#197DBD
Closest named color: Windows Blue (#3778BF). oklch(56.8% 0.13 243.7), rgb(25, 125, 189).
Aa
Black text reads best on this color (4.70:1).
About this color
#197DBD is a medium-dark, moderately saturated blue. In OKLCH its lightness is 57%, its chroma 0.130 and its hue 244°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.021 away. Black text reads best on it, at 4.70:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.130) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.70:1 |
| White text | 4.45:1 |
Values
| HEX | #197DBD |
| RGB | rgb(25, 125, 189) |
| HSL | hsl(203, 77%, 42%) |
| OKLCH | oklch(56.8% 0.13 243.7) |
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 #197DBD | 4.45:1 | AA large text | Lc -75.9 | Fine for body text |
| Black text on #197DBD | 4.70:1 | AA | Lc 33.6 | Non-text elements, placeholder text |
| #197DBD text on white | 4.45:1 | AA large text | Lc 70.5 | Content text, not long reading |
| #197DBD text on black | 4.70:1 | 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
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#E1EBF5
oklch(93.5% 0.017 248)
-
Step 200
200
#C8DCEE
oklch(88.5% 0.033 245.3)
-
Step 300
300
#A1C6E4
oklch(81% 0.058 243)
-
Step 400
400
#6BA7D7
oklch(70.6% 0.094 243.8)
-
Step 500
500
#3F90CC
oklch(63% 0.12 243.9)
-
Step 600
600 (this color)
#197DBD
oklch(56.8% 0.13 243.7)
-
Step 700
700
#00669F
oklch(49.1% 0.12 243.6)
-
Step 800
800
#095381
oklch(42.6% 0.1 243.9)
-
Step 900
900
#144568
oklch(37.6% 0.079 244.1)
-
Step 950
950
#0E293D
oklch(27.1% 0.05 243.6)
#197DBD 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) | #5E7FC0 | 0.056 |
| Deuteranopia (no green cones) | #4871BC | 0.042 |
| Tritanopia (no blue cones) | #008D94 | 0.090 |
| Achromatopsia (no color) | #777777 | 0.130 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #197DBD
#197DBD
oklch(56.8% 0.13 243.7)
- #AA6300
#AA6300
oklch(56.7% 0.129 63.7)
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 #197DBD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.021
- Nice Blue #107AB0 ΔE 0.022
- Water Blue #0E87CC ΔE 0.033
- Steel Blue #4682B4 ΔE 0.037
- Flat Blue #3C73A8 ΔE 0.040
- Cool Blue #4984B8 ΔE 0.041
- Blue NCS #118AB2 ΔE 0.045
- Muted Blue #3B719F ΔE 0.052
Use #197DBD 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.