#17C5EF
Closest named color: Vivid Sky Blue (#4CC9F0). oklch(76.3% 0.137 221), rgb(23, 197, 239).
Aa
Black text reads best on this color (10.26:1).
About this color
#17C5EF is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 76%, its chroma 0.137 and its hue 221°. Its hue sits on the cool side of the wheel. The nearest named color is Vivid Sky Blue (#4CC9F0), ΔE 0.025 away. Black text reads best on it, at 10.26:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (76%) |
| Chroma | moderately saturated (0.137) |
| Temperature | cool |
| Nearest name | Vivid Sky Blue (#4CC9F0) |
| Black text | 10.26:1 |
| White text | 2.04:1 |
Values
| HEX | #17C5EF |
| RGB | rgb(23, 197, 239) |
| HSL | hsl(192, 87%, 51%) |
| OKLCH | oklch(76.3% 0.137 221) |
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 #17C5EF | 2.04:1 | Fails | Lc -43.7 | Non-text elements, placeholder text |
| Black text on #17C5EF | 10.26:1 | AAA | Lc 64.7 | Content text, not long reading |
| #17C5EF text on white | 2.04:1 | Fails | Lc 39.2 | Non-text elements, placeholder text |
| #17C5EF text on black | 10.26:1 | AAA | Lc -63.1 | 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
#CEF1FD
oklch(93.7% 0.04 220.5)
-
Step 200
200
#A0E5FD
oklch(88.4% 0.076 221.7)
-
Step 300
300 (this color)
#17C5EF
oklch(76.3% 0.137 221)
-
Step 400
400
#00B2D9
oklch(70.7% 0.13 221)
-
Step 500
500
#0099BA
oklch(63.2% 0.115 220.3)
-
Step 600
600
#00809D
oklch(55.6% 0.102 221.1)
-
Step 700
700
#006C84
oklch(49.2% 0.09 220.2)
-
Step 800
800
#00586D
oklch(42.6% 0.078 221.3)
-
Step 900
900
#00495B
oklch(37.6% 0.069 221.4)
-
Step 950
950
#002C37
oklch(27.1% 0.049 219.4)
#17C5EF 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) | #ACC0F1 | 0.112 |
| Deuteranopia (no green cones) | #92ADEF | 0.099 |
| Tritanopia (no blue cones) | #00D2D3 | 0.063 |
| Achromatopsia (no color) | #B5B5B5 | 0.137 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #17C5EF
#17C5EF
oklch(76.3% 0.137 221)
- #FB926B
#FB926B
oklch(76.3% 0.138 40.9)
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 #17C5EF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vivid Sky Blue #4CC9F0 ΔE 0.025
- Bright Sky Blue #02CCFE ΔE 0.025
- Deep Sky Blue #00BFFF ΔE 0.033
- Aqua Blue #02D8E9 ΔE 0.057
- Dark Turquoise #00CED1 ΔE 0.058
- Lightblue #7BC8F6 ΔE 0.060
- Sky #82CAFC ΔE 0.071
- Medium Turquoise #48D1CC ΔE 0.071
Use #17C5EF 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.