#138BD5
Closest named color: Water Blue (#0E87CC). oklch(61.4% 0.147 244.1), rgb(19, 139, 213).
Aa
Black text reads best on this color (5.68:1).
About this color
#138BD5 is a medium-dark, vivid blue. In OKLCH its lightness is 61%, its chroma 0.147 and its hue 244°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.017 away. Black text reads best on it, at 5.68:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | vivid (0.147) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.68:1 |
| White text | 3.69:1 |
Values
| HEX | #138BD5 |
| RGB | rgb(19, 139, 213) |
| HSL | hsl(203, 84%, 45%) |
| OKLCH | oklch(61.4% 0.147 244.1) |
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 #138BD5 | 3.69:1 | AA large text | Lc -69.5 | Content text, not long reading |
| Black text on #138BD5 | 5.68:1 | AA | Lc 40.1 | Non-text elements, placeholder text |
| #138BD5 text on white | 3.69:1 | AA large text | Lc 64.0 | Content text, not long reading |
| #138BD5 text on black | 5.68:1 | AA | Lc -37.7 | 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 500.
-
Step 50
50
#F0F6FC
oklch(97% 0.01 247.9)
-
Step 100
100
#DFECF7
oklch(93.7% 0.02 243.4)
-
Step 200
200
#C4DDF2
oklch(88.6% 0.039 243.5)
-
Step 300
300
#99C6EC
oklch(80.8% 0.072 244.3)
-
Step 400
400
#5DA8E3
oklch(70.7% 0.115 244.2)
-
Step 500
500 (this color)
#138BD5
oklch(61.4% 0.147 244.1)
-
Step 600
600
#0079BD
oklch(55.5% 0.138 244.2)
-
Step 700
700
#0066A0
oklch(49.2% 0.121 244)
-
Step 800
800
#005384
oklch(42.6% 0.106 244.3)
-
Step 900
900
#00456F
oklch(37.6% 0.093 244.3)
-
Step 950
950
#052942
oklch(27.1% 0.061 244.2)
#138BD5 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) | #678ED8 | 0.062 |
| Deuteranopia (no green cones) | #4C7ED4 | 0.044 |
| Tritanopia (no blue cones) | #009DA6 | 0.100 |
| Achromatopsia (no color) | #858585 | 0.147 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #138BD5
#138BD5
oklch(61.4% 0.147 244.1)
- #BC6F00
#BC6F00
oklch(61.3% 0.138 64.3)
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 #138BD5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.017
- Dark Sky Blue #448EE4 ΔE 0.037
- Cool Blue #4984B8 ΔE 0.049
- Steel Blue #4682B4 ΔE 0.054
- Blue NCS #118AB2 ΔE 0.054
- Windows Blue #3778BF ΔE 0.056
- Chefchaouen Blue #4895EF ΔE 0.057
- Dodger Blue #1E90FF ΔE 0.064
Use #138BD5 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.