#155FB2
Closest named color: Mid Blue (#276AB3). oklch(49% 0.149 255.2), rgb(21, 95, 178).
Aa
White text reads best on this color (6.34:1).
About this color
#155FB2 is a medium-dark, vivid blue. In OKLCH its lightness is 49%, its chroma 0.149 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.034 away. White text reads best on it, at 6.34:1.
| Hue family | Blues |
| Lightness | medium-dark (49%) |
| Chroma | vivid (0.149) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.31:1 |
| White text | 6.34:1 |
Values
| HEX | #155FB2 |
| RGB | rgb(21, 95, 178) |
| HSL | hsl(212, 79%, 39%) |
| OKLCH | oklch(49% 0.149 255.2) |
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 #155FB2 | 6.34:1 | AA | Lc -86.1 | Fine for body text |
| Black text on #155FB2 | 3.31:1 | AA large text | Lc 23.1 | Dividers and decoration only |
| #155FB2 text on white | 6.34:1 | AA | Lc 81.0 | Fine for body text |
| #155FB2 text on black | 3.31:1 | AA large text | Lc -20.9 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E1EBF8
oklch(93.6% 0.021 254.9)
-
Step 200
200
#C8DBF4
oklch(88.5% 0.04 255.3)
-
Step 300
300
#A2C3EF
oklch(80.8% 0.072 255.7)
-
Step 400
400
#6EA3E7
oklch(70.6% 0.115 255.1)
-
Step 500
500
#468AE0
oklch(63% 0.147 255.5)
-
Step 600
600
#2472CE
oklch(55.5% 0.16 255.4)
-
Step 700
700 (this color)
#155FB2
oklch(49% 0.149 255.2)
-
Step 800
800
#164E90
oklch(42.6% 0.123 255.4)
-
Step 900
900
#194273
oklch(37.8% 0.096 254.8)
-
Step 950
950
#102743
oklch(27% 0.06 254.6)
#155FB2 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) | #3167B5 | 0.032 |
| Deuteranopia (no green cones) | #0059B0 | 0.019 |
| Tritanopia (no blue cones) | #007380 | 0.111 |
| Achromatopsia (no color) | #5F5F5F | 0.149 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #155FB2
#155FB2
oklch(49% 0.149 255.2)
- #825600
#825600
oklch(48.9% 0.103 74.7)
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 #155FB2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.034
- French Blue #436BAD ΔE 0.054
- Denim Blue #3B5B92 ΔE 0.056
- Peacock Blue #016795 ΔE 0.056
- Dusky Blue #475F94 ΔE 0.062
- Dusk Blue #26538D ΔE 0.064
- Light Navy Blue #2E5A88 ΔE 0.067
- Ocean Blue #03719C ΔE 0.068
Use #155FB2 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.