#137FDC
Closest named color: Water Blue (#0E87CC). oklch(59% 0.167 251.5), rgb(19, 127, 220).
Aa
Black text reads best on this color (5.09:1).
About this color
#137FDC is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.167 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.036 away. Black text reads best on it, at 5.09:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.167) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.09:1 |
| White text | 4.12:1 |
Values
| HEX | #137FDC |
| RGB | rgb(19, 127, 220) |
| HSL | hsl(208, 84%, 47%) |
| OKLCH | oklch(59% 0.167 251.5) |
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 #137FDC | 4.12:1 | AA large text | Lc -73.2 | Content text, not long reading |
| Black text on #137FDC | 5.09:1 | AA | Lc 36.4 | Non-text elements, placeholder text |
| #137FDC text on white | 4.12:1 | AA large text | Lc 67.7 | Content text, not long reading |
| #137FDC text on black | 5.09:1 | AA | Lc -34.0 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E0EBF8
oklch(93.6% 0.021 252.5)
-
Step 200
200
#C6DCF5
oklch(88.6% 0.042 251.7)
-
Step 300
300
#9DC5F0
oklch(81% 0.075 250.6)
-
Step 400
400
#65A5E9
oklch(70.7% 0.12 251.2)
-
Step 500
500
#358CE2
oklch(63% 0.153 251.5)
-
Step 600
600 (this color)
#137FDC
oklch(59% 0.167 251.5)
-
Step 700
700
#0062AF
oklch(49.2% 0.144 251.3)
-
Step 800
800
#005091
oklch(42.8% 0.126 251.5)
-
Step 900
900
#0E4374
oklch(37.7% 0.099 251.2)
-
Step 950
950
#0B2744
oklch(26.9% 0.064 252.1)
#137FDC 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) | #4F86E0 | 0.046 |
| Deuteranopia (no green cones) | #2975DA | 0.026 |
| Tritanopia (no blue cones) | #0095A3 | 0.121 |
| Achromatopsia (no color) | #7D7D7D | 0.167 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #137FDC
#137FDC
oklch(59% 0.167 251.5)
- #AB6E00
#AB6E00
oklch(58.9% 0.127 71.3)
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 #137FDC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.036
- Windows Blue #3778BF ΔE 0.046
- Dark Sky Blue #448EE4 ΔE 0.054
- Clear Blue #247AFD ΔE 0.054
- Cerulean Blue #056EEE ΔE 0.055
- Royal Blue #4169E1 ΔE 0.059
- Dodger Blue #1E90FF ΔE 0.066
- Cool Blue #4984B8 ΔE 0.067
Use #137FDC 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.