#137AAA
Closest named color: Nice Blue (#107AB0). oklch(54.9% 0.113 236.2), rgb(19, 122, 170).
Aa
White text reads best on this color (4.78:1).
About this color
#137AAA is a medium-dark, moderately saturated blue. In OKLCH its lightness is 55%, its chroma 0.113 and its hue 236°. Its hue sits on the cool side of the wheel. The nearest named color is Nice Blue (#107AB0), ΔE 0.010 away. White text reads best on it, at 4.78:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.113) |
| Temperature | cool |
| Nearest name | Nice Blue (#107AB0) |
| Black text | 4.39:1 |
| White text | 4.78:1 |
Values
| HEX | #137AAA |
| RGB | rgb(19, 122, 170) |
| HSL | hsl(199, 80%, 37%) |
| OKLCH | oklch(54.9% 0.113 236.2) |
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 #137AAA | 4.78:1 | AA | Lc -78.1 | Fine for body text |
| Black text on #137AAA | 4.39:1 | AA large text | Lc 31.4 | Non-text elements, placeholder text |
| #137AAA text on white | 4.78:1 | AA | Lc 72.7 | Content text, not long reading |
| #137AAA text on black | 4.39:1 | AA large text | Lc -29.0 | 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
#E1ECF3
oklch(93.7% 0.015 235.4)
-
Step 200
200
#C8DDEA
oklch(88.6% 0.029 234.9)
-
Step 300
300
#A2C6DE
oklch(80.8% 0.051 237.5)
-
Step 400
400
#6DA9CD
oklch(70.7% 0.082 235.9)
-
Step 500
500
#4193C0
oklch(63.2% 0.104 235.8)
-
Step 600
600 (this color)
#137AAA
oklch(54.9% 0.113 236.2)
-
Step 700
700
#026894
oklch(49% 0.106 236.5)
-
Step 800
800
#0C5578
oklch(42.6% 0.087 236.5)
-
Step 900
900
#164761
oklch(37.8% 0.068 236)
-
Step 950
950
#0F2A39
oklch(27.2% 0.043 235.7)
#137AAA 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) | #637AAC | 0.066 |
| Deuteranopia (no green cones) | #4F6DA9 | 0.052 |
| Tritanopia (no blue cones) | #00868B | 0.069 |
| Achromatopsia (no color) | #727272 | 0.113 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #137AAA
#137AAA
oklch(54.9% 0.113 236.2)
- #A25E25
#A25E25
oklch(54.9% 0.113 56.8)
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 #137AAA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Nice Blue #107AB0 ΔE 0.010
- Flat Blue #3C73A8 ΔE 0.028
- Muted Blue #3B719F ΔE 0.032
- Ocean Blue #03719C ΔE 0.033
- Sea Blue #047495 ΔE 0.036
- Cerulean #457B9D ΔE 0.037
- Dull Blue #49759C ΔE 0.039
- Ocean #017B92 ΔE 0.040
Use #137AAA 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.