#17709B
Closest named color: Ocean Blue (#03719C). oklch(51.7% 0.103 236), rgb(23, 112, 155).
Aa
White text reads best on this color (5.48:1).
About this color
#17709B is a medium-dark, moderately saturated blue. In OKLCH its lightness is 52%, its chroma 0.103 and its hue 236°. Its hue sits on the cool side of the wheel. The nearest named color is Ocean Blue (#03719C), ΔE 0.006 away. White text reads best on it, at 5.48:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | moderately saturated (0.103) |
| Temperature | cool |
| Nearest name | Ocean Blue (#03719C) |
| Black text | 3.82:1 |
| White text | 5.48:1 |
Values
| HEX | #17709B |
| RGB | rgb(23, 112, 155) |
| HSL | hsl(200, 74%, 35%) |
| OKLCH | oklch(51.7% 0.103 236) |
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 #17709B | 5.48:1 | AA | Lc -82.3 | Fine for body text |
| Black text on #17709B | 3.82:1 | AA large text | Lc 27.1 | Dividers and decoration only |
| #17709B text on white | 5.48:1 | AA | Lc 77.0 | Fine for body text |
| #17709B text on black | 3.82:1 | AA large text | Lc -24.8 | 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 700.
-
Step 50
50
#F1F6F9
oklch(97% 0.007 233.6)
-
Step 100
100
#E1ECF2
oklch(93.7% 0.014 231.2)
-
Step 200
200
#C9DCE9
oklch(88.4% 0.027 237.6)
-
Step 300
300
#A2C6DD
oklch(80.8% 0.05 236.3)
-
Step 400
400
#6EA9CC
oklch(70.8% 0.08 235.6)
-
Step 500
500
#4393BF
oklch(63.2% 0.102 235.7)
-
Step 600
600
#1B7CAB
oklch(55.6% 0.111 236)
-
Step 700
700 (this color)
#17709B
oklch(51.7% 0.103 236)
-
Step 800
800
#0F5577
oklch(42.6% 0.085 236.2)
-
Step 900
900
#174760
oklch(37.8% 0.066 235.3)
-
Step 950
950
#0F2938
oklch(26.8% 0.042 236.6)
#17709B 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) | #5B709D | 0.060 |
| Deuteranopia (no green cones) | #4A649A | 0.049 |
| Tritanopia (no blue cones) | #007B7F | 0.064 |
| Achromatopsia (no color) | #696969 | 0.103 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #17709B
#17709B
oklch(51.7% 0.103 236)
- #945625
#945625
oklch(51.6% 0.103 55.8)
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 #17709B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Ocean Blue #03719C ΔE 0.006
- Sea Blue #047495 ΔE 0.018
- Muted Blue #3B719F ΔE 0.026
- Peacock Blue #016795 ΔE 0.029
- Flat Blue #3C73A8 ΔE 0.035
- Nice Blue #107AB0 ΔE 0.039
- Ocean #017B92 ΔE 0.040
- Denim #3B638C ΔE 0.043
Use #17709B 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.