#197ACC
Closest named color: Windows Blue (#3778BF). oklch(57% 0.151 250.2), rgb(25, 122, 204).
Aa
Black text reads best on this color (4.69:1).
About this color
#197ACC is a medium-dark, vivid blue. In OKLCH its lightness is 57%, its chroma 0.151 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.024 away. Black text reads best on it, at 4.69:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | vivid (0.151) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.69:1 |
| White text | 4.47:1 |
Values
| HEX | #197ACC |
| RGB | rgb(25, 122, 204) |
| HSL | hsl(207, 78%, 45%) |
| OKLCH | oklch(57% 0.151 250.2) |
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 #197ACC | 4.47:1 | AA large text | Lc -76.0 | Fine for body text |
| Black text on #197ACC | 4.69:1 | AA | Lc 33.6 | Non-text elements, placeholder text |
| #197ACC text on white | 4.47:1 | AA large text | Lc 70.5 | Content text, not long reading |
| #197ACC text on black | 4.69:1 | AA | Lc -31.2 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E0EBF7
oklch(93.5% 0.02 250.4)
-
Step 200
200
#C7DCF2
oklch(88.6% 0.038 249.5)
-
Step 300
300
#A0C5EC
oklch(81% 0.068 250)
-
Step 400
400
#6AA5E2
oklch(70.6% 0.109 250.4)
-
Step 500
500
#3D8DDA
oklch(63% 0.14 250.3)
-
Step 600
600 (this color)
#197ACC
oklch(57% 0.151 250.2)
-
Step 700
700
#0063AC
oklch(49.2% 0.139 250)
-
Step 800
800
#08518C
oklch(42.8% 0.117 250.1)
-
Step 900
900
#134370
oklch(37.6% 0.092 250.7)
-
Step 950
950
#0D2841
oklch(27% 0.057 249.3)
#197ACC 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) | #5180CF | 0.046 |
| Deuteranopia (no green cones) | #3370CA | 0.028 |
| Tritanopia (no blue cones) | #008E99 | 0.110 |
| Achromatopsia (no color) | #777777 | 0.151 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #197ACC
#197ACC
oklch(57% 0.151 250.2)
- #A46800
#A46800
oklch(56.9% 0.123 70.3)
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 #197ACC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.024
- Water Blue #0E87CC ΔE 0.036
- Nice Blue #107AB0 ΔE 0.045
- Mid Blue #276AB3 ΔE 0.053
- Steel Blue #4682B4 ΔE 0.056
- Flat Blue #3C73A8 ΔE 0.057
- Cool Blue #4984B8 ΔE 0.057
- French Blue #436BAD ΔE 0.059
Use #197ACC 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.