#155DC7
Closest named color: Mid Blue (#276AB3). oklch(50.1% 0.179 259.2), rgb(21, 93, 199).
Aa
White text reads best on this color (6.13:1).
About this color
#155DC7 is a medium-dark, vivid blue. In OKLCH its lightness is 50%, its chroma 0.179 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.052 away. White text reads best on it, at 6.13:1.
| Hue family | Blues |
| Lightness | medium-dark (50%) |
| Chroma | vivid (0.179) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.42:1 |
| White text | 6.13:1 |
Values
| HEX | #155DC7 |
| RGB | rgb(21, 93, 199) |
| HSL | hsl(216, 81%, 43%) |
| OKLCH | oklch(50.1% 0.179 259.2) |
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 #155DC7 | 6.13:1 | AA | Lc -85.1 | Fine for body text |
| Black text on #155DC7 | 3.42:1 | AA large text | Lc 24.1 | Dividers and decoration only |
| #155DC7 text on white | 6.13:1 | AA | Lc 79.9 | Fine for body text |
| #155DC7 text on black | 3.42:1 | AA large text | Lc -21.9 | 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 700.
-
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
#C7DBFA
oklch(88.6% 0.048 259.1)
-
Step 300
300
#9FC2F9
oklch(80.8% 0.087 259.3)
-
Step 400
400
#6AA1F6
oklch(70.8% 0.138 258.8)
-
Step 500
500
#4186F2
oklch(63.1% 0.177 259.2)
-
Step 600
600
#1F6DE1
oklch(55.7% 0.192 259.1)
-
Step 700
700 (this color)
#155DC7
oklch(50.1% 0.179 259.2)
-
Step 800
800
#124A9E
oklch(42.7% 0.148 259.2)
-
Step 900
900
#173F7E
oklch(37.8% 0.116 259.4)
-
Step 950
950
#0E2549
oklch(26.8% 0.073 259.1)
#155DC7 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) | #006ACB | 0.033 |
| Deuteranopia (no green cones) | #005AC5 | 0.012 |
| Tritanopia (no blue cones) | #007789 | 0.135 |
| Achromatopsia (no color) | #626262 | 0.179 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #155DC7
#155DC7
oklch(50.1% 0.179 259.2)
- #835B00
#835B00
oklch(50.1% 0.104 78.9)
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 #155DC7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.052
- Warm Blue #4B57DB ΔE 0.057
- Azul #1D5DEC ΔE 0.058
- Blue Blue #2242C7 ΔE 0.062
- Royal Blue #4169E1 ΔE 0.064
- French Blue #436BAD ΔE 0.071
- Cerulean Blue #056EEE ΔE 0.071
- Neon Blue #4361EE ΔE 0.073
Use #155DC7 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.