#155BDA
Closest named color: Azul (#1D5DEC). oklch(51.3% 0.206 261.4), rgb(21, 91, 218).
Aa
White text reads best on this color (5.93:1).
About this color
#155BDA is a medium-dark, vivid blue. In OKLCH its lightness is 51%, its chroma 0.206 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Azul (#1D5DEC), ΔE 0.029 away. White text reads best on it, at 5.93:1.
| Hue family | Blues |
| Lightness | medium-dark (51%) |
| Chroma | vivid (0.206) |
| Temperature | cool |
| Nearest name | Azul (#1D5DEC) |
| Black text | 3.54:1 |
| White text | 5.93:1 |
Values
| HEX | #155BDA |
| RGB | rgb(21, 91, 218) |
| HSL | hsl(219, 82%, 47%) |
| OKLCH | oklch(51.3% 0.206 261.4) |
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 #155BDA | 5.93:1 | AA | Lc -84.1 | Fine for body text |
| Black text on #155BDA | 3.54:1 | AA large text | Lc 25.2 | Dividers and decoration only |
| #155BDA text on white | 5.93:1 | AA | Lc 78.8 | Fine for body text |
| #155BDA text on black | 3.54:1 | AA large text | Lc -23.0 | 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 700.
-
Step 50
50
#F1F6FF
oklch(97.2% 0.013 262.4)
-
Step 100
100
#DFEBFE
oklch(93.7% 0.029 259.6)
-
Step 200
200
#C5DAFF
oklch(88.5% 0.056 261.8)
-
Step 300
300
#9EC1FF
oklch(80.8% 0.096 261.6)
-
Step 400
400
#699FFF
oklch(70.8% 0.152 261.1)
-
Step 500
500
#3F82FF
oklch(63.1% 0.198 261.5)
-
Step 600
600
#1A66F2
oklch(55.5% 0.222 261.5)
-
Step 700
700 (this color)
#155BDA
oklch(51.3% 0.206 261.4)
-
Step 800
800
#0E46AA
oklch(42.8% 0.17 261.3)
-
Step 900
900
#143C87
oklch(37.7% 0.134 261.5)
-
Step 950
950
#0D244F
oklch(27% 0.084 261.5)
#155BDA 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) | #006DDE | 0.044 |
| Deuteranopia (no green cones) | #005BD8 | 0.007 |
| Tritanopia (no blue cones) | #007C92 | 0.157 |
| Achromatopsia (no color) | #646464 | 0.206 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #155BDA
#155BDA
oklch(51.3% 0.206 261.4)
- #855F00
#855F00
oklch(51.2% 0.106 81.3)
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 #155BDA, closest first.
No curated palette has a color within ΔE 0.04 of #155BDA.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Azul #1D5DEC ΔE 0.029
- Warm Blue #4B57DB ΔE 0.045
- Neon Blue #4361EE ΔE 0.052
- Royal Blue #4169E1 ΔE 0.053
- Cerulean Blue #056EEE ΔE 0.054
- Bright Blue #0165FC ΔE 0.056
- Electric Blue #0652FF ΔE 0.059
- Blue Blue #2242C7 ΔE 0.063
Use #155BDA 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.