#177D99
Closest named color: Ocean (#017B92). oklch(54.8% 0.096 222.1), rgb(23, 125, 153).
Aa
White text reads best on this color (4.74:1).
About this color
#177D99 is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 55%, its chroma 0.096 and its hue 222°. Its hue sits on the cool side of the wheel. The nearest named color is Ocean (#017B92), ΔE 0.014 away. White text reads best on it, at 4.74:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.096) |
| Temperature | cool |
| Nearest name | Ocean (#017B92) |
| Black text | 4.42:1 |
| White text | 4.74:1 |
Values
| HEX | #177D99 |
| RGB | rgb(23, 125, 153) |
| HSL | hsl(193, 74%, 35%) |
| OKLCH | oklch(54.8% 0.096 222.1) |
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 #177D99 | 4.74:1 | AA | Lc -77.9 | Fine for body text |
| Black text on #177D99 | 4.42:1 | AA large text | Lc 31.6 | Non-text elements, placeholder text |
| #177D99 text on white | 4.74:1 | AA | Lc 72.5 | Content text, not long reading |
| #177D99 text on black | 4.42:1 | AA large text | Lc -29.2 | 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
#F1F6F8
oklch(97% 0.006 223.5)
-
Step 100
100
#E1ECF0
oklch(93.6% 0.013 221.4)
-
Step 200
200
#C9DDE5
oklch(88.5% 0.024 223.7)
-
Step 300
300
#A3C7D5
oklch(80.8% 0.043 223.5)
-
Step 400
400
#6FABC0
oklch(70.8% 0.069 222.1)
-
Step 500
500
#4495B0
oklch(63% 0.088 222.8)
-
Step 600
600 (this color)
#177D99
oklch(54.8% 0.096 222.1)
-
Step 700
700
#076B85
oklch(49% 0.089 222.7)
-
Step 800
800
#0F586C
oklch(42.8% 0.074 221.7)
-
Step 900
900
#174857
oklch(37.6% 0.057 221.9)
-
Step 950
950
#102A33
oklch(26.9% 0.036 223.3)
#177D99 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) | #6D7A9A | 0.077 |
| Deuteranopia (no green cones) | #5C6E99 | 0.067 |
| Tritanopia (no blue cones) | #008686 | 0.047 |
| Achromatopsia (no color) | #737373 | 0.096 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #177D99
#177D99
oklch(54.8% 0.096 222.1)
- #A05D43
#A05D43
oklch(54.9% 0.096 41.7)
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 #177D99, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Ocean #017B92 ΔE 0.014
- Sea Blue #047495 ΔE 0.028
- Teal Blue #01889F ΔE 0.032
- Cerulean #457B9D ΔE 0.032
- Ocean Blue #03719C ΔE 0.040
- Nice Blue #107AB0 ΔE 0.040
- Dull Blue #49759C ΔE 0.041
- Stormy Blue #507B9C ΔE 0.042
Use #177D99 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.