#15A4E3
Closest named color: Chefchaouen Blue (#4895EF). oklch(68% 0.142 235.7), rgb(21, 164, 227).
Aa
Black text reads best on this color (7.45:1).
About this color
#15A4E3 is a medium-light, vivid blue. In OKLCH its lightness is 68%, its chroma 0.142 and its hue 236°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.051 away. Black text reads best on it, at 7.45:1.
| Hue family | Blues |
| Lightness | medium-light (68%) |
| Chroma | vivid (0.142) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 7.45:1 |
| White text | 2.81:1 |
Values
| HEX | #15A4E3 |
| RGB | rgb(21, 164, 227) |
| HSL | hsl(198, 83%, 49%) |
| OKLCH | oklch(68% 0.142 235.7) |
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 #15A4E3 | 2.81:1 | Fails | Lc -58.8 | Large or bold text, headings |
| Black text on #15A4E3 | 7.45:1 | AAA | Lc 50.5 | Large or bold text, headings |
| #15A4E3 text on white | 2.81:1 | Fails | Lc 53.6 | Large or bold text, headings |
| #15A4E3 text on black | 7.45:1 | AAA | Lc -48.3 | 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
#BBDFF6
oklch(88.5% 0.049 236.2)
-
Step 300
300
#87CAF2
oklch(80.9% 0.088 235.6)
-
Step 400
400 (this color)
#15A4E3
oklch(68% 0.142 235.7)
-
Step 500
500
#0094CF
oklch(63% 0.135 235.8)
-
Step 600
600
#007DAF
oklch(55.7% 0.119 235.4)
-
Step 700
700
#006994
oklch(49.2% 0.105 235.5)
-
Step 800
800
#00567A
oklch(42.8% 0.091 235.4)
-
Step 900
900
#004766
oklch(37.6% 0.081 235.8)
-
Step 950
950
#002A3F
oklch(27% 0.059 236.5)
#15A4E3 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) | #85A4E6 | 0.083 |
| Deuteranopia (no green cones) | #6B92E2 | 0.068 |
| Tritanopia (no blue cones) | #00B4BA | 0.087 |
| Achromatopsia (no color) | #9A9A9A | 0.142 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #15A4E3
#15A4E3
oklch(68% 0.142 235.7)
- #D97E34
#D97E34
oklch(68% 0.142 55.9)
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 #15A4E3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.051
- Dark Sky Blue #448EE4 ΔE 0.061
- Cornflower Blue #6495ED ΔE 0.063
- Turquoise Blue #06B1C4 ΔE 0.067
- Dodger Blue #1E90FF ΔE 0.075
- Deep Sky Blue #00BFFF ΔE 0.077
- Water Blue #0E87CC ΔE 0.083
- Faded Blue #658CBB ΔE 0.084
Use #15A4E3 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.