#2177CC
Closest named color: Windows Blue (#3778BF). oklch(56.4% 0.153 252.5), rgb(33, 119, 204).
Aa
White text reads best on this color (4.58:1).
About this color
#2177CC is a medium-dark, vivid blue. In OKLCH its lightness is 56%, its chroma 0.153 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.024 away. White text reads best on it, at 4.58:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.153) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.57:1 |
| White text | 4.58:1 |
Values
| HEX | #2177CC |
| RGB | rgb(33, 119, 204) |
| HSL | hsl(210, 72%, 46%) |
| OKLCH | oklch(56.4% 0.153 252.5) |
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 #2177CC | 4.58:1 | AA | Lc -76.9 | Fine for body text |
| Black text on #2177CC | 4.57:1 | AA | Lc 32.7 | Non-text elements, placeholder text |
| #2177CC text on white | 4.58:1 | AA | Lc 71.4 | Content text, not long reading |
| #2177CC text on black | 4.57:1 | AA | Lc -30.3 | Non-text elements, placeholder text |
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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E1EBF7
oklch(93.6% 0.019 252.9)
-
Step 200
200
#C8DBF2
oklch(88.4% 0.038 253.2)
-
Step 300
300
#A1C4ED
oklch(80.9% 0.069 252.7)
-
Step 400
400
#6DA4E3
oklch(70.6% 0.11 252.7)
-
Step 500
500
#438CDC
oklch(63.1% 0.141 252.8)
-
Step 600
600 (this color)
#2177CC
oklch(56.4% 0.153 252.5)
-
Step 700
700
#0D61AE
oklch(49% 0.143 252.6)
-
Step 800
800
#11508D
oklch(42.8% 0.118 252.4)
-
Step 900
900
#174371
oklch(37.8% 0.092 252.4)
-
Step 950
950
#0F2742
oklch(26.9% 0.059 253.1)
#2177CC 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) | #4C7DCF | 0.039 |
| Deuteranopia (no green cones) | #2D6ECA | 0.024 |
| Tritanopia (no blue cones) | #008B97 | 0.113 |
| Achromatopsia (no color) | #757575 | 0.153 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2177CC
#2177CC
oklch(56.4% 0.153 252.5)
- #A06800
#A06800
oklch(56.4% 0.12 72.4)
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 #2177CC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.024
- Water Blue #0E87CC ΔE 0.044
- Nice Blue #107AB0 ΔE 0.047
- Mid Blue #276AB3 ΔE 0.048
- Royal Blue #4169E1 ΔE 0.054
- French Blue #436BAD ΔE 0.055
- Flat Blue #3C73A8 ΔE 0.056
- Cerulean Blue #056EEE ΔE 0.060
Use #2177CC 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.