#599DFB
Closest named color: Cornflower Blue (#6495ED). oklch(69.4% 0.155 256.9), rgb(89, 157, 251).
Aa
Black text reads best on this color (7.64:1).
About this color
#599DFB is a medium-light, vivid blue. In OKLCH its lightness is 69%, its chroma 0.155 and its hue 257°. 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 7.64:1.
| Hue family | Blues |
| Lightness | medium-light (69%) |
| Chroma | vivid (0.155) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 7.64:1 |
| White text | 2.74:1 |
Values
| HEX | #599DFB |
| RGB | rgb(89, 157, 251) |
| HSL | hsl(215, 95%, 67%) |
| OKLCH | oklch(69.4% 0.155 256.9) |
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 #599DFB | 2.74:1 | Fails | Lc -58.1 | Large or bold text, headings |
| Black text on #599DFB | 7.64:1 | AAA | Lc 51.2 | Large or bold text, headings |
| #599DFB text on white | 2.74:1 | Fails | Lc 52.8 | Large or bold text, headings |
| #599DFB text on black | 7.64:1 | AAA | Lc -49.0 | 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
#F0F6FE
oklch(97.1% 0.012 255.5)
-
Step 100
100
#DEEBFD
oklch(93.6% 0.028 256.5)
-
Step 200
200
#C3DBFD
oklch(88.5% 0.054 257.1)
-
Step 300
300
#98C3FF
oklch(80.9% 0.097 256.8)
-
Step 400
400 (this color)
#599DFB
oklch(69.4% 0.155 256.9)
-
Step 500
500
#2786FE
oklch(63.2% 0.198 256.8)
-
Step 600
600
#006EE3
oklch(55.7% 0.197 256.9)
-
Step 700
700
#005CC0
oklch(49.1% 0.174 256.9)
-
Step 800
800
#004B9F
oklch(42.7% 0.151 256.9)
-
Step 900
900
#043F84
oklch(37.8% 0.129 256.8)
-
Step 950
950
#07254D
oklch(26.9% 0.082 257.1)
#599DFB 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) | #73A4FF | 0.034 |
| Deuteranopia (no green cones) | #5C95F9 | 0.020 |
| Tritanopia (no blue cones) | #00B3C0 | 0.127 |
| Achromatopsia (no color) | #9C9C9C | 0.155 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #599DFB
#599DFB
oklch(69.4% 0.155 256.9)
- #CE8E00
#CE8E00
oklch(69.3% 0.145 76.8)
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 #599DFB, 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 0.032
- Dark Sky Blue #448EE4 ΔE 0.055
- Soft Blue #6488EA ΔE 0.055
- Dodger Blue #1E90FF ΔE 0.056
- Periwinkle Blue #8F99FB ΔE 0.060
- Perrywinkle #8F8CE7 ΔE 0.072
- Lavender Blue #8B88F8 ΔE 0.072
Use #599DFB 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.