#1780CF
Closest named color: Water Blue (#0E87CC). oklch(58.5% 0.149 248), rgb(23, 128, 207).
Aa
Black text reads best on this color (5.02:1).
About this color
#1780CF is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.149 and its hue 248°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.021 away. Black text reads best on it, at 5.02:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.149) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.02:1 |
| White text | 4.17:1 |
Values
| HEX | #1780CF |
| RGB | rgb(23, 128, 207) |
| HSL | hsl(206, 80%, 45%) |
| OKLCH | oklch(58.5% 0.149 248) |
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 #1780CF | 4.17:1 | AA large text | Lc -73.7 | Content text, not long reading |
| Black text on #1780CF | 5.02:1 | AA | Lc 35.8 | Non-text elements, placeholder text |
| #1780CF text on white | 4.17:1 | AA large text | Lc 68.2 | Content text, not long reading |
| #1780CF text on black | 5.02:1 | AA | Lc -33.4 | 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
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E0EBF7
oklch(93.5% 0.02 250.4)
-
Step 200
200
#C6DCF1
oklch(88.5% 0.037 247)
-
Step 300
300
#9FC5EB
oklch(80.9% 0.068 248.7)
-
Step 400
400
#68A6E0
oklch(70.7% 0.107 248)
-
Step 500
500
#398ED8
oklch(63% 0.138 248.3)
-
Step 600
600 (this color)
#1780CF
oklch(58.5% 0.149 248)
-
Step 700
700
#0064A7
oklch(49.1% 0.132 247.9)
-
Step 800
800
#00528A
oklch(42.8% 0.115 247.8)
-
Step 900
900
#10446E
oklch(37.6% 0.089 247.9)
-
Step 950
950
#0C2841
oklch(27% 0.058 248.6)
#1780CF 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) | #5984D2 | 0.051 |
| Deuteranopia (no green cones) | #3D75CD | 0.033 |
| Tritanopia (no blue cones) | #00939D | 0.107 |
| Achromatopsia (no color) | #7C7C7C | 0.149 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1780CF
#1780CF
oklch(58.5% 0.149 248)
- #AD6B00
#AD6B00
oklch(58.6% 0.129 68.1)
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 #1780CF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.021
- Windows Blue #3778BF ΔE 0.031
- Nice Blue #107AB0 ΔE 0.049
- Cool Blue #4984B8 ΔE 0.050
- Steel Blue #4682B4 ΔE 0.050
- Dark Sky Blue #448EE4 ΔE 0.058
- Blue NCS #118AB2 ΔE 0.059
- Flat Blue #3C73A8 ΔE 0.064
Use #1780CF 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.