#1BB4E9
Closest named color: Deep Sky Blue (#00BFFF). oklch(72.1% 0.137 229), rgb(27, 180, 233).
Aa
Black text reads best on this color (8.75:1).
About this color
#1BB4E9 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 72%, its chroma 0.137 and its hue 229°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.038 away. Black text reads best on it, at 8.75:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (72%) |
| Chroma | moderately saturated (0.137) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 8.75:1 |
| White text | 2.39:1 |
Values
| HEX | #1BB4E9 |
| RGB | rgb(27, 180, 233) |
| HSL | hsl(195, 82%, 51%) |
| OKLCH | oklch(72.1% 0.137 229) |
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 #1BB4E9 | 2.39:1 | Fails | Lc -51.7 | Large or bold text, headings |
| Black text on #1BB4E9 | 8.75:1 | AAA | Lc 57.3 | Large or bold text, headings |
| #1BB4E9 text on white | 2.39:1 | Fails | Lc 46.7 | Large or bold text, headings |
| #1BB4E9 text on black | 8.75:1 | AAA | Lc -55.3 | 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
#EEF7FC
oklch(97.1% 0.012 231.7)
-
Step 100
100
#DAEEF7
oklch(93.7% 0.024 226.5)
-
Step 200
200
#BAE0F3
oklch(88.6% 0.048 229.6)
-
Step 300
300
#84CCED
oklch(81% 0.086 228.7)
-
Step 400
400 (this color)
#1BB4E9
oklch(72.1% 0.137 229)
-
Step 500
500
#0097C5
oklch(63.2% 0.124 228.7)
-
Step 600
600
#007EA6
oklch(55.5% 0.11 229.3)
-
Step 700
700
#006A8C
oklch(49% 0.097 229.1)
-
Step 800
800
#005773
oklch(42.7% 0.084 228.5)
-
Step 900
900
#004861
oklch(37.6% 0.075 229.8)
-
Step 950
950
#002B3B
oklch(27% 0.053 228.8)
#1BB4E9 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) | #98B1EC | 0.096 |
| Deuteranopia (no green cones) | #7F9FE8 | 0.083 |
| Tritanopia (no blue cones) | #00C3C6 | 0.077 |
| Achromatopsia (no color) | #A7A7A7 | 0.138 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1BB4E9
#1BB4E9
oklch(72.1% 0.137 229)
- #E98851
#E98851
oklch(72% 0.138 48.9)
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 #1BB4E9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.038
- Turquoise Blue #06B1C4 ΔE 0.055
- Vivid Sky Blue #4CC9F0 ΔE 0.065
- Bright Sky Blue #02CCFE ΔE 0.066
- Chefchaouen Blue #4895EF ΔE 0.087
- Carolina Blue #8AB8FE ΔE 0.088
- Lightblue #7BC8F6 ΔE 0.089
- Greyblue #77A1B5 ΔE 0.090
Use #1BB4E9 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.