#019BE5
Closest named color: Chefchaouen Blue (#4895EF). oklch(65.8% 0.152 240.7), rgb(1, 155, 229).
Aa
Black text reads best on this color (6.82:1).
About this color
#019BE5 is a medium-light, vivid blue. In OKLCH its lightness is 66%, its chroma 0.152 and its hue 241°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.036 away. Black text reads best on it, at 6.82:1.
| Hue family | Blues |
| Lightness | medium-light (66%) |
| Chroma | vivid (0.152) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 6.82:1 |
| White text | 3.07:1 |
Values
| HEX | #019BE5 |
| RGB | rgb(1, 155, 229) |
| HSL | hsl(199, 99%, 45%) |
| OKLCH | oklch(65.8% 0.152 240.7) |
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 #019BE5 | 3.07:1 | AA large text | Lc -62.4 | Content text, not long reading |
| Black text on #019BE5 | 6.82:1 | AA | Lc 47.1 | Large or bold text, headings |
| #019BE5 text on white | 3.07:1 | AA large text | Lc 57.0 | Large or bold text, headings |
| #019BE5 text on black | 6.82:1 | AA | Lc -44.8 | Non-text elements, placeholder text |
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
#DEECF7
oklch(93.6% 0.021 241.4)
-
Step 200
200
#C2DDF2
oklch(88.4% 0.041 241.4)
-
Step 300
300
#95C8ED
oklch(81% 0.075 240.3)
-
Step 400
400
#53A9E4
oklch(70.6% 0.12 241.3)
-
Step 500
500 (this color)
#019BE5
oklch(65.8% 0.152 240.7)
-
Step 600
600
#007BB7
oklch(55.7% 0.129 240.7)
-
Step 700
700
#00679A
oklch(49.1% 0.113 240.5)
-
Step 800
800
#00547F
oklch(42.6% 0.099 240.7)
-
Step 900
900
#00466B
oklch(37.7% 0.087 240.8)
-
Step 950
950
#002942
oklch(26.9% 0.063 241.6)
#019BE5 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) | #779DE8 | 0.075 |
| Deuteranopia (no green cones) | #5B8BE4 | 0.057 |
| Tritanopia (no blue cones) | #00AEB5 | 0.102 |
| Achromatopsia (no color) | #939393 | 0.153 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #019BE5
#019BE5
oklch(65.8% 0.152 240.7)
- #D37704
#D37704
oklch(65.8% 0.153 60.4)
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 #019BE5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.036
- Dark Sky Blue #448EE4 ΔE 0.039
- Dodger Blue #1E90FF ΔE 0.053
- Cornflower Blue #6495ED ΔE 0.056
- Water Blue #0E87CC ΔE 0.061
- Soft Blue #6488EA ΔE 0.070
- Faded Blue #658CBB ΔE 0.079
- Cool Blue #4984B8 ΔE 0.082
Use #019BE5 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.