#019BF1
Closest named color: Chefchaouen Blue (#4895EF). oklch(66.5% 0.166 244.5), rgb(1, 155, 241).
Aa
Black text reads best on this color (6.96:1).
About this color
#019BF1 is a medium-light, vivid blue. In OKLCH its lightness is 67%, its chroma 0.166 and its hue 245°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.029 away. Black text reads best on it, at 6.96:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | vivid (0.166) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 6.96:1 |
| White text | 3.01:1 |
Values
| HEX | #019BF1 |
| RGB | rgb(1, 155, 241) |
| HSL | hsl(202, 99%, 47%) |
| OKLCH | oklch(66.5% 0.166 244.5) |
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 #019BF1 | 3.01:1 | AA large text | Lc -61.5 | Content text, not long reading |
| Black text on #019BF1 | 6.96:1 | AA | Lc 47.9 | Large or bold text, headings |
| #019BF1 text on white | 3.01:1 | AA large text | Lc 56.2 | Large or bold text, headings |
| #019BF1 text on black | 6.96:1 | AA | Lc -45.6 | 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 500.
-
Step 50
50
#F0F6FC
oklch(97% 0.01 247.9)
-
Step 100
100
#DDECF9
oklch(93.6% 0.024 244.1)
-
Step 200
200
#C1DDF5
oklch(88.5% 0.045 244.2)
-
Step 300
300
#94C7F2
oklch(80.9% 0.081 244.5)
-
Step 400
400
#51A8EB
oklch(70.7% 0.129 244.4)
-
Step 500
500 (this color)
#019BF1
oklch(66.5% 0.166 244.5)
-
Step 600
600
#0079BE
oklch(55.6% 0.139 244.6)
-
Step 700
700
#0066A1
oklch(49.2% 0.123 244.5)
-
Step 800
800
#005385
oklch(42.7% 0.107 244.8)
-
Step 900
900
#00456F
oklch(37.6% 0.093 244.3)
-
Step 950
950
#002945
oklch(27.1% 0.068 244.5)
#019BF1 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) | #719FF5 | 0.068 |
| Deuteranopia (no green cones) | #518CEF | 0.048 |
| Tritanopia (no blue cones) | #00B0BA | 0.115 |
| Achromatopsia (no color) | #949494 | 0.166 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #019BF1
#019BF1
oklch(66.5% 0.166 244.5)
- #D17D00
#D17D00
oklch(66.5% 0.149 64.9)
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 #019BF1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.029
- Dodger Blue #1E90FF ΔE 0.039
- Dark Sky Blue #448EE4 ΔE 0.039
- Cornflower Blue #6495ED ΔE 0.052
- Soft Blue #6488EA ΔE 0.066
- Water Blue #0E87CC ΔE 0.071
- Clear Blue #247AFD ΔE 0.089
- Faded Blue #658CBB ΔE 0.091
Use #019BF1 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.