#129CD5
Closest named color: Dark Sky Blue (#448EE4). oklch(65.4% 0.134 234.2), rgb(18, 156, 213).
Aa
Black text reads best on this color (6.74:1).
About this color
#129CD5 is a medium-light, moderately saturated blue. In OKLCH its lightness is 65%, its chroma 0.134 and its hue 234°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.052 away. Black text reads best on it, at 6.74:1.
| Hue family | Blues |
| Lightness | medium-light (65%) |
| Chroma | moderately saturated (0.134) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.74:1 |
| White text | 3.11:1 |
Values
| HEX | #129CD5 |
| RGB | rgb(18, 156, 213) |
| HSL | hsl(198, 84%, 45%) |
| OKLCH | oklch(65.4% 0.134 234.2) |
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 #129CD5 | 3.11:1 | AA large text | Lc -63.0 | Content text, not long reading |
| Black text on #129CD5 | 6.74:1 | AA | Lc 46.5 | Large or bold text, headings |
| #129CD5 text on white | 3.11:1 | AA large text | Lc 57.6 | Large or bold text, headings |
| #129CD5 text on black | 6.74:1 | AA | Lc -44.2 | 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
#F0F7FB
oklch(97.2% 0.009 232.4)
-
Step 100
100
#DEECF5
oklch(93.5% 0.019 235.7)
-
Step 200
200
#C3DEEE
oklch(88.6% 0.036 233.8)
-
Step 300
300
#97C8E5
oklch(80.8% 0.066 234.6)
-
Step 400
400
#57ABD8
oklch(70.7% 0.105 234.4)
-
Step 500
500 (this color)
#129CD5
oklch(65.4% 0.134 234.2)
-
Step 600
600
#007DAD
oklch(55.6% 0.117 234.3)
-
Step 700
700
#006992
oklch(49.1% 0.103 234.3)
-
Step 800
800
#005678
oklch(42.7% 0.089 233.9)
-
Step 900
900
#004865
oklch(37.8% 0.079 233.7)
-
Step 950
950
#012A3D
oklch(26.9% 0.056 234.3)
#129CD5 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) | #809BD8 | 0.082 |
| Deuteranopia (no green cones) | #678BD4 | 0.066 |
| Tritanopia (no blue cones) | #00ABB0 | 0.081 |
| Achromatopsia (no color) | #929292 | 0.134 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #129CD5
#129CD5
oklch(65.4% 0.134 234.2)
- #CE7736
#CE7736
oklch(65.4% 0.134 54.3)
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 #129CD5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.052
- Chefchaouen Blue #4895EF ΔE 0.055
- Water Blue #0E87CC ΔE 0.059
- Faded Blue #658CBB ΔE 0.066
- Blue NCS #118AB2 ΔE 0.066
- Cornflower Blue #6495ED ΔE 0.068
- Cool Blue #4984B8 ΔE 0.071
- Turquoise Blue #06B1C4 ΔE 0.072
Use #129CD5 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.