#17C5EC
Closest named color: Vivid Sky Blue (#4CC9F0). oklch(76.2% 0.135 219.4), rgb(23, 197, 236).
Aa
Black text reads best on this color (10.23:1).
About this color
#17C5EC is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 76%, its chroma 0.135 and its hue 219°. Its hue sits on the cool side of the wheel. The nearest named color is Vivid Sky Blue (#4CC9F0), ΔE 0.026 away. Black text reads best on it, at 10.23:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (76%) |
| Chroma | moderately saturated (0.135) |
| Temperature | cool |
| Nearest name | Vivid Sky Blue (#4CC9F0) |
| Black text | 10.23:1 |
| White text | 2.05:1 |
Values
| HEX | #17C5EC |
| RGB | rgb(23, 197, 236) |
| HSL | hsl(191, 85%, 51%) |
| OKLCH | oklch(76.2% 0.135 219.4) |
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 #17C5EC | 2.05:1 | Fails | Lc -43.9 | Non-text elements, placeholder text |
| Black text on #17C5EC | 10.23:1 | AAA | Lc 64.5 | Content text, not long reading |
| #17C5EC text on white | 2.05:1 | Fails | Lc 39.4 | Non-text elements, placeholder text |
| #17C5EC text on black | 10.23:1 | AAA | Lc -62.9 | Content text, not long reading |
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 300.
-
Step 50
50
#E9F9FE
oklch(97.2% 0.018 218.4)
-
Step 100
100
#CEF1FC
oklch(93.7% 0.039 218.7)
-
Step 200
200
#A0E6FB
oklch(88.6% 0.075 218.5)
-
Step 300
300 (this color)
#17C5EC
oklch(76.2% 0.135 219.4)
-
Step 400
400
#00B2D7
oklch(70.6% 0.128 219.8)
-
Step 500
500
#0099B8
oklch(63.1% 0.114 219)
-
Step 600
600
#00809B
oklch(55.5% 0.101 219.5)
-
Step 700
700
#006C83
oklch(49.1% 0.089 219.3)
-
Step 800
800
#00586C
oklch(42.6% 0.078 220.2)
-
Step 900
900
#004A5A
oklch(37.8% 0.068 218.5)
-
Step 950
950
#002C37
oklch(27.1% 0.049 219.4)
#17C5EC 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) | #ADBFEE | 0.113 |
| Deuteranopia (no green cones) | #93ADEC | 0.100 |
| Tritanopia (no blue cones) | #00D2D1 | 0.062 |
| Achromatopsia (no color) | #B5B5B5 | 0.136 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #17C5EC
#17C5EC
oklch(76.2% 0.135 219.4)
- #FA926F
#FA926F
oklch(76.3% 0.135 39.3)
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 #17C5EC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vivid Sky Blue #4CC9F0 ΔE 0.026
- Bright Sky Blue #02CCFE ΔE 0.028
- Deep Sky Blue #00BFFF ΔE 0.036
- Dark Turquoise #00CED1 ΔE 0.054
- Aqua Blue #02D8E9 ΔE 0.055
- Lightblue #7BC8F6 ΔE 0.062
- Medium Turquoise #48D1CC ΔE 0.068
- Turquoise Blue #06B1C4 ΔE 0.072
Use #17C5EC 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.