#3A99DF
Closest named color: Chefchaouen Blue (#4895EF). oklch(65.9% 0.136 244.6), rgb(58, 153, 223).
Aa
Black text reads best on this color (6.80:1).
About this color
#3A99DF is a medium-light, moderately saturated blue. In OKLCH its lightness is 66%, its chroma 0.136 and its hue 245°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.030 away. Black text reads best on it, at 6.80:1.
| Hue family | Blues |
| Lightness | medium-light (66%) |
| Chroma | moderately saturated (0.136) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 6.80:1 |
| White text | 3.08:1 |
Values
| HEX | #3A99DF |
| RGB | rgb(58, 153, 223) |
| HSL | hsl(205, 72%, 55%) |
| OKLCH | oklch(65.9% 0.136 244.6) |
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 #3A99DF | 3.08:1 | AA large text | Lc -62.8 | Content text, not long reading |
| Black text on #3A99DF | 6.80:1 | AA | Lc 46.6 | Large or bold text, headings |
| #3A99DF text on white | 3.08:1 | AA large text | Lc 57.4 | Large or bold text, headings |
| #3A99DF text on black | 6.80:1 | AA | Lc -44.3 | 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
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E0ECF6
oklch(93.7% 0.019 243)
-
Step 200
200
#C5DCF0
oklch(88.4% 0.037 244.4)
-
Step 300
300
#9DC6E9
oklch(80.9% 0.066 244.5)
-
Step 400
400
#63A7DF
oklch(70.6% 0.108 245)
-
Step 500
500 (this color)
#3A99DF
oklch(65.9% 0.136 244.6)
-
Step 600
600
#0079BE
oklch(55.6% 0.139 244.6)
-
Step 700
700
#0066A1
oklch(49.2% 0.123 244.5)
-
Step 800
800
#005385
oklch(42.7% 0.107 244.8)
-
Step 900
900
#08456D
oklch(37.7% 0.089 244.6)
-
Step 950
950
#092940
oklch(27.1% 0.056 244.1)
#3A99DF 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) | #799BE2 | 0.059 |
| Deuteranopia (no green cones) | #628CDE | 0.044 |
| Tritanopia (no blue cones) | #00AAB2 | 0.097 |
| Achromatopsia (no color) | #939393 | 0.136 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3A99DF
#3A99DF
oklch(65.9% 0.136 244.6)
- #CA7E23
#CA7E23
oklch(65.9% 0.136 64.9)
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 #3A99DF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.030
- Dark Sky Blue #448EE4 ΔE 0.032
- Cornflower Blue #6495ED ΔE 0.044
- Dodger Blue #1E90FF ΔE 0.059
- Soft Blue #6488EA ΔE 0.060
- Water Blue #0E87CC ΔE 0.061
- Faded Blue #658CBB ΔE 0.063
- Cool Blue #4984B8 ΔE 0.072
Use #3A99DF 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.