#5B99EC
Closest named color: Cornflower Blue (#6495ED). oklch(67.8% 0.139 256.2), rgb(91, 153, 236).
Aa
Black text reads best on this color (7.21:1).
About this color
#5B99EC is a medium-light, moderately saturated blue. In OKLCH its lightness is 68%, its chroma 0.139 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.013 away. Black text reads best on it, at 7.21:1.
| Hue family | Blues |
| Lightness | medium-light (68%) |
| Chroma | moderately saturated (0.139) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 7.21:1 |
| White text | 2.91:1 |
Values
| HEX | #5B99EC |
| RGB | rgb(91, 153, 236) |
| HSL | hsl(214, 79%, 64%) |
| OKLCH | oklch(67.8% 0.139 256.2) |
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 #5B99EC | 2.91:1 | Fails | Lc -60.6 | Content text, not long reading |
| Black text on #5B99EC | 7.21:1 | AAA | Lc 48.8 | Large or bold text, headings |
| #5B99EC text on white | 2.91:1 | Fails | Lc 55.3 | Large or bold text, headings |
| #5B99EC text on black | 7.21:1 | AAA | Lc -46.5 | 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
#F0F6FD
oklch(97.1% 0.011 252.1)
-
Step 100
100
#DFEBFB
oklch(93.6% 0.025 255.6)
-
Step 200
200
#C5DBFA
oklch(88.5% 0.049 256.9)
-
Step 300
300
#9CC3F9
oklch(80.9% 0.088 256.6)
-
Step 400
400 (this color)
#5B99EC
oklch(67.8% 0.139 256.2)
-
Step 500
500
#3488F2
oklch(63.1% 0.178 256.2)
-
Step 600
600
#006FE0
oklch(55.6% 0.192 256.3)
-
Step 700
700
#005DBD
oklch(49.1% 0.169 256.1)
-
Step 800
800
#004C9D
oklch(42.8% 0.147 256.2)
-
Step 900
900
#0D407D
oklch(37.6% 0.116 256.1)
-
Step 950
950
#0A2649
oklch(26.9% 0.073 255.8)
#5B99EC 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) | #759FEF | 0.034 |
| Deuteranopia (no green cones) | #6291EA | 0.021 |
| Tritanopia (no blue cones) | #00ACB7 | 0.116 |
| Achromatopsia (no color) | #979797 | 0.139 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B99EC
#5B99EC
oklch(67.8% 0.139 256.2)
- #C88A0E
#C88A0E
oklch(67.8% 0.14 76.3)
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 #5B99EC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.013
- Chefchaouen Blue #4895EF ΔE 0.022
- Dark Sky Blue #448EE4 ΔE 0.039
- Soft Blue #6488EA ΔE 0.044
- Dodger Blue #1E90FF ΔE 0.058
- Periwinkle Blue #8F99FB ΔE 0.065
- Perrywinkle #8F8CE7 ΔE 0.065
- Lavender Blue #8B88F8 ΔE 0.072
Use #5B99EC 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.