#177DD4
Closest named color: Water Blue (#0E87CC). oklch(58.1% 0.159 250.7), rgb(23, 125, 212).
Aa
Black text reads best on this color (4.92:1).
About this color
#177DD4 is a medium-dark, vivid blue. In OKLCH its lightness is 58%, its chroma 0.159 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.032 away. Black text reads best on it, at 4.92:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | vivid (0.159) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 4.92:1 |
| White text | 4.26:1 |
Values
| HEX | #177DD4 |
| RGB | rgb(23, 125, 212) |
| HSL | hsl(208, 80%, 46%) |
| OKLCH | oklch(58.1% 0.159 250.7) |
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 #177DD4 | 4.26:1 | AA large text | Lc -74.4 | Content text, not long reading |
| Black text on #177DD4 | 4.92:1 | AA | Lc 35.2 | Non-text elements, placeholder text |
| #177DD4 text on white | 4.26:1 | AA large text | Lc 68.9 | Content text, not long reading |
| #177DD4 text on black | 4.92:1 | AA | Lc -32.7 | 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
#E0EBF8
oklch(93.6% 0.021 252.5)
-
Step 200
200
#C6DCF3
oklch(88.5% 0.04 249.5)
-
Step 300
300
#9FC5EE
oklch(81% 0.071 250.6)
-
Step 400
400
#68A5E5
oklch(70.7% 0.114 250.8)
-
Step 500
500
#398DDE
oklch(63.1% 0.146 250.7)
-
Step 600
600 (this color)
#177DD4
oklch(58.1% 0.159 250.7)
-
Step 700
700
#0062AD
oklch(49.1% 0.142 250.8)
-
Step 800
800
#02508F
oklch(42.7% 0.123 251.1)
-
Step 900
900
#114372
oklch(37.7% 0.096 251)
-
Step 950
950
#0C2843
oklch(27.1% 0.061 250.4)
#177DD4 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) | #5183D7 | 0.046 |
| Deuteranopia (no green cones) | #3073D2 | 0.027 |
| Tritanopia (no blue cones) | #00929E | 0.116 |
| Achromatopsia (no color) | #7A7A7A | 0.159 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #177DD4
#177DD4
oklch(58.1% 0.159 250.7)
- #A86B00
#A86B00
oklch(58% 0.125 70.6)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #177DD4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.032
- Windows Blue #3778BF ΔE 0.034
- Nice Blue #107AB0 ΔE 0.056
- Cerulean Blue #056EEE ΔE 0.059
- Royal Blue #4169E1 ΔE 0.060
- Cool Blue #4984B8 ΔE 0.060
- Dark Sky Blue #448EE4 ΔE 0.061
- Steel Blue #4682B4 ΔE 0.061
Use #177DD4 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.