#197AA4
Closest named color: Nice Blue (#107AB0). oklch(54.7% 0.106 233.2), rgb(25, 122, 164).
Aa
White text reads best on this color (4.81:1).
About this color
#197AA4 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 55%, its chroma 0.106 and its hue 233°. Its hue sits on the cool side of the wheel. The nearest named color is Nice Blue (#107AB0), ΔE 0.019 away. White text reads best on it, at 4.81:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.106) |
| Temperature | cool |
| Nearest name | Nice Blue (#107AB0) |
| Black text | 4.36:1 |
| White text | 4.81:1 |
Values
| HEX | #197AA4 |
| RGB | rgb(25, 122, 164) |
| HSL | hsl(198, 74%, 37%) |
| OKLCH | oklch(54.7% 0.106 233.2) |
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 #197AA4 | 4.81:1 | AA | Lc -78.4 | Fine for body text |
| Black text on #197AA4 | 4.36:1 | AA large text | Lc 31.1 | Non-text elements, placeholder text |
| #197AA4 text on white | 4.81:1 | AA | Lc 73.0 | Content text, not long reading |
| #197AA4 text on black | 4.36:1 | AA large text | Lc -28.7 | 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
#F1F6F9
oklch(97% 0.007 233.6)
-
Step 100
100
#E1ECF2
oklch(93.7% 0.014 231.2)
-
Step 200
200
#C9DDE8
oklch(88.6% 0.026 231.7)
-
Step 300
300
#A3C7DB
oklch(81% 0.048 232.5)
-
Step 400
400
#6FA9C9
oklch(70.7% 0.076 233.5)
-
Step 500
500
#4593BB
oklch(63.1% 0.097 233.6)
-
Step 600
600 (this color)
#197AA4
oklch(54.7% 0.106 233.2)
-
Step 700
700
#0C698F
oklch(49.1% 0.098 233.2)
-
Step 800
800
#115674
oklch(42.7% 0.081 232.8)
-
Step 900
900
#18475E
oklch(37.7% 0.064 233.4)
-
Step 950
950
#102A37
oklch(27.1% 0.04 232.6)
#197AA4 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) | #6579A6 | 0.067 |
| Deuteranopia (no green cones) | #536CA3 | 0.057 |
| Tritanopia (no blue cones) | #008588 | 0.064 |
| Achromatopsia (no color) | #727272 | 0.106 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #197AA4
#197AA4
oklch(54.7% 0.106 233.2)
- #A05E30
#A05E30
oklch(54.8% 0.105 53.4)
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 #197AA4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Nice Blue #107AB0 ΔE 0.019
- Sea Blue #047495 ΔE 0.029
- Ocean Blue #03719C ΔE 0.030
- Muted Blue #3B719F ΔE 0.030
- Flat Blue #3C73A8 ΔE 0.030
- Cerulean #457B9D ΔE 0.031
- Ocean #017B92 ΔE 0.031
- Dull Blue #49759C ΔE 0.035
Use #197AA4 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.