#155DFC
Closest named color: Bright Blue (#0165FC). oklch(54.7% 0.246 262.9), rgb(21, 93, 252).
Aa
White text reads best on this color (5.24:1).
About this color
#155DFC is a medium-dark, vivid blue. In OKLCH its lightness is 55%, its chroma 0.246 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Bright Blue (#0165FC), ΔE 0.017 away. White text reads best on it, at 5.24:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.246) |
| Temperature | cool |
| Nearest name | Bright Blue (#0165FC) |
| Black text | 4.00:1 |
| White text | 5.24:1 |
Values
| HEX | #155DFC |
| RGB | rgb(21, 93, 252) |
| HSL | hsl(221, 97%, 54%) |
| OKLCH | oklch(54.7% 0.246 262.9) |
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 #155DFC | 5.24:1 | AA | Lc -80.4 | Fine for body text |
| Black text on #155DFC | 4.00:1 | AA large text | Lc 29.1 | Dividers and decoration only |
| #155DFC text on white | 5.24:1 | AA | Lc 75.0 | Fine for body text |
| #155DFC text on black | 4.00:1 | AA large text | Lc -26.7 | 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
#F1F6FF
oklch(97.2% 0.013 262.4)
-
Step 100
100
#DFEAFF
oklch(93.5% 0.031 263.5)
-
Step 200
200
#C6DAFF
oklch(88.5% 0.056 262.8)
-
Step 300
300
#A0C1FF
oklch(80.9% 0.095 262.7)
-
Step 400
400
#6D9EFF
oklch(70.8% 0.152 262.8)
-
Step 500
500
#4581FF
oklch(63.1% 0.198 262.9)
-
Step 600
600 (this color)
#155DFC
oklch(54.7% 0.246 262.9)
-
Step 700
700
#0B4EDF
oklch(49.1% 0.228 262.8)
-
Step 800
800
#0D41B4
oklch(42.7% 0.189 262.9)
-
Step 900
900
#13398E
oklch(37.6% 0.148 263.1)
-
Step 950
950
#0C2353
oklch(27.1% 0.092 262.6)
#155DFC 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) | #0077FF | 0.059 |
| Deuteranopia (no green cones) | #0062F9 | 0.012 |
| Tritanopia (no blue cones) | #0088A4 | 0.188 |
| Achromatopsia (no color) | #6C6C6C | 0.246 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #155DFC
#155DFC
oklch(54.7% 0.246 262.9)
- #906900
#906900
oklch(54.6% 0.112 82.9)
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 #155DFC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Bright Blue #0165FC ΔE 0.017
- Azul #1D5DEC ΔE 0.024
- Electric Blue #0652FF ΔE 0.024
- Neon Blue #4361EE ΔE 0.041
- Cerulean Blue #056EEE ΔE 0.044
- Royal Blue #4169E1 ΔE 0.060
- Warm Blue #4B57DB ΔE 0.065
- Clear Blue #247AFD ΔE 0.070
Use #155DFC 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.