#129DE9
Closest named color: Chefchaouen Blue (#4895EF). oklch(66.6% 0.154 241.7), rgb(18, 157, 233).
Aa
Black text reads best on this color (7.02:1).
About this color
#129DE9 is a medium-light, vivid blue. In OKLCH its lightness is 67%, its chroma 0.154 and its hue 242°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.033 away. Black text reads best on it, at 7.02:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | vivid (0.154) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 7.02:1 |
| White text | 2.98:1 |
Values
| HEX | #129DE9 |
| RGB | rgb(18, 157, 233) |
| HSL | hsl(201, 86%, 49%) |
| OKLCH | oklch(66.6% 0.154 241.7) |
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 #129DE9 | 2.98:1 | Fails | Lc -61.3 | Content text, not long reading |
| Black text on #129DE9 | 7.02:1 | AAA | Lc 48.1 | Large or bold text, headings |
| #129DE9 text on white | 2.98:1 | Fails | Lc 55.9 | Large or bold text, headings |
| #129DE9 text on black | 7.02:1 | AAA | Lc -45.9 | 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 500.
-
Step 50
50
#F0F6FC
oklch(97% 0.01 247.9)
-
Step 100
100
#DEECF7
oklch(93.6% 0.021 241.4)
-
Step 200
200
#C2DDF3
oklch(88.5% 0.042 242.7)
-
Step 300
300
#95C7ED
oklch(80.8% 0.075 241.6)
-
Step 400
400
#54A9E5
oklch(70.7% 0.121 242)
-
Step 500
500 (this color)
#129DE9
oklch(66.6% 0.154 241.7)
-
Step 600
600
#007AB9
oklch(55.5% 0.132 242.1)
-
Step 700
700
#00679C
oklch(49.2% 0.116 241.5)
-
Step 800
800
#005481
oklch(42.7% 0.101 241.9)
-
Step 900
900
#00466C
oklch(37.7% 0.089 241.5)
-
Step 950
950
#002942
oklch(26.9% 0.063 241.6)
#129DE9 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) | #789FEC | 0.072 |
| Deuteranopia (no green cones) | #5C8DE8 | 0.055 |
| Tritanopia (no blue cones) | #00B0B8 | 0.103 |
| Achromatopsia (no color) | #959595 | 0.154 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #129DE9
#129DE9
oklch(66.6% 0.154 241.7)
- #D57A01
#D57A01
oklch(66.5% 0.153 61.6)
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 #129DE9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.033
- Dark Sky Blue #448EE4 ΔE 0.042
- Dodger Blue #1E90FF ΔE 0.052
- Cornflower Blue #6495ED ΔE 0.052
- Water Blue #0E87CC ΔE 0.069
- Soft Blue #6488EA ΔE 0.070
- Faded Blue #658CBB ΔE 0.082
- Cool Blue #4984B8 ΔE 0.089
Use #129DE9 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.