#137CB7
Closest named color: Nice Blue (#107AB0). oklch(56.1% 0.126 241.2), rgb(19, 124, 183).
Aa
Black text reads best on this color (4.59:1).
About this color
#137CB7 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 56%, its chroma 0.126 and its hue 241°. Its hue sits on the cool side of the wheel. The nearest named color is Nice Blue (#107AB0), ΔE 0.012 away. Black text reads best on it, at 4.59:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.126) |
| Temperature | cool |
| Nearest name | Nice Blue (#107AB0) |
| Black text | 4.59:1 |
| White text | 4.57:1 |
Values
| HEX | #137CB7 |
| RGB | rgb(19, 124, 183) |
| HSL | hsl(202, 81%, 40%) |
| OKLCH | oklch(56.1% 0.126 241.2) |
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 #137CB7 | 4.57:1 | AA | Lc -76.7 | Fine for body text |
| Black text on #137CB7 | 4.59:1 | AA | Lc 32.9 | Non-text elements, placeholder text |
| #137CB7 text on white | 4.57:1 | AA | Lc 71.2 | Content text, not long reading |
| #137CB7 text on black | 4.59:1 | AA | Lc -30.4 | 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
#E1ECF4
oklch(93.7% 0.016 239.1)
-
Step 200
200
#C8DCEC
oklch(88.4% 0.031 242)
-
Step 300
300
#A1C6E2
oklch(80.9% 0.056 241)
-
Step 400
400
#6BA8D4
oklch(70.7% 0.09 241)
-
Step 500
500
#3E91C9
oklch(63% 0.116 241.6)
-
Step 600
600 (this color)
#137CB7
oklch(56.1% 0.126 241.2)
-
Step 700
700
#00679B
oklch(49.1% 0.115 241)
-
Step 800
800
#07547F
oklch(42.7% 0.097 241.6)
-
Step 900
900
#144666
oklch(37.8% 0.075 241.4)
-
Step 950
950
#0E293C
oklch(27% 0.048 242.2)
#137CB7 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) | #607DBA | 0.061 |
| Deuteranopia (no green cones) | #4A6FB6 | 0.047 |
| Tritanopia (no blue cones) | #008B91 | 0.085 |
| Achromatopsia (no color) | #767676 | 0.126 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #137CB7
#137CB7
oklch(56.1% 0.126 241.2)
- #A8600D
#A8600D
oklch(56% 0.126 61)
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 #137CB7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Nice Blue #107AB0 ΔE 0.012
- Windows Blue #3778BF ΔE 0.026
- Flat Blue #3C73A8 ΔE 0.034
- Steel Blue #4682B4 ΔE 0.039
- Water Blue #0E87CC ΔE 0.041
- Blue NCS #118AB2 ΔE 0.044
- Cool Blue #4984B8 ΔE 0.044
- Muted Blue #3B719F ΔE 0.045
Use #137CB7 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.