#1977BF
Closest named color: Windows Blue (#3778BF). oklch(55.5% 0.139 247.8), rgb(25, 119, 191).
Aa
White text reads best on this color (4.73:1).
About this color
#1977BF is a medium-dark, moderately saturated blue. In OKLCH its lightness is 55%, its chroma 0.139 and its hue 248°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.018 away. White text reads best on it, at 4.73:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.139) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.43:1 |
| White text | 4.73:1 |
Values
| HEX | #1977BF |
| RGB | rgb(25, 119, 191) |
| HSL | hsl(206, 77%, 42%) |
| OKLCH | oklch(55.5% 0.139 247.8) |
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 #1977BF | 4.73:1 | AA | Lc -77.8 | Fine for body text |
| Black text on #1977BF | 4.43:1 | AA large text | Lc 31.7 | Non-text elements, placeholder text |
| #1977BF text on white | 4.73:1 | AA | Lc 72.4 | Content text, not long reading |
| #1977BF text on black | 4.43:1 | AA large text | Lc -29.3 | 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
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E1EBF6
oklch(93.6% 0.018 250.6)
-
Step 200
200
#C8DCEF
oklch(88.5% 0.034 246.8)
-
Step 300
300
#A1C5E8
oklch(80.9% 0.063 247.9)
-
Step 400
400
#6CA6DC
oklch(70.7% 0.1 247.7)
-
Step 500
500
#418FD2
oklch(63.2% 0.127 247.4)
-
Step 600
600 (this color)
#1977BF
oklch(55.5% 0.139 247.8)
-
Step 700
700
#0764A5
oklch(49.1% 0.129 247.8)
-
Step 800
800
#0E5286
oklch(42.7% 0.107 247.8)
-
Step 900
900
#16446B
oklch(37.6% 0.083 247.9)
-
Step 950
950
#0F283F
oklch(27% 0.053 248.7)
#1977BF 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) | #547BC2 | 0.049 |
| Deuteranopia (no green cones) | #3B6DBE | 0.031 |
| Tritanopia (no blue cones) | #008892 | 0.098 |
| Achromatopsia (no color) | #737373 | 0.139 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1977BF
#1977BF
oklch(55.5% 0.139 247.8)
- #A16300
#A16300
oklch(55.5% 0.122 67.9)
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 #1977BF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.018
- Nice Blue #107AB0 ΔE 0.027
- Mid Blue #276AB3 ΔE 0.037
- Flat Blue #3C73A8 ΔE 0.039
- French Blue #436BAD ΔE 0.044
- Water Blue #0E87CC ΔE 0.046
- Muted Blue #3B719F ΔE 0.051
- Steel Blue #4682B4 ΔE 0.052
Use #1977BF 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.