#18B8FD
Closest named color: Deep Sky Blue (#00BFFF). oklch(74% 0.153 235.3), rgb(24, 184, 253).
Aa
Black text reads best on this color (9.31:1).
About this color
#18B8FD is a medium-light, vivid blue. In OKLCH its lightness is 74%, its chroma 0.153 and its hue 235°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.018 away. Black text reads best on it, at 9.31:1.
| Hue family | Blues |
| Lightness | medium-light (74%) |
| Chroma | vivid (0.153) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 9.31:1 |
| White text | 2.25:1 |
Values
| HEX | #18B8FD |
| RGB | rgb(24, 184, 253) |
| HSL | hsl(198, 98%, 54%) |
| OKLCH | oklch(74% 0.153 235.3) |
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 #18B8FD | 2.25:1 | Fails | Lc -48.6 | Large or bold text, headings |
| Black text on #18B8FD | 9.31:1 | AAA | Lc 60.1 | Content text, not long reading |
| #18B8FD text on white | 2.25:1 | Fails | Lc 43.8 | Non-text elements, placeholder text |
| #18B8FD text on black | 9.31:1 | AAA | Lc -58.3 | 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
#EEF7FD
oklch(97.1% 0.013 236.6)
-
Step 100
100
#D9EDFA
oklch(93.5% 0.028 236.2)
-
Step 200
200
#B8E0F8
oklch(88.6% 0.053 234.5)
-
Step 300
300
#81CBF6
oklch(81% 0.096 235.2)
-
Step 400
400 (this color)
#18B8FD
oklch(74% 0.153 235.3)
-
Step 500
500
#0094CF
oklch(63% 0.135 235.8)
-
Step 600
600
#007DAE
oklch(55.7% 0.118 234.9)
-
Step 700
700
#006993
oklch(49.2% 0.104 234.9)
-
Step 800
800
#005679
oklch(42.8% 0.09 234.7)
-
Step 900
900
#004766
oklch(37.6% 0.081 235.8)
-
Step 950
950
#002A3E
oklch(26.9% 0.057 235.2)
#18B8FD 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) | #96B7FF | 0.091 |
| Deuteranopia (no green cones) | #79A4FC | 0.074 |
| Tritanopia (no blue cones) | #00CAD0 | 0.095 |
| Achromatopsia (no color) | #ADADAD | 0.154 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #18B8FD
#18B8FD
oklch(74% 0.153 235.3)
- #F38D3D
#F38D3D
oklch(73.9% 0.154 55.1)
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 #18B8FD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.018
- Bright Sky Blue #02CCFE ΔE 0.055
- Vivid Sky Blue #4CC9F0 ΔE 0.062
- Carolina Blue #8AB8FE ΔE 0.077
- Lightblue #7BC8F6 ΔE 0.080
- Turquoise Blue #06B1C4 ΔE 0.084
- Sky #82CAFC ΔE 0.088
- Chefchaouen Blue #4895EF ΔE 0.091
Use #18B8FD 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.