#138DDD
Closest named color: Dark Sky Blue (#448EE4). oklch(62.3% 0.154 245.7), rgb(19, 141, 221).
Aa
Black text reads best on this color (5.88:1).
About this color
#138DDD is a medium-light, vivid blue. In OKLCH its lightness is 62%, its chroma 0.154 and its hue 246°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.029 away. Black text reads best on it, at 5.88:1.
| Hue family | Blues |
| Lightness | medium-light (62%) |
| Chroma | vivid (0.154) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 5.88:1 |
| White text | 3.57:1 |
Values
| HEX | #138DDD |
| RGB | rgb(19, 141, 221) |
| HSL | hsl(204, 84%, 47%) |
| OKLCH | oklch(62.3% 0.154 245.7) |
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 #138DDD | 3.57:1 | AA large text | Lc -68.2 | Content text, not long reading |
| Black text on #138DDD | 5.88:1 | AA | Lc 41.4 | Non-text elements, placeholder text |
| #138DDD text on white | 3.57:1 | AA large text | Lc 62.7 | Content text, not long reading |
| #138DDD text on black | 5.88:1 | AA | Lc -39.0 | 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 500.
-
Step 50
50
#F0F6FC
oklch(97% 0.01 247.9)
-
Step 100
100
#DEECF8
oklch(93.6% 0.022 243.8)
-
Step 200
200
#C3DDF4
oklch(88.6% 0.042 245)
-
Step 300
300
#98C6EF
oklch(80.8% 0.076 245.8)
-
Step 400
400
#5BA7E7
oklch(70.6% 0.121 246)
-
Step 500
500 (this color)
#138DDD
oklch(62.3% 0.154 245.7)
-
Step 600
600
#0078C0
oklch(55.5% 0.142 245.8)
-
Step 700
700
#0065A3
oklch(49.1% 0.126 245.9)
-
Step 800
800
#005386
oklch(42.8% 0.108 245.3)
-
Step 900
900
#004571
oklch(37.8% 0.096 245.5)
-
Step 950
950
#042943
oklch(27.1% 0.063 244.6)
#138DDD 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) | #6691E0 | 0.060 |
| Deuteranopia (no green cones) | #4980DB | 0.041 |
| Tritanopia (no blue cones) | #00A1AA | 0.109 |
| Achromatopsia (no color) | #878787 | 0.154 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #138DDD
#138DDD
oklch(62.3% 0.154 245.7)
- #BE7300
#BE7300
oklch(62.3% 0.139 66.1)
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 #138DDD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.029
- Water Blue #0E87CC ΔE 0.029
- Chefchaouen Blue #4895EF ΔE 0.047
- Dodger Blue #1E90FF ΔE 0.052
- Cool Blue #4984B8 ΔE 0.059
- Soft Blue #6488EA ΔE 0.061
- Steel Blue #4682B4 ΔE 0.065
- Windows Blue #3778BF ΔE 0.066
Use #138DDD 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.