#5F99FF
Closest named color: Cornflower Blue (#6495ED). oklch(69.1% 0.163 260.9), rgb(95, 153, 255).
Aa
Black text reads best on this color (7.48:1).
About this color
#5F99FF is a medium-light, vivid blue. In OKLCH its lightness is 69%, its chroma 0.163 and its hue 261°. 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 7.48:1.
| Hue family | Blues |
| Lightness | medium-light (69%) |
| Chroma | vivid (0.163) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 7.48:1 |
| White text | 2.80:1 |
Values
| HEX | #5F99FF |
| RGB | rgb(95, 153, 255) |
| HSL | hsl(218, 100%, 69%) |
| OKLCH | oklch(69.1% 0.163 260.9) |
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 #5F99FF | 2.80:1 | Fails | Lc -59.0 | Large or bold text, headings |
| Black text on #5F99FF | 7.48:1 | AAA | Lc 50.3 | Large or bold text, headings |
| #5F99FF text on white | 2.80:1 | Fails | Lc 53.7 | Large or bold text, headings |
| #5F99FF text on black | 7.48:1 | AAA | Lc -48.1 | 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
#F0F6FF
oklch(97.1% 0.014 258.3)
-
Step 100
100
#DFEBFE
oklch(93.7% 0.029 259.6)
-
Step 200
200
#C5DAFF
oklch(88.5% 0.056 261.8)
-
Step 300
300
#9EC2FF
oklch(81% 0.095 260.8)
-
Step 400
400 (this color)
#5F99FF
oklch(69.1% 0.163 260.9)
-
Step 500
500
#3D83FF
oklch(63.2% 0.198 260.8)
-
Step 600
600
#1166F4
oklch(55.6% 0.226 260.9)
-
Step 700
700
#0154D5
oklch(49.2% 0.21 260.9)
-
Step 800
800
#0845AC
oklch(42.6% 0.175 261)
-
Step 900
900
#113C88
oklch(37.7% 0.136 260.9)
-
Step 950
950
#0B244F
oklch(27% 0.085 260.5)
#5F99FF 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) | #6BA2FF | 0.028 |
| Deuteranopia (no green cones) | #5493FD | 0.020 |
| Tritanopia (no blue cones) | #00B0C0 | 0.135 |
| Achromatopsia (no color) | #9A9A9A | 0.163 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5F99FF
#5F99FF
oklch(69.1% 0.163 260.9)
- #C89000
#C89000
oklch(69% 0.143 80.8)
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 #5F99FF, 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 0.034
- Soft Blue #6488EA ΔE 0.049
- Dodger Blue #1E90FF ΔE 0.053
- Periwinkle Blue #8F99FB ΔE 0.055
- Dark Sky Blue #448EE4 ΔE 0.055
- Lavender Blue #8B88F8 ΔE 0.062
- Perrywinkle #8F8CE7 ΔE 0.066
Use #5F99FF 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.