#2870C8
Closest named color: Windows Blue (#3778BF). oklch(54.8% 0.154 255.7), rgb(40, 112, 200).
Aa
White text reads best on this color (4.95:1).
About this color
#2870C8 is a medium-dark, vivid blue. In OKLCH its lightness is 55%, its chroma 0.154 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.031 away. White text reads best on it, at 4.95:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.154) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.24:1 |
| White text | 4.95:1 |
Values
| HEX | #2870C8 |
| RGB | rgb(40, 112, 200) |
| HSL | hsl(213, 67%, 47%) |
| OKLCH | oklch(54.8% 0.154 255.7) |
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 #2870C8 | 4.95:1 | AA | Lc -79.2 | Fine for body text |
| Black text on #2870C8 | 4.24:1 | AA large text | Lc 30.3 | Non-text elements, placeholder text |
| #2870C8 text on white | 4.95:1 | AA | Lc 73.8 | Content text, not long reading |
| #2870C8 text on black | 4.24:1 | AA large text | Lc -27.9 | 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 600.
-
Step 50
50
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E1EBF7
oklch(93.6% 0.019 252.9)
-
Step 200
200
#C9DBF3
oklch(88.5% 0.038 255.6)
-
Step 300
300
#A3C3ED
oklch(80.8% 0.069 255.4)
-
Step 400
400
#71A3E5
oklch(70.7% 0.111 255.7)
-
Step 500
500
#4A8ADD
oklch(63% 0.142 255.8)
-
Step 600
600 (this color)
#2870C8
oklch(54.8% 0.154 255.7)
-
Step 700
700
#1D60AF
oklch(49.2% 0.142 255.4)
-
Step 800
800
#1B4E8E
oklch(42.6% 0.119 256)
-
Step 900
900
#1C4271
oklch(37.7% 0.092 255.2)
-
Step 950
950
#112742
oklch(27% 0.058 254.7)
#2870C8 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) | #4378CB | 0.033 |
| Deuteranopia (no green cones) | #2169C6 | 0.020 |
| Tritanopia (no blue cones) | #008592 | 0.117 |
| Achromatopsia (no color) | #707070 | 0.154 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2870C8
#2870C8
oklch(54.8% 0.154 255.7)
- #976600
#976600
oklch(54.8% 0.115 75.9)
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 #2870C8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.031
- Mid Blue #276AB3 ΔE 0.035
- French Blue #436BAD ΔE 0.045
- Royal Blue #4169E1 ΔE 0.048
- Nice Blue #107AB0 ΔE 0.052
- Flat Blue #3C73A8 ΔE 0.054
- Cerulean Blue #056EEE ΔE 0.060
- Water Blue #0E87CC ΔE 0.062
Use #2870C8 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.