#2170C7
Closest named color: Windows Blue (#3778BF). oklch(54.5% 0.154 254.3), rgb(33, 112, 199).
Aa
White text reads best on this color (4.99:1).
About this color
#2170C7 is a medium-dark, vivid blue. In OKLCH its lightness is 55%, its chroma 0.154 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.032 away. White text reads best on it, at 4.99:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.154) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.20:1 |
| White text | 4.99:1 |
Values
| HEX | #2170C7 |
| RGB | rgb(33, 112, 199) |
| HSL | hsl(211, 72%, 45%) |
| OKLCH | oklch(54.5% 0.154 254.3) |
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 #2170C7 | 4.99:1 | AA | Lc -79.4 | Fine for body text |
| Black text on #2170C7 | 4.20:1 | AA large text | Lc 30.0 | Non-text elements, placeholder text |
| #2170C7 text on white | 4.99:1 | AA | Lc 74.0 | Content text, not long reading |
| #2170C7 text on black | 4.20:1 | AA large text | Lc -27.7 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E1EBF7
oklch(93.6% 0.019 252.9)
-
Step 200
200
#C8DBF3
oklch(88.5% 0.039 254.3)
-
Step 300
300
#A2C4ED
oklch(81% 0.069 253.4)
-
Step 400
400
#6FA4E5
oklch(70.8% 0.111 254.2)
-
Step 500
500
#478BDD
oklch(63.1% 0.142 254.5)
-
Step 600
600 (this color)
#2170C7
oklch(54.5% 0.154 254.3)
-
Step 700
700
#1760AF
oklch(49% 0.143 254.4)
-
Step 800
800
#164F8E
oklch(42.7% 0.119 254.3)
-
Step 900
900
#1A4271
oklch(37.7% 0.092 254.4)
-
Step 950
950
#102742
oklch(27% 0.058 253.9)
#2170C7 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) | #4377CA | 0.035 |
| Deuteranopia (no green cones) | #2169C5 | 0.019 |
| Tritanopia (no blue cones) | #008592 | 0.115 |
| Achromatopsia (no color) | #6F6F6F | 0.154 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2170C7
#2170C7
oklch(54.5% 0.154 254.3)
- #976400
#976400
oklch(54.4% 0.115 74.2)
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 #2170C7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.032
- Mid Blue #276AB3 ΔE 0.033
- French Blue #436BAD ΔE 0.045
- Nice Blue #107AB0 ΔE 0.050
- Royal Blue #4169E1 ΔE 0.051
- Flat Blue #3C73A8 ΔE 0.054
- Cerulean Blue #056EEE ΔE 0.061
- Water Blue #0E87CC ΔE 0.062
Use #2170C7 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.