#197AD0
Closest named color: Windows Blue (#3778BF). oklch(57.2% 0.156 251.2), rgb(25, 122, 208).
Aa
Black text reads best on this color (4.73:1).
About this color
#197AD0 is a medium-dark, vivid blue. In OKLCH its lightness is 57%, its chroma 0.156 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.029 away. Black text reads best on it, at 4.73:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | vivid (0.156) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.73:1 |
| White text | 4.43:1 |
Values
| HEX | #197AD0 |
| RGB | rgb(25, 122, 208) |
| HSL | hsl(208, 79%, 46%) |
| OKLCH | oklch(57.2% 0.156 251.2) |
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 #197AD0 | 4.43:1 | AA large text | Lc -75.7 | Fine for body text |
| Black text on #197AD0 | 4.73:1 | AA | Lc 33.9 | Non-text elements, placeholder text |
| #197AD0 text on white | 4.43:1 | AA large text | Lc 70.2 | Content text, not long reading |
| #197AD0 text on black | 4.73:1 | AA | Lc -31.5 | 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
#C7DCF3
oklch(88.6% 0.039 250.7)
-
Step 300
300
#9FC4ED
oklch(80.8% 0.071 251.3)
-
Step 400
400
#69A5E5
oklch(70.7% 0.113 251.2)
-
Step 500
500
#3D8DDD
oklch(63.2% 0.144 251.2)
-
Step 600
600 (this color)
#197AD0
oklch(57.2% 0.156 251.2)
-
Step 700
700
#0062AE
oklch(49.1% 0.143 251.1)
-
Step 800
800
#07508E
oklch(42.7% 0.121 251.3)
-
Step 900
900
#134371
oklch(37.7% 0.094 251.1)
-
Step 950
950
#0D2842
oklch(27.1% 0.059 250.2)
#197AD0 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) | #4E80D3 | 0.043 |
| Deuteranopia (no green cones) | #2E70CE | 0.027 |
| Tritanopia (no blue cones) | #008F9B | 0.115 |
| Achromatopsia (no color) | #787878 | 0.156 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #197AD0
#197AD0
oklch(57.2% 0.156 251.2)
- #A46900
#A46900
oklch(57.1% 0.123 71.1)
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 #197AD0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.029
- Water Blue #0E87CC ΔE 0.038
- Nice Blue #107AB0 ΔE 0.051
- Royal Blue #4169E1 ΔE 0.057
- Mid Blue #276AB3 ΔE 0.057
- Cerulean Blue #056EEE ΔE 0.059
- Steel Blue #4682B4 ΔE 0.060
- Cool Blue #4984B8 ΔE 0.061
Use #197AD0 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.