#1971CC
Closest named color: Windows Blue (#3778BF). oklch(54.9% 0.161 254), rgb(25, 113, 204).
Aa
White text reads best on this color (4.91:1).
About this color
#1971CC is a medium-dark, vivid blue. In OKLCH its lightness is 55%, its chroma 0.161 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.036 away. White text reads best on it, at 4.91:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.161) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.27:1 |
| White text | 4.91:1 |
Values
| HEX | #1971CC |
| RGB | rgb(25, 113, 204) |
| HSL | hsl(211, 78%, 45%) |
| OKLCH | oklch(54.9% 0.161 254) |
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 #1971CC | 4.91:1 | AA | Lc -78.9 | Fine for body text |
| Black text on #1971CC | 4.27:1 | AA large text | Lc 30.6 | Non-text elements, placeholder text |
| #1971CC text on white | 4.91:1 | AA | Lc 73.5 | Content text, not long reading |
| #1971CC text on black | 4.27:1 | AA large text | Lc -28.2 | 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
#E1EBF8
oklch(93.6% 0.021 254.9)
-
Step 200
200
#C7DBF4
oklch(88.4% 0.041 254)
-
Step 300
300
#A1C4EF
oklch(81% 0.072 253.8)
-
Step 400
400
#6CA4E7
oklch(70.8% 0.115 253.7)
-
Step 500
500
#418BE0
oklch(63% 0.148 253.8)
-
Step 600
600 (this color)
#1971CC
oklch(54.9% 0.161 254)
-
Step 700
700
#0B60B3
oklch(49.1% 0.151 254)
-
Step 800
800
#104F91
oklch(42.8% 0.125 254)
-
Step 900
900
#164273
oklch(37.7% 0.097 253.8)
-
Step 950
950
#0F2743
oklch(27% 0.06 253.9)
#1971CC 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) | #4079CF | 0.037 |
| Deuteranopia (no green cones) | #1669CA | 0.022 |
| Tritanopia (no blue cones) | #008794 | 0.121 |
| Achromatopsia (no color) | #717171 | 0.161 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1971CC
#1971CC
oklch(54.9% 0.161 254)
- #996500
#996500
oklch(54.9% 0.116 73.9)
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 #1971CC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.036
- Mid Blue #276AB3 ΔE 0.040
- Royal Blue #4169E1 ΔE 0.048
- French Blue #436BAD ΔE 0.053
- Cerulean Blue #056EEE ΔE 0.053
- Nice Blue #107AB0 ΔE 0.055
- Flat Blue #3C73A8 ΔE 0.061
- Water Blue #0E87CC ΔE 0.061
Use #1971CC 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.