#129EF0
Closest named color: Chefchaouen Blue (#4895EF). oklch(67.3% 0.16 243.5), rgb(18, 158, 240).
Aa
Black text reads best on this color (7.17:1).
About this color
#129EF0 is a medium-light, vivid blue. In OKLCH its lightness is 67%, its chroma 0.160 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.031 away. Black text reads best on it, at 7.17:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | vivid (0.160) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 7.17:1 |
| White text | 2.92:1 |
Values
| HEX | #129EF0 |
| RGB | rgb(18, 158, 240) |
| HSL | hsl(202, 88%, 51%) |
| OKLCH | oklch(67.3% 0.16 243.5) |
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 #129EF0 | 2.92:1 | Fails | Lc -60.4 | Content text, not long reading |
| Black text on #129EF0 | 7.17:1 | AAA | Lc 49.0 | Large or bold text, headings |
| #129EF0 text on white | 2.92:1 | Fails | Lc 55.1 | Large or bold text, headings |
| #129EF0 text on black | 7.17:1 | AAA | Lc -46.7 | Large or bold text, headings |
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 400.
-
Step 50
50
#EEF7FE
oklch(97.1% 0.013 241)
-
Step 100
100
#DAEDFC
oklch(93.7% 0.029 241.6)
-
Step 200
200
#BADEFC
oklch(88.4% 0.056 243.6)
-
Step 300
300
#86C8FD
oklch(80.8% 0.101 243.7)
-
Step 400
400 (this color)
#129EF0
oklch(67.3% 0.16 243.5)
-
Step 500
500
#0091DE
oklch(63.1% 0.153 243.2)
-
Step 600
600
#007ABC
oklch(55.7% 0.136 243.3)
-
Step 700
700
#00669F
oklch(49.1% 0.12 243.6)
-
Step 800
800
#005383
oklch(42.6% 0.105 243.8)
-
Step 900
900
#00456E
oklch(37.6% 0.092 243.7)
-
Step 950
950
#002944
oklch(27% 0.066 243.6)
#129EF0 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) | #76A1F3 | 0.069 |
| Deuteranopia (no green cones) | #588FEE | 0.050 |
| Tritanopia (no blue cones) | #00B2BC | 0.109 |
| Achromatopsia (no color) | #979797 | 0.160 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #129EF0
#129EF0
oklch(67.3% 0.16 243.5)
- #D67E00
#D67E00
oklch(67.4% 0.153 63.6)
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 #129EF0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.031
- Dark Sky Blue #448EE4 ΔE 0.044
- Dodger Blue #1E90FF ΔE 0.047
- Cornflower Blue #6495ED ΔE 0.050
- Soft Blue #6488EA ΔE 0.069
- Water Blue #0E87CC ΔE 0.077
- Deep Sky Blue #00BFFF ΔE 0.089
- Faded Blue #658CBB ΔE 0.090
Use #129EF0 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.