#1573EB
Closest named color: Cerulean Blue (#056EEE). oklch(57.5% 0.199 257.8), rgb(21, 115, 235).
Aa
Black text reads best on this color (4.68:1).
About this color
#1573EB is a medium-dark, vivid blue. In OKLCH its lightness is 58%, its chroma 0.199 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean Blue (#056EEE), ΔE 0.015 away. Black text reads best on it, at 4.68:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | vivid (0.199) |
| Temperature | cool |
| Nearest name | Cerulean Blue (#056EEE) |
| Black text | 4.68:1 |
| White text | 4.48:1 |
Values
| HEX | #1573EB |
| RGB | rgb(21, 115, 235) |
| HSL | hsl(214, 84%, 50%) |
| OKLCH | oklch(57.5% 0.199 257.8) |
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 #1573EB | 4.48:1 | AA large text | Lc -75.9 | Fine for body text |
| Black text on #1573EB | 4.68:1 | AA | Lc 33.7 | Non-text elements, placeholder text |
| #1573EB text on white | 4.48:1 | AA large text | Lc 70.4 | Content text, not long reading |
| #1573EB text on black | 4.68:1 | AA | Lc -31.3 | 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
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#DFEBFC
oklch(93.6% 0.026 257)
-
Step 200
200
#C5DBFB
oklch(88.5% 0.05 257.7)
-
Step 300
300
#9DC3FB
oklch(81% 0.09 258)
-
Step 400
400
#65A1F9
oklch(70.7% 0.144 257.9)
-
Step 500
500
#3886F5
oklch(63% 0.183 257.9)
-
Step 600
600 (this color)
#1573EB
oklch(57.5% 0.199 257.8)
-
Step 700
700
#005BC4
oklch(49.2% 0.18 257.7)
-
Step 800
800
#044AA0
oklch(42.6% 0.153 257.8)
-
Step 900
900
#103F7F
oklch(37.6% 0.119 257.7)
-
Step 950
950
#0C264B
oklch(27.2% 0.076 257.8)
#1573EB 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) | #1C81EF | 0.037 |
| Deuteranopia (no green cones) | #006EE9 | 0.015 |
| Tritanopia (no blue cones) | #0091A4 | 0.151 |
| Achromatopsia (no color) | #777777 | 0.199 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1573EB
#1573EB
oklch(57.5% 0.199 257.8)
- #9F6E00
#9F6E00
oklch(57.4% 0.12 77.9)
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 #1573EB, closest first.
No curated palette has a color within ΔE 0.04 of #1573EB.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean Blue #056EEE ΔE 0.015
- Clear Blue #247AFD ΔE 0.033
- Royal Blue #4169E1 ΔE 0.035
- Bright Blue #0165FC ΔE 0.044
- Neon Blue #4361EE ΔE 0.047
- Azul #1D5DEC ΔE 0.052
- Windows Blue #3778BF ΔE 0.072
- Warm Blue #4B57DB ΔE 0.073
Use #1573EB 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.