#2781BF
Closest named color: Water Blue (#0E87CC). oklch(58.1% 0.126 243.9), rgb(39, 129, 191).
Aa
Black text reads best on this color (4.97:1).
About this color
#2781BF is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.126 and its hue 244°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.023 away. Black text reads best on it, at 4.97:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.126) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 4.97:1 |
| White text | 4.21:1 |
Values
| HEX | #2781BF |
| RGB | rgb(39, 129, 191) |
| HSL | hsl(204, 66%, 45%) |
| OKLCH | oklch(58.1% 0.126 243.9) |
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 #2781BF | 4.21:1 | AA large text | Lc -74.2 | Content text, not long reading |
| Black text on #2781BF | 4.97:1 | AA | Lc 35.4 | Non-text elements, placeholder text |
| #2781BF text on white | 4.21:1 | AA large text | Lc 68.7 | Content text, not long reading |
| #2781BF text on black | 4.97:1 | AA | Lc -33.0 | 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
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#E1EBF4
oklch(93.5% 0.016 245.1)
-
Step 200
200
#C8DCED
oklch(88.5% 0.032 243.7)
-
Step 300
300
#A2C5E3
oklch(80.8% 0.057 244.4)
-
Step 400
400
#6EA7D5
oklch(70.7% 0.09 243.9)
-
Step 500
500
#4390CA
oklch(63% 0.116 244)
-
Step 600
600 (this color)
#2781BF
oklch(58.1% 0.126 243.9)
-
Step 700
700
#0A669D
oklch(49.1% 0.116 243.5)
-
Step 800
800
#105380
oklch(42.6% 0.098 244.4)
-
Step 900
900
#174566
oklch(37.6% 0.075 243.7)
-
Step 950
950
#0F293C
oklch(27.1% 0.048 243)
#2781BF 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) | #6483C2 | 0.056 |
| Deuteranopia (no green cones) | #4F75BE | 0.042 |
| Tritanopia (no blue cones) | #009097 | 0.087 |
| Achromatopsia (no color) | #7B7B7B | 0.126 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2781BF
#2781BF
oklch(58.1% 0.126 243.9)
- #AD6812
#AD6812
oklch(58.1% 0.126 64.1)
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 #2781BF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.023
- Windows Blue #3778BF ΔE 0.026
- Steel Blue #4682B4 ΔE 0.028
- Cool Blue #4984B8 ΔE 0.029
- Nice Blue #107AB0 ΔE 0.032
- Blue NCS #118AB2 ΔE 0.037
- Flat Blue #3C73A8 ΔE 0.047
- Off Blue #5684AE ΔE 0.047
Use #2781BF 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.