#1579E8
Closest named color: Cerulean Blue (#056EEE). oklch(58.6% 0.188 255.8), rgb(21, 121, 232).
Aa
Black text reads best on this color (4.93:1).
About this color
#1579E8 is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.188 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean Blue (#056EEE), ΔE 0.031 away. Black text reads best on it, at 4.93:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.188) |
| Temperature | cool |
| Nearest name | Cerulean Blue (#056EEE) |
| Black text | 4.93:1 |
| White text | 4.25:1 |
Values
| HEX | #1579E8 |
| RGB | rgb(21, 121, 232) |
| HSL | hsl(212, 83%, 50%) |
| OKLCH | oklch(58.6% 0.188 255.8) |
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 #1579E8 | 4.25:1 | AA large text | Lc -74.2 | Content text, not long reading |
| Black text on #1579E8 | 4.93:1 | AA | Lc 35.3 | Non-text elements, placeholder text |
| #1579E8 text on white | 4.25:1 | AA large text | Lc 68.7 | Content text, not long reading |
| #1579E8 text on black | 4.93:1 | AA | Lc -32.9 | 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 600.
-
Step 50
50
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#DFEBFB
oklch(93.6% 0.025 255.6)
-
Step 200
200
#C5DBF9
oklch(88.5% 0.048 256.2)
-
Step 300
300
#9DC3F7
oklch(80.8% 0.085 256.3)
-
Step 400
400
#65A2F3
oklch(70.6% 0.135 256)
-
Step 500
500
#3689EF
oklch(63.2% 0.173 255.6)
-
Step 600
600 (this color)
#1579E8
oklch(58.6% 0.188 255.8)
-
Step 700
700
#005EBC
oklch(49.2% 0.166 255.7)
-
Step 800
800
#004C9C
oklch(42.7% 0.146 256)
-
Step 900
900
#0F407C
oklch(37.6% 0.114 256.2)
-
Step 950
950
#0B2648
oklch(26.9% 0.071 255.8)
#1579E8 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) | #3684EC | 0.036 |
| Deuteranopia (no green cones) | #0072E6 | 0.020 |
| Tritanopia (no blue cones) | #0094A5 | 0.141 |
| Achromatopsia (no color) | #7B7B7B | 0.188 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1579E8
#1579E8
oklch(58.6% 0.188 255.8)
- #A57000
#A57000
oklch(58.6% 0.123 76.1)
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 #1579E8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean Blue #056EEE ΔE 0.031
- Clear Blue #247AFD ΔE 0.033
- Royal Blue #4169E1 ΔE 0.043
- Bright Blue #0165FC ΔE 0.059
- Neon Blue #4361EE ΔE 0.061
- Water Blue #0E87CC ΔE 0.062
- Windows Blue #3778BF ΔE 0.064
- Dodger Blue #1E90FF ΔE 0.067
Use #1579E8 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.