#1781DD
Closest named color: Water Blue (#0E87CC). oklch(59.6% 0.165 251.2), rgb(23, 129, 221).
Aa
Black text reads best on this color (5.22:1).
About this color
#1781DD is a medium-dark, vivid blue. In OKLCH its lightness is 60%, its chroma 0.165 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.034 away. Black text reads best on it, at 5.22:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | vivid (0.165) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.22:1 |
| White text | 4.02:1 |
Values
| HEX | #1781DD |
| RGB | rgb(23, 129, 221) |
| HSL | hsl(208, 81%, 48%) |
| OKLCH | oklch(59.6% 0.165 251.2) |
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 #1781DD | 4.02:1 | AA large text | Lc -72.4 | Content text, not long reading |
| Black text on #1781DD | 5.22:1 | AA | Lc 37.2 | Non-text elements, placeholder text |
| #1781DD text on white | 4.02:1 | AA large text | Lc 66.9 | Content text, not long reading |
| #1781DD text on black | 5.22:1 | AA | Lc -34.8 | 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 500.
-
Step 50
50
#F0F6FD
oklch(97.1% 0.011 252.1)
-
Step 100
100
#DFEBF9
oklch(93.5% 0.023 252.2)
-
Step 200
200
#C4DCF7
oklch(88.5% 0.045 251.4)
-
Step 300
300
#9AC5F4
oklch(81% 0.081 251.1)
-
Step 400
400
#5FA5EE
oklch(70.7% 0.129 251)
-
Step 500
500 (this color)
#1781DD
oklch(59.6% 0.165 251.2)
-
Step 600
600
#0075CE
oklch(55.7% 0.162 251.1)
-
Step 700
700
#0062AE
oklch(49.1% 0.143 251.1)
-
Step 800
800
#005090
oklch(42.7% 0.125 251.1)
-
Step 900
900
#034278
oklch(37.6% 0.108 251.5)
-
Step 950
950
#072746
oklch(26.9% 0.068 251.4)
#1781DD 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) | #5288E1 | 0.047 |
| Deuteranopia (no green cones) | #2E77DB | 0.026 |
| Tritanopia (no blue cones) | #0097A4 | 0.121 |
| Achromatopsia (no color) | #7F7F7F | 0.165 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1781DD
#1781DD
oklch(59.6% 0.165 251.2)
- #AE7000
#AE7000
oklch(59.7% 0.128 71.3)
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 #1781DD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.034
- Dark Sky Blue #448EE4 ΔE 0.048
- Windows Blue #3778BF ΔE 0.048
- Clear Blue #247AFD ΔE 0.054
- Cerulean Blue #056EEE ΔE 0.059
- Dodger Blue #1E90FF ΔE 0.061
- Royal Blue #4169E1 ΔE 0.063
- Cool Blue #4984B8 ΔE 0.065
Use #1781DD 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.