#217DE0
Closest named color: Water Blue (#0E87CC). oklch(59.1% 0.172 254.3), rgb(33, 125, 224).
Aa
Black text reads best on this color (5.07:1).
About this color
#217DE0 is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.172 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.045 away. Black text reads best on it, at 5.07:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.172) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.07:1 |
| White text | 4.13:1 |
Values
| HEX | #217DE0 |
| RGB | rgb(33, 125, 224) |
| HSL | hsl(211, 75%, 50%) |
| OKLCH | oklch(59.1% 0.172 254.3) |
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 #217DE0 | 4.13:1 | AA large text | Lc -73.4 | Content text, not long reading |
| Black text on #217DE0 | 5.07:1 | AA | Lc 36.2 | Non-text elements, placeholder text |
| #217DE0 text on white | 4.13:1 | AA large text | Lc 67.9 | Content text, not long reading |
| #217DE0 text on black | 5.07:1 | AA | Lc -33.7 | 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
#E0EBF9
oklch(93.6% 0.022 254.4)
-
Step 200
200
#C6DBF6
oklch(88.4% 0.044 254.8)
-
Step 300
300
#9FC4F2
oklch(81% 0.077 254.1)
-
Step 400
400
#68A3EC
oklch(70.6% 0.124 254.5)
-
Step 500
500
#3C8AE6
oklch(63% 0.158 254.6)
-
Step 600
600 (this color)
#217DE0
oklch(59.1% 0.172 254.3)
-
Step 700
700
#005FB7
oklch(49.1% 0.158 254.4)
-
Step 800
800
#074E95
oklch(42.7% 0.133 254.4)
-
Step 900
900
#134276
oklch(37.8% 0.102 254)
-
Step 950
950
#0D2745
oklch(27% 0.064 254)
#217DE0 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) | #4886E4 | 0.039 |
| Deuteranopia (no green cones) | #1D75DE | 0.022 |
| Tritanopia (no blue cones) | #0095A3 | 0.129 |
| Achromatopsia (no color) | #7D7D7D | 0.172 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #217DE0
#217DE0
oklch(59.1% 0.172 254.3)
- #A97000
#A97000
oklch(59.1% 0.125 73.9)
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 #217DE0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.045
- Clear Blue #247AFD ΔE 0.045
- Cerulean Blue #056EEE ΔE 0.048
- Windows Blue #3778BF ΔE 0.050
- Royal Blue #4169E1 ΔE 0.052
- Dark Sky Blue #448EE4 ΔE 0.055
- Dodger Blue #1E90FF ΔE 0.064
- Soft Blue #6488EA ΔE 0.068
Use #217DE0 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.