#5B99DD
Closest named color: Cornflower Blue (#6495ED). oklch(67% 0.12 252), rgb(91, 153, 221).
Aa
Black text reads best on this color (7.04:1).
About this color
#5B99DD is a medium-light, moderately saturated blue. In OKLCH its lightness is 67%, its chroma 0.120 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.030 away. Black text reads best on it, at 7.04:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | moderately saturated (0.120) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 7.04:1 |
| White text | 2.98:1 |
Values
| HEX | #5B99DD |
| RGB | rgb(91, 153, 221) |
| HSL | hsl(211, 66%, 61%) |
| OKLCH | oklch(67% 0.12 252) |
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 #5B99DD | 2.98:1 | Fails | Lc -61.6 | Content text, not long reading |
| Black text on #5B99DD | 7.04:1 | AAA | Lc 47.8 | Large or bold text, headings |
| #5B99DD text on white | 2.98:1 | Fails | Lc 56.2 | Large or bold text, headings |
| #5B99DD text on black | 7.04:1 | AAA | Lc -45.5 | 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 400.
-
Step 50
50
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E0EBF8
oklch(93.6% 0.021 252.5)
-
Step 200
200
#C6DCF5
oklch(88.6% 0.042 251.7)
-
Step 300
300
#9EC4F0
oklch(80.8% 0.075 252.4)
-
Step 400
400 (this color)
#5B99DD
oklch(67% 0.12 252)
-
Step 500
500
#378CE3
oklch(63.1% 0.154 252.1)
-
Step 600
600
#0074D0
oklch(55.6% 0.166 251.9)
-
Step 700
700
#0061B0
oklch(49% 0.147 252)
-
Step 800
800
#004F92
oklch(42.6% 0.129 252.3)
-
Step 900
900
#0F4375
oklch(37.8% 0.1 251.8)
-
Step 950
950
#0B2744
oklch(26.9% 0.064 252.1)
#5B99DD 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) | #7C9CE0 | 0.038 |
| Deuteranopia (no green cones) | #6B90DC | 0.027 |
| Tritanopia (no blue cones) | #00A9B1 | 0.101 |
| Achromatopsia (no color) | #959595 | 0.120 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B99DD
#5B99DD
oklch(67% 0.12 252)
- #C38835
#C38835
oklch(67.1% 0.121 71.9)
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 #5B99DD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.030
- Chefchaouen Blue #4895EF ΔE 0.035
- Dark Sky Blue #448EE4 ΔE 0.042
- Soft Blue #6488EA ΔE 0.053
- Faded Blue #658CBB ΔE 0.055
- Perrywinkle #8F8CE7 ΔE 0.071
- Dodger Blue #1E90FF ΔE 0.072
- Greyblue #77A1B5 ΔE 0.075
Use #5B99DD 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.