#01B4FE
Closest named color: Deep Sky Blue (#00BFFF). oklch(73% 0.159 237), rgb(1, 180, 254).
Aa
Black text reads best on this color (8.96:1).
About this color
#01B4FE is a medium-light, vivid blue. In OKLCH its lightness is 73%, its chroma 0.159 and its hue 237°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.030 away. Black text reads best on it, at 8.96:1.
| Hue family | Blues |
| Lightness | medium-light (73%) |
| Chroma | vivid (0.159) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 8.96:1 |
| White text | 2.34:1 |
Values
| HEX | #01B4FE |
| RGB | rgb(1, 180, 254) |
| HSL | hsl(198, 99%, 50%) |
| OKLCH | oklch(73% 0.159 237) |
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 #01B4FE | 2.34:1 | Fails | Lc -50.4 | Large or bold text, headings |
| Black text on #01B4FE | 8.96:1 | AAA | Lc 58.5 | Large or bold text, headings |
| #01B4FE text on white | 2.34:1 | Fails | Lc 45.5 | Large or bold text, headings |
| #01B4FE text on black | 8.96:1 | AAA | Lc -56.6 | 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
#D9EDFB
oklch(93.6% 0.028 238.2)
-
Step 200
200
#B8DFFA
oklch(88.5% 0.055 238.5)
-
Step 300
300
#80CBF9
oklch(81% 0.099 236.7)
-
Step 400
400 (this color)
#01B4FE
oklch(73% 0.159 237)
-
Step 500
500
#0094D2
oklch(63.2% 0.138 237.1)
-
Step 600
600
#007CB1
oklch(55.6% 0.122 237.2)
-
Step 700
700
#006895
oklch(49% 0.107 237)
-
Step 800
800
#00557B
oklch(42.6% 0.093 237.2)
-
Step 900
900
#004767
oklch(37.7% 0.082 236.6)
-
Step 950
950
#002A3F
oklch(27% 0.059 236.5)
#01B4FE 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) | #90B4FF | 0.089 |
| Deuteranopia (no green cones) | #72A1FD | 0.071 |
| Tritanopia (no blue cones) | #00C7CE | 0.100 |
| Achromatopsia (no color) | #A9A9A9 | 0.159 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #01B4FE
#01B4FE
oklch(73% 0.159 237)
- #F18A2E
#F18A2E
oklch(73.1% 0.159 57)
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 #01B4FE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.030
- Bright Sky Blue #02CCFE ΔE 0.067
- Vivid Sky Blue #4CC9F0 ΔE 0.074
- Chefchaouen Blue #4895EF ΔE 0.081
- Carolina Blue #8AB8FE ΔE 0.083
- Cornflower Blue #6495ED ΔE 0.086
- Turquoise Blue #06B1C4 ΔE 0.086
- Lightblue #7BC8F6 ΔE 0.092
Use #01B4FE 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.