#5B99DF
Closest named color: Cornflower Blue (#6495ED). oklch(67.1% 0.123 252.7), rgb(91, 153, 223).
Aa
Black text reads best on this color (7.06:1).
About this color
#5B99DF is a medium-light, moderately saturated blue. In OKLCH its lightness is 67%, its chroma 0.123 and its hue 253°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.027 away. Black text reads best on it, at 7.06:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | moderately saturated (0.123) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 7.06:1 |
| White text | 2.97:1 |
Values
| HEX | #5B99DF |
| RGB | rgb(91, 153, 223) |
| HSL | hsl(212, 67%, 62%) |
| OKLCH | oklch(67.1% 0.123 252.7) |
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 #5B99DF | 2.97:1 | Fails | Lc -61.4 | Content text, not long reading |
| Black text on #5B99DF | 7.06:1 | AAA | Lc 47.9 | Large or bold text, headings |
| #5B99DF text on white | 2.97:1 | Fails | Lc 56.1 | Large or bold text, headings |
| #5B99DF text on black | 7.06:1 | AAA | Lc -45.7 | 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
#E0EBF9
oklch(93.6% 0.022 254.4)
-
Step 200
200
#C6DCF5
oklch(88.6% 0.042 251.7)
-
Step 300
300
#9DC4F2
oklch(80.8% 0.078 252.9)
-
Step 400
400 (this color)
#5B99DF
oklch(67.1% 0.123 252.7)
-
Step 500
500
#378BE5
oklch(63% 0.158 253)
-
Step 600
600
#0073D2
oklch(55.5% 0.17 252.7)
-
Step 700
700
#0061B2
oklch(49.2% 0.149 252.5)
-
Step 800
800
#004F93
oklch(42.7% 0.13 252.6)
-
Step 900
900
#0F4276
oklch(37.7% 0.103 253)
-
Step 950
950
#0B2745
oklch(26.9% 0.065 252.8)
#5B99DF 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) | #7C9DE2 | 0.039 |
| Deuteranopia (no green cones) | #6A90DE | 0.027 |
| Tritanopia (no blue cones) | #00A9B2 | 0.103 |
| Achromatopsia (no color) | #969696 | 0.123 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B99DF
#5B99DF
oklch(67.1% 0.123 252.7)
- #C38832
#C38832
oklch(67.1% 0.123 72.6)
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 #5B99DF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.027
- Chefchaouen Blue #4895EF ΔE 0.033
- Dark Sky Blue #448EE4 ΔE 0.041
- Soft Blue #6488EA ΔE 0.052
- Faded Blue #658CBB ΔE 0.057
- Perrywinkle #8F8CE7 ΔE 0.070
- Dodger Blue #1E90FF ΔE 0.070
- Periwinkle Blue #8F99FB ΔE 0.076
Use #5B99DF 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.