#6599FB
Closest named color: Cornflower Blue (#6495ED). oklch(69.1% 0.155 262), rgb(101, 153, 251).
Aa
Black text reads best on this color (7.50:1).
About this color
#6599FB is a medium-light, vivid blue. In OKLCH its lightness is 69%, its chroma 0.155 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.022 away. Black text reads best on it, at 7.50:1.
| Hue family | Blues |
| Lightness | medium-light (69%) |
| Chroma | vivid (0.155) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 7.50:1 |
| White text | 2.79:1 |
Values
| HEX | #6599FB |
| RGB | rgb(101, 153, 251) |
| HSL | hsl(219, 95%, 69%) |
| OKLCH | oklch(69.1% 0.155 262) |
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 #6599FB | 2.79:1 | Fails | Lc -58.9 | Large or bold text, headings |
| Black text on #6599FB | 7.50:1 | AAA | Lc 50.4 | Large or bold text, headings |
| #6599FB text on white | 2.79:1 | Fails | Lc 53.6 | Large or bold text, headings |
| #6599FB text on black | 7.50:1 | AAA | Lc -48.2 | 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
#F1F6FF
oklch(97.2% 0.013 262.4)
-
Step 100
100
#E0EAFD
oklch(93.5% 0.028 263.4)
-
Step 200
200
#C6DAFE
oklch(88.5% 0.054 262.2)
-
Step 300
300
#9FC1FF
oklch(80.9% 0.096 262.2)
-
Step 400
400 (this color)
#6599FB
oklch(69.1% 0.155 262)
-
Step 500
500
#4282FF
oklch(63.2% 0.198 262)
-
Step 600
600
#2267EE
oklch(55.6% 0.215 261.9)
-
Step 700
700
#1654D0
oklch(49.1% 0.201 262.2)
-
Step 800
800
#1546A8
oklch(42.7% 0.166 262.1)
-
Step 900
900
#173C85
oklch(37.6% 0.13 262)
-
Step 950
950
#0F244E
oklch(27% 0.082 262.4)
#6599FB 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) | #6FA2FF | 0.027 |
| Deuteranopia (no green cones) | #5A94F9 | 0.018 |
| Tritanopia (no blue cones) | #00AFBE | 0.133 |
| Achromatopsia (no color) | #9A9A9A | 0.155 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6599FB
#6599FB
oklch(69.1% 0.155 262)
- #C79100
#C79100
oklch(69.1% 0.142 82)
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 #6599FB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.022
- Chefchaouen Blue #4895EF ΔE 0.035
- Soft Blue #6488EA ΔE 0.047
- Periwinkle Blue #8F99FB ΔE 0.050
- Dark Sky Blue #448EE4 ΔE 0.055
- Lavender Blue #8B88F8 ΔE 0.058
- Dodger Blue #1E90FF ΔE 0.059
- Perrywinkle #8F8CE7 ΔE 0.060
Use #6599FB 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.