#217D8B
Closest named color: Ocean (#017B92). oklch(54.4% 0.085 210), rgb(33, 125, 139).
Aa
White text reads best on this color (4.80:1).
About this color
#217D8B is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 54%, its chroma 0.085 and its hue 210°. Its hue sits on the cool side of the wheel. The nearest named color is Ocean (#017B92), ΔE 0.017 away. White text reads best on it, at 4.80:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.085) |
| Temperature | cool |
| Nearest name | Ocean (#017B92) |
| Black text | 4.37:1 |
| White text | 4.80:1 |
Values
| HEX | #217D8B |
| RGB | rgb(33, 125, 139) |
| HSL | hsl(188, 62%, 34%) |
| OKLCH | oklch(54.4% 0.085 210) |
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 #217D8B | 4.80:1 | AA | Lc -78.4 | Fine for body text |
| Black text on #217D8B | 4.37:1 | AA large text | Lc 31.1 | Non-text elements, placeholder text |
| #217D8B text on white | 4.80:1 | AA | Lc 73.0 | Content text, not long reading |
| #217D8B text on black | 4.37:1 | AA large text | Lc -28.7 | 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
#F2F6F7
oklch(97% 0.004 214.3)
-
Step 100
100
#E2ECEE
oklch(93.6% 0.011 211)
-
Step 200
200
#CADDE1
oklch(88.5% 0.021 211.8)
-
Step 300
300
#A5C8CE
oklch(80.9% 0.038 209.1)
-
Step 400
400
#73ABB6
oklch(70.6% 0.061 211.2)
-
Step 500
500
#4A96A3
oklch(63% 0.077 210.1)
-
Step 600
600 (this color)
#217D8B
oklch(54.4% 0.085 210)
-
Step 700
700
#166D79
oklch(49.2% 0.079 209.1)
-
Step 800
800
#175963
oklch(42.9% 0.065 209.7)
-
Step 900
900
#1B4950
oklch(37.7% 0.051 208.9)
-
Step 950
950
#112B2F
oklch(27% 0.033 208.6)
#217D8B 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) | #71788C | 0.080 |
| Deuteranopia (no green cones) | #626D8B | 0.073 |
| Tritanopia (no blue cones) | #008381 | 0.029 |
| Achromatopsia (no color) | #727272 | 0.085 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #217D8B
#217D8B
oklch(54.4% 0.085 210)
- #9B5C52
#9B5C52
oklch(54.3% 0.085 29.8)
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 #217D8B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Ocean #017B92 ΔE 0.017
- Teal #008080 ΔE 0.025
- Deep Aqua #08787F ΔE 0.025
- Bluegreen #017A79 ΔE 0.032
- Sea Blue #047495 ΔE 0.038
- Teal Blue #01889F ΔE 0.038
- Dark Cyan #008B8B ΔE 0.043
- Cerulean #457B9D ΔE 0.043
Use #217D8B 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.