#1B71E1
Closest named color: Cerulean Blue (#056EEE). oklch(56.5% 0.188 257.6), rgb(27, 113, 225).
Aa
White text reads best on this color (4.67:1).
About this color
#1B71E1 is a medium-dark, vivid blue. In OKLCH its lightness is 56%, its chroma 0.188 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean Blue (#056EEE), ΔE 0.023 away. White text reads best on it, at 4.67:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.188) |
| Temperature | cool |
| Nearest name | Cerulean Blue (#056EEE) |
| Black text | 4.49:1 |
| White text | 4.67:1 |
Values
| HEX | #1B71E1 |
| RGB | rgb(27, 113, 225) |
| HSL | hsl(214, 79%, 49%) |
| OKLCH | oklch(56.5% 0.188 257.6) |
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 #1B71E1 | 4.67:1 | AA | Lc -77.2 | Fine for body text |
| Black text on #1B71E1 | 4.49:1 | AA large text | Lc 32.3 | Non-text elements, placeholder text |
| #1B71E1 text on white | 4.67:1 | AA | Lc 71.8 | Content text, not long reading |
| #1B71E1 text on black | 4.49:1 | AA large text | Lc -29.9 | Dividers and decoration only |
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
#E0EBFB
oklch(93.7% 0.025 257.6)
-
Step 200
200
#C6DBF9
oklch(88.5% 0.047 257.3)
-
Step 300
300
#9EC3F7
oklch(80.9% 0.084 256.9)
-
Step 400
400
#69A2F4
oklch(70.8% 0.135 257.5)
-
Step 500
500
#3E87EF
oklch(63% 0.173 257.8)
-
Step 600
600 (this color)
#1B71E1
oklch(56.5% 0.188 257.6)
-
Step 700
700
#065BC1
oklch(49% 0.175 257.8)
-
Step 800
800
#0C4B9C
oklch(42.6% 0.145 257.7)
-
Step 900
900
#14407C
oklch(37.8% 0.113 257.5)
-
Step 950
950
#0D2649
oklch(27.1% 0.072 257.4)
#1B71E1 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) | #287DE5 | 0.033 |
| Deuteranopia (no green cones) | #006CDF | 0.017 |
| Tritanopia (no blue cones) | #008C9E | 0.142 |
| Achromatopsia (no color) | #747474 | 0.188 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B71E1
#1B71E1
oklch(56.5% 0.188 257.6)
- #9C6B00
#9C6B00
oklch(56.5% 0.118 77.2)
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 #1B71E1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean Blue #056EEE ΔE 0.023
- Royal Blue #4169E1 ΔE 0.029
- Clear Blue #247AFD ΔE 0.048
- Neon Blue #4361EE ΔE 0.049
- Azul #1D5DEC ΔE 0.052
- Bright Blue #0165FC ΔE 0.052
- Windows Blue #3778BF ΔE 0.061
- Warm Blue #4B57DB ΔE 0.066
Use #1B71E1 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.