#1599CD
Closest named color: Water Blue (#0E87CC). oklch(64.3% 0.128 232.4), rgb(21, 153, 205).
Aa
Black text reads best on this color (6.46:1).
About this color
#1599CD is a medium-light, moderately saturated blue. In OKLCH its lightness is 64%, its chroma 0.128 and its hue 232°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.052 away. Black text reads best on it, at 6.46:1.
| Hue family | Blues |
| Lightness | medium-light (64%) |
| Chroma | moderately saturated (0.128) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 6.46:1 |
| White text | 3.24:1 |
Values
| HEX | #1599CD |
| RGB | rgb(21, 153, 205) |
| HSL | hsl(197, 81%, 44%) |
| OKLCH | oklch(64.3% 0.128 232.4) |
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 #1599CD | 3.24:1 | AA large text | Lc -64.6 | Content text, not long reading |
| Black text on #1599CD | 6.46:1 | AA | Lc 44.9 | Non-text elements, placeholder text |
| #1599CD text on white | 3.24:1 | AA large text | Lc 59.2 | Large or bold text, headings |
| #1599CD text on black | 6.46:1 | AA | Lc -42.5 | Non-text elements, placeholder text |
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 500.
-
Step 50
50
#F0F7FA
oklch(97.2% 0.008 225.1)
-
Step 100
100
#DFECF4
oklch(93.6% 0.018 234.5)
-
Step 200
200
#C3DEED
oklch(88.5% 0.035 232.1)
-
Step 300
300
#98C8E3
oklch(80.8% 0.063 233.2)
-
Step 400
400
#5AABD4
oklch(70.6% 0.099 232.6)
-
Step 500
500 (this color)
#1599CD
oklch(64.3% 0.128 232.4)
-
Step 600
600
#007EAA
oklch(55.7% 0.113 231.8)
-
Step 700
700
#006990
oklch(49% 0.101 232.9)
-
Step 800
800
#005677
oklch(42.6% 0.088 233.1)
-
Step 900
900
#004863
oklch(37.7% 0.077 231.8)
-
Step 950
950
#032A3C
oklch(26.9% 0.053 233.9)
#1599CD 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) | #7F98CF | 0.082 |
| Deuteranopia (no green cones) | #6888CC | 0.068 |
| Tritanopia (no blue cones) | #00A7AB | 0.075 |
| Achromatopsia (no color) | #8F8F8F | 0.128 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1599CD
#1599CD
oklch(64.3% 0.128 232.4)
- #C9743B
#C9743B
oklch(64.3% 0.129 52.2)
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 #1599CD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.052
- Blue NCS #118AB2 ΔE 0.054
- Dark Sky Blue #448EE4 ΔE 0.056
- Faded Blue #658CBB ΔE 0.059
- Cool Blue #4984B8 ΔE 0.061
- Chefchaouen Blue #4895EF ΔE 0.063
- Steel Blue #4682B4 ΔE 0.067
- Dusty Blue #5A86AD ΔE 0.068
Use #1599CD 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.