.127 250.9)
-
Step 700
700
#2363A1
oklch(49.1% 0.118 251)
-
Step 800
800
#1F5182
oklch(42.7% 0.097 250.8)
-
Step 900
900
#1F4368
oklch(37.5% 0.076 251.1)
-
Step 950
950
#13283D
oklch(27.1% 0.048 250)
#5B99DA 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) | #7E9CDD | 0.041 |
| Deuteranopia (no green cones) | #6D8FD9 | 0.031 |
| Tritanopia (no blue cones) | #00A8B0 | 0.098 |
| Achromatopsia (no color) | #959595 | 0.117 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B99DA
#5B99DA
oklch(66.9% 0.117 251)
- #C2883A
#C2883A
oklch(67% 0.117 71.2)
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 #5B99DA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.034
- Chefchaouen Blue #4895EF ΔE 0.039
- Dark Sky Blue #448EE4 ΔE 0.044
- Faded Blue #658CBB ΔE 0.051
- Soft Blue #6488EA ΔE 0.056
- Greyblue #77A1B5 ΔE 0.071
- Perrywinkle #8F8CE7 ΔE 0.073
- Cool Blue #4984B8 ΔE 0.075
Use #5B99DA 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.