#137CAE
Closest named color: Nice Blue (#107AB0). oklch(55.6% 0.116 236.8), rgb(19, 124, 174).
Aa
White text reads best on this color (4.64:1).
About this color
#137CAE is a medium-dark, moderately saturated blue. In OKLCH its lightness is 56%, its chroma 0.116 and its hue 237°. Its hue sits on the cool side of the wheel. The nearest named color is Nice Blue (#107AB0), ΔE 0.007 away. White text reads best on it, at 4.64:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.116) |
| Temperature | cool |
| Nearest name | Nice Blue (#107AB0) |
| Black text | 4.52:1 |
| White text | 4.64:1 |
Values
| HEX | #137CAE |
| RGB | rgb(19, 124, 174) |
| HSL | hsl(199, 80%, 38%) |
| OKLCH | oklch(55.6% 0.116 236.8) |
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 #137CAE | 4.64:1 | AA | Lc -77.2 | Fine for body text |
| Black text on #137CAE | 4.52:1 | AA | Lc 32.3 | Non-text elements, placeholder text |
| #137CAE text on white | 4.64:1 | AA | Lc 71.8 | Content text, not long reading |
| #137CAE text on black | 4.52:1 | AA | Lc -29.9 | 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
#F1F6FA
oklch(97.1% 0.008 241.7)
-
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
#A1C6DE
oklch(80.8% 0.052 236.7)
-
Step 400
400
#6CA9CE
oklch(70.7% 0.083 236.3)
-
Step 500
500
#4093C2
oklch(63.2% 0.107 236.8)
-
Step 600
600 (this color)
#137CAE
oklch(55.6% 0.116 236.8)
-
Step 700
700
#006895
oklch(49% 0.107 237)
-
Step 800
800
#095579
oklch(42.6% 0.089 236.8)
-
Step 900
900
#154762
oklch(37.8% 0.069 236.7)
-
Step 950
950
#0E2939
oklch(26.8% 0.044 237.6)
#137CAE 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) | #647CB0 | 0.066 |
| Deuteranopia (no green cones) | #506EAD | 0.054 |
| Tritanopia (no blue cones) | #00898D | 0.074 |
| Achromatopsia (no color) | #747474 | 0.116 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #137CAE
#137CAE
oklch(55.6% 0.116 236.8)
- #A55F24
#A55F24
oklch(55.5% 0.116 56.7)
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 #137CAE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Nice Blue #107AB0 ΔE 0.007
- Flat Blue #3C73A8 ΔE 0.031
- Muted Blue #3B719F ΔE 0.037
- Windows Blue #3778BF ΔE 0.037
- Cerulean #457B9D ΔE 0.038
- Steel Blue #4682B4 ΔE 0.040
- Ocean Blue #03719C ΔE 0.040
- Blue NCS #118AB2 ΔE 0.041
Use #137CAE 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.