#1BB2EF
Closest named color: Deep Sky Blue (#00BFFF). oklch(71.9% 0.144 233), rgb(27, 178, 239).
Aa
Black text reads best on this color (8.66:1).
About this color
#1BB2EF is a medium-light, vivid blue. In OKLCH its lightness is 72%, its chroma 0.144 and its hue 233°. 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 8.66:1.
| Hue family | Blues |
| Lightness | medium-light (72%) |
| Chroma | vivid (0.144) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 8.66:1 |
| White text | 2.42:1 |
Values
| HEX | #1BB2EF |
| RGB | rgb(27, 178, 239) |
| HSL | hsl(197, 87%, 52%) |
| OKLCH | oklch(71.9% 0.144 233) |
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 #1BB2EF | 2.42:1 | Fails | Lc -52.1 | Large or bold text, headings |
| Black text on #1BB2EF | 8.66:1 | AAA | Lc 56.8 | Large or bold text, headings |
| #1BB2EF text on white | 2.42:1 | Fails | Lc 47.2 | Large or bold text, headings |
| #1BB2EF text on black | 8.66:1 | AAA | Lc -54.9 | 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
#DAEDF9
oklch(93.6% 0.026 235.4)
-
Step 200
200
#B9E0F5
oklch(88.6% 0.05 231.6)
-
Step 300
300
#84CBF1
oklch(80.9% 0.089 232.8)
-
Step 400
400 (this color)
#1BB2EF
oklch(71.9% 0.144 233)
-
Step 500
500
#0095CB
oklch(63% 0.131 233.2)
-
Step 600
600
#007DAB
oklch(55.5% 0.115 233.2)
-
Step 700
700
#006991
oklch(49% 0.102 233.6)
-
Step 800
800
#005677
oklch(42.6% 0.088 233.1)
-
Step 900
900
#004864
oklch(37.8% 0.078 232.8)
-
Step 950
950
#002A3D
oklch(26.9% 0.056 233.8)
#1BB2EF 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) | #93B1F2 | 0.091 |
| Deuteranopia (no green cones) | #799EEE | 0.076 |
| Tritanopia (no blue cones) | #00C2C7 | 0.085 |
| Achromatopsia (no color) | #A6A6A6 | 0.144 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1BB2EF
#1BB2EF
oklch(71.9% 0.144 233)
- #E98845
#E98845
oklch(71.9% 0.144 52.8)
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 #1BB2EF, 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 0.065
- Bright Sky Blue #02CCFE ΔE 0.070
- Vivid Sky Blue #4CC9F0 ΔE 0.071
- Chefchaouen Blue #4895EF ΔE 0.079
- Cornflower Blue #6495ED ΔE 0.083
- Carolina Blue #8AB8FE ΔE 0.087
- Lightblue #7BC8F6 ΔE 0.092
Use #1BB2EF 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.