#1BB5E7
Closest named color: Deep Sky Blue (#00BFFF). oklch(72.2% 0.135 227.4), rgb(27, 181, 231).
Aa
Black text reads best on this color (8.81:1).
About this color
#1BB5E7 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 72%, its chroma 0.135 and its hue 227°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.039 away. Black text reads best on it, at 8.81:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (72%) |
| Chroma | moderately saturated (0.135) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 8.81:1 |
| White text | 2.38:1 |
Values
| HEX | #1BB5E7 |
| RGB | rgb(27, 181, 231) |
| HSL | hsl(195, 81%, 51%) |
| OKLCH | oklch(72.2% 0.135 227.4) |
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 #1BB5E7 | 2.38:1 | Fails | Lc -51.3 | Large or bold text, headings |
| Black text on #1BB5E7 | 8.81:1 | AAA | Lc 57.6 | Large or bold text, headings |
| #1BB5E7 text on white | 2.38:1 | Fails | Lc 46.4 | Large or bold text, headings |
| #1BB5E7 text on black | 8.81:1 | AAA | Lc -55.6 | 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
#EEF7FB
oklch(97.1% 0.011 226)
-
Step 100
100
#DAEEF7
oklch(93.7% 0.024 226.5)
-
Step 200
200
#BAE0F2
oklch(88.5% 0.047 228.2)
-
Step 300
300
#84CCEB
oklch(80.9% 0.084 227.1)
-
Step 400
400 (this color)
#1BB5E7
oklch(72.2% 0.135 227.4)
-
Step 500
500
#0097C3
oklch(63.1% 0.123 227.5)
-
Step 600
600
#007FA4
oklch(55.6% 0.108 227.1)
-
Step 700
700
#006B8B
oklch(49.2% 0.095 227.3)
-
Step 800
800
#005772
oklch(42.6% 0.083 227.6)
-
Step 900
900
#004960
oklch(37.8% 0.073 227.3)
-
Step 950
950
#002B3A
oklch(27% 0.052 227.2)
#1BB5E7 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) | #9AB2E9 | 0.098 |
| Deuteranopia (no green cones) | #81A0E6 | 0.084 |
| Tritanopia (no blue cones) | #00C3C6 | 0.072 |
| Achromatopsia (no color) | #A8A8A8 | 0.136 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1BB5E7
#1BB5E7
oklch(72.2% 0.135 227.4)
- #E98956
#E98956
oklch(72.3% 0.135 47.6)
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 #1BB5E7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.039
- Turquoise Blue #06B1C4 ΔE 0.052
- Vivid Sky Blue #4CC9F0 ΔE 0.063
- Bright Sky Blue #02CCFE ΔE 0.064
- Dark Turquoise #00CED1 ΔE 0.086
- Lightblue #7BC8F6 ΔE 0.087
- Carolina Blue #8AB8FE ΔE 0.089
- Greyblue #77A1B5 ΔE 0.089
Use #1BB5E7 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.