#599DEF
Closest named color: Cornflower Blue (#6495ED). oklch(68.8% 0.14 254.2), rgb(89, 157, 239).
Aa
Black text reads best on this color (7.49:1).
About this color
#599DEF is a medium-light, vivid blue. In OKLCH its lightness is 69%, its chroma 0.140 and its hue 254°. 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 7.49:1.
| Hue family | Blues |
| Lightness | medium-light (69%) |
| Chroma | vivid (0.140) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 7.49:1 |
| White text | 2.80:1 |
Values
| HEX | #599DEF |
| RGB | rgb(89, 157, 239) |
| HSL | hsl(213, 82%, 64%) |
| OKLCH | oklch(68.8% 0.14 254.2) |
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 #599DEF | 2.80:1 | Fails | Lc -58.9 | Large or bold text, headings |
| Black text on #599DEF | 7.49:1 | AAA | Lc 50.4 | Large or bold text, headings |
| #599DEF text on white | 2.80:1 | Fails | Lc 53.7 | Large or bold text, headings |
| #599DEF text on black | 7.49:1 | 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
#F0F6FD
oklch(97.1% 0.011 252.1)
-
Step 100
100
#DFEBFB
oklch(93.6% 0.025 255.6)
-
Step 200
200
#C4DCF9
oklch(88.6% 0.048 253.2)
-
Step 300
300
#9AC4F9
oklch(80.9% 0.088 254.5)
-
Step 400
400 (this color)
#599DEF
oklch(68.8% 0.14 254.2)
-
Step 500
500
#2989F2
oklch(63% 0.18 254.3)
-
Step 600
600
#0072D8
oklch(55.7% 0.178 254.2)
-
Step 700
700
#005FB7
oklch(49.1% 0.158 254.4)
-
Step 800
800
#004E97
oklch(42.8% 0.136 254.1)
-
Step 900
900
#05417D
oklch(37.7% 0.116 254.1)
-
Step 950
950
#072649
oklch(26.8% 0.074 254.3)
#599DEF 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) | #7AA2F2 | 0.039 |
| Deuteranopia (no green cones) | #6594ED | 0.024 |
| Tritanopia (no blue cones) | #00B0BB | 0.114 |
| Achromatopsia (no color) | #9A9A9A | 0.140 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #599DEF
#599DEF
oklch(68.8% 0.14 254.2)
- #CD8C17
#CD8C17
oklch(68.8% 0.14 74.6)
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 #599DEF, 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 0.028
- Dark Sky Blue #448EE4 ΔE 0.048
- Soft Blue #6488EA ΔE 0.054
- Dodger Blue #1E90FF ΔE 0.061
- Periwinkle Blue #8F99FB ΔE 0.064
- Perrywinkle #8F8CE7 ΔE 0.070
- Lavender Blue #8B88F8 ΔE 0.077
Use #599DEF 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.