#217CD5
Closest named color: Windows Blue (#3778BF). oklch(58.1% 0.159 252.4), rgb(33, 124, 213).
Aa
Black text reads best on this color (4.90:1).
About this color
#217CD5 is a medium-dark, vivid blue. In OKLCH its lightness is 58%, its chroma 0.159 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.034 away. Black text reads best on it, at 4.90:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | vivid (0.159) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.90:1 |
| White text | 4.27:1 |
Values
| HEX | #217CD5 |
| RGB | rgb(33, 124, 213) |
| HSL | hsl(210, 73%, 48%) |
| OKLCH | oklch(58.1% 0.159 252.4) |
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 #217CD5 | 4.27:1 | AA large text | Lc -74.6 | Content text, not long reading |
| Black text on #217CD5 | 4.90:1 | AA | Lc 35.0 | Non-text elements, placeholder text |
| #217CD5 text on white | 4.27:1 | AA large text | Lc 69.1 | Content text, not long reading |
| #217CD5 text on black | 4.90:1 | AA | Lc -32.6 | 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
#E0EBF8
oklch(93.6% 0.021 252.5)
-
Step 200
200
#C7DBF3
oklch(88.4% 0.04 253)
-
Step 300
300
#A0C4EE
oklch(80.9% 0.071 252.6)
-
Step 400
400
#6AA4E6
oklch(70.6% 0.115 252.6)
-
Step 500
500
#3E8CDF
oklch(63.1% 0.147 252.4)
-
Step 600
600 (this color)
#217CD5
oklch(58.1% 0.159 252.4)
-
Step 700
700
#0261B1
oklch(49.1% 0.148 252.4)
-
Step 800
800
#0B508F
oklch(42.8% 0.122 252.1)
-
Step 900
900
#144372
oklch(37.8% 0.095 251.9)
-
Step 950
950
#0E2743
oklch(26.9% 0.061 253.2)
#217CD5 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) | #4F83D8 | 0.042 |
| Deuteranopia (no green cones) | #2E73D3 | 0.023 |
| Tritanopia (no blue cones) | #00919E | 0.117 |
| Achromatopsia (no color) | #7A7A7A | 0.159 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #217CD5
#217CD5
oklch(58.1% 0.159 252.4)
- #A76D00
#A76D00
oklch(58.2% 0.124 72.6)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes and gradients that use #217CD5
These curated palettes and gradients contain exactly #217CD5. Open one to see the full color scheme around it.
Palettes
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.034
- Water Blue #0E87CC ΔE 0.036
- Royal Blue #4169E1 ΔE 0.056
- Cerulean Blue #056EEE ΔE 0.057
- Nice Blue #107AB0 ΔE 0.059
- Dark Sky Blue #448EE4 ΔE 0.060
- Cool Blue #4984B8 ΔE 0.061
- Clear Blue #247AFD ΔE 0.062
Use #217CD5 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.