#17C9EA
Closest named color: Vivid Sky Blue (#4CC9F0). oklch(77.1% 0.134 215.6), rgb(23, 201, 234).
Aa
Black text reads best on this color (10.57:1).
About this color
#17C9EA is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 77%, its chroma 0.134 and its hue 216°. Its hue sits on the cool side of the wheel. The nearest named color is Vivid Sky Blue (#4CC9F0), ΔE 0.023 away. Black text reads best on it, at 10.57:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (77%) |
| Chroma | moderately saturated (0.134) |
| Temperature | cool |
| Nearest name | Vivid Sky Blue (#4CC9F0) |
| Black text | 10.57:1 |
| White text | 1.98:1 |
Values
| HEX | #17C9EA |
| RGB | rgb(23, 201, 234) |
| HSL | hsl(189, 83%, 50%) |
| OKLCH | oklch(77.1% 0.134 215.6) |
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 #17C9EA | 1.98:1 | Fails | Lc -42.2 | Non-text elements, placeholder text |
| Black text on #17C9EA | 10.57:1 | AAA | Lc 66.1 | Content text, not long reading |
| #17C9EA text on white | 1.98:1 | Fails | Lc 37.8 | Non-text elements, placeholder text |
| #17C9EA text on black | 10.57:1 | AAA | Lc -64.6 | 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
#E9F9FD
oklch(97.1% 0.018 214.4)
-
Step 100
100
#CEF1FA
oklch(93.6% 0.038 215)
-
Step 200
200
#A0E6F8
oklch(88.5% 0.074 215.6)
-
Step 300
300 (this color)
#17C9EA
oklch(77.1% 0.134 215.6)
-
Step 400
400
#00B3D2
oklch(70.6% 0.125 216)
-
Step 500
500
#009AB4
oklch(63.2% 0.112 215.3)
-
Step 600
600
#008198
oklch(55.6% 0.099 216.1)
-
Step 700
700
#006D80
oklch(49.2% 0.087 215.3)
-
Step 800
800
#005969
oklch(42.7% 0.076 215.4)
-
Step 900
900
#004A58
oklch(37.7% 0.067 215.8)
-
Step 950
950
#002C35
oklch(27% 0.048 215.4)
#17C9EA 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) | #B2C2EC | 0.118 |
| Deuteranopia (no green cones) | #99B0EA | 0.106 |
| Tritanopia (no blue cones) | #00D5D3 | 0.055 |
| Achromatopsia (no color) | #B8B8B8 | 0.134 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #17C9EA
#17C9EA
oklch(77.1% 0.134 215.6)
- #FD9478
#FD9478
oklch(77.1% 0.133 35.8)
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 #17C9EA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vivid Sky Blue #4CC9F0 ΔE 0.023
- Bright Sky Blue #02CCFE ΔE 0.028
- Aqua Blue #02D8E9 ΔE 0.043
- Dark Turquoise #00CED1 ΔE 0.044
- Deep Sky Blue #00BFFF ΔE 0.047
- Medium Turquoise #48D1CC ΔE 0.057
- Lightblue #7BC8F6 ΔE 0.061
- Sky Blue #87CEEB ΔE 0.071
Use #17C9EA 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.