#5F99EF
Closest named color: Cornflower Blue (#6495ED). oklch(68.2% 0.142 258.1), rgb(95, 153, 239).
Aa
Black text reads best on this color (7.28:1).
About this color
#5F99EF is a medium-light, vivid blue. In OKLCH its lightness is 68%, its chroma 0.142 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.011 away. Black text reads best on it, at 7.28:1.
| Hue family | Blues |
| Lightness | medium-light (68%) |
| Chroma | vivid (0.142) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 7.28:1 |
| White text | 2.88:1 |
Values
| HEX | #5F99EF |
| RGB | rgb(95, 153, 239) |
| HSL | hsl(216, 82%, 65%) |
| OKLCH | oklch(68.2% 0.142 258.1) |
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 #5F99EF | 2.88:1 | Fails | Lc -60.1 | Content text, not long reading |
| Black text on #5F99EF | 7.28:1 | AAA | Lc 49.2 | Large or bold text, headings |
| #5F99EF text on white | 2.88:1 | Fails | Lc 54.8 | Large or bold text, headings |
| #5F99EF text on black | 7.28:1 | AAA | Lc -47.0 | 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
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E0EBFB
oklch(93.7% 0.025 257.6)
-
Step 200
200
#C6DBFA
oklch(88.6% 0.048 258)
-
Step 300
300
#9DC3FA
oklch(81% 0.088 257.6)
-
Step 400
400 (this color)
#5F99EF
oklch(68.2% 0.142 258.1)
-
Step 500
500
#3A86F4
oklch(63% 0.181 258.1)
-
Step 600
600
#116DE3
oklch(55.6% 0.197 258)
-
Step 700
700
#005AC5
oklch(49.1% 0.183 258.1)
-
Step 800
800
#084AA0
oklch(42.7% 0.152 258.3)
-
Step 900
900
#123F7F
oklch(37.7% 0.119 258.2)
-
Step 950
950
#0C264A
oklch(27.1% 0.074 257.4)
#5F99EF 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) | #74A0F3 | 0.031 |
| Deuteranopia (no green cones) | #6192ED | 0.018 |
| Tritanopia (no blue cones) | #00ACB9 | 0.119 |
| Achromatopsia (no color) | #989898 | 0.142 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5F99EF
#5F99EF
oklch(68.2% 0.142 258.1)
- #C88C02
#C88C02
oklch(68.2% 0.142 78.2)
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 #5F99EF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.011
- Chefchaouen Blue #4895EF ΔE 0.024
- Dark Sky Blue #448EE4 ΔE 0.043
- Soft Blue #6488EA ΔE 0.044
- Dodger Blue #1E90FF ΔE 0.059
- Periwinkle Blue #8F99FB ΔE 0.060
- Perrywinkle #8F8CE7 ΔE 0.062
- Lavender Blue #8B88F8 ΔE 0.067
Use #5F99EF 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.