#129BD9
Closest named color: Dark Sky Blue (#448EE4). oklch(65.3% 0.138 236.6), rgb(18, 155, 217).
Aa
Black text reads best on this color (6.71:1).
About this color
#129BD9 is a medium-light, moderately saturated blue. In OKLCH its lightness is 65%, its chroma 0.138 and its hue 237°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.046 away. Black text reads best on it, at 6.71:1.
| Hue family | Blues |
| Lightness | medium-light (65%) |
| Chroma | moderately saturated (0.138) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.71:1 |
| White text | 3.12:1 |
Values
| HEX | #129BD9 |
| RGB | rgb(18, 155, 217) |
| HSL | hsl(199, 85%, 46%) |
| OKLCH | oklch(65.3% 0.138 236.6) |
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 #129BD9 | 3.12:1 | AA large text | Lc -63.1 | Content text, not long reading |
| Black text on #129BD9 | 6.71:1 | AA | Lc 46.3 | Large or bold text, headings |
| #129BD9 text on white | 3.12:1 | AA large text | Lc 57.7 | Large or bold text, headings |
| #129BD9 text on black | 6.71:1 | AA | Lc -44.0 | 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
#F0F6FB
oklch(97% 0.009 242.8)
-
Step 100
100
#DEECF6
oklch(93.6% 0.02 238.7)
-
Step 200
200
#C3DEEF
oklch(88.6% 0.037 235.5)
-
Step 300
300
#97C8E7
oklch(80.9% 0.068 236.5)
-
Step 400
400
#57AADB
oklch(70.6% 0.108 237)
-
Step 500
500 (this color)
#129BD9
oklch(65.3% 0.138 236.6)
-
Step 600
600
#007CB0
oklch(55.5% 0.121 236.7)
-
Step 700
700
#006895
oklch(49% 0.107 237)
-
Step 800
800
#00557B
oklch(42.6% 0.093 237.2)
-
Step 900
900
#004767
oklch(37.7% 0.082 236.6)
-
Step 950
950
#012A3F
oklch(27% 0.058 237)
#129BD9 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) | #7D9BDC | 0.079 |
| Deuteranopia (no green cones) | #648AD8 | 0.064 |
| Tritanopia (no blue cones) | #00ABB1 | 0.087 |
| Achromatopsia (no color) | #929292 | 0.139 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #129BD9
#129BD9
oklch(65.3% 0.138 236.6)
- #CE772D
#CE772D
oklch(65.3% 0.138 56.6)
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 #129BD9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.046
- Chefchaouen Blue #4895EF ΔE 0.048
- Water Blue #0E87CC ΔE 0.057
- Cornflower Blue #6495ED ΔE 0.064
- Faded Blue #658CBB ΔE 0.067
- Blue NCS #118AB2 ΔE 0.069
- Dodger Blue #1E90FF ΔE 0.070
- Cool Blue #4984B8 ΔE 0.072
Use #129BD9 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.