#1BB5F5
Closest named color: Deep Sky Blue (#00BFFF). oklch(72.9% 0.147 233.9), rgb(27, 181, 245).
Aa
Black text reads best on this color (8.97:1).
About this color
#1BB5F5 is a medium-light, vivid blue. In OKLCH its lightness is 73%, its chroma 0.147 and its hue 234°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.028 away. Black text reads best on it, at 8.97:1.
| Hue family | Blues |
| Lightness | medium-light (73%) |
| Chroma | vivid (0.147) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 8.97:1 |
| White text | 2.33:1 |
Values
| HEX | #1BB5F5 |
| RGB | rgb(27, 181, 245) |
| HSL | hsl(198, 92%, 53%) |
| OKLCH | oklch(72.9% 0.147 233.9) |
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 #1BB5F5 | 2.33:1 | Fails | Lc -50.4 | Large or bold text, headings |
| Black text on #1BB5F5 | 8.97:1 | AAA | Lc 58.4 | Large or bold text, headings |
| #1BB5F5 text on white | 2.33:1 | Fails | Lc 45.6 | Large or bold text, headings |
| #1BB5F5 text on black | 8.97:1 | AAA | Lc -56.5 | 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
#D9EDF9
oklch(93.5% 0.027 234)
-
Step 200
200
#B9E0F6
oklch(88.6% 0.051 232.8)
-
Step 300
300
#82CBF3
oklch(80.9% 0.092 233.5)
-
Step 400
400 (this color)
#1BB5F5
oklch(72.9% 0.147 233.9)
-
Step 500
500
#0095CC
oklch(63.1% 0.132 233.7)
-
Step 600
600
#007DAC
oklch(55.5% 0.116 233.8)
-
Step 700
700
#006992
oklch(49.1% 0.103 234.3)
-
Step 800
800
#005678
oklch(42.7% 0.089 233.9)
-
Step 900
900
#004865
oklch(37.8% 0.079 233.7)
-
Step 950
950
#002A3E
oklch(26.9% 0.057 235.2)
#1BB5F5 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) | #95B4F8 | 0.091 |
| Deuteranopia (no green cones) | #7AA1F4 | 0.076 |
| Tritanopia (no blue cones) | #00C6CB | 0.089 |
| Achromatopsia (no color) | #A9A9A9 | 0.148 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1BB5F5
#1BB5F5
oklch(72.9% 0.147 233.9)
- #EE8B43
#EE8B43
oklch(73% 0.148 53.8)
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 #1BB5F5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.028
- Bright Sky Blue #02CCFE ΔE 0.062
- Vivid Sky Blue #4CC9F0 ΔE 0.065
- Turquoise Blue #06B1C4 ΔE 0.073
- Carolina Blue #8AB8FE ΔE 0.081
- Chefchaouen Blue #4895EF ΔE 0.085
- Lightblue #7BC8F6 ΔE 0.085
- Cornflower Blue #6495ED ΔE 0.088
Use #1BB5F5 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.