#3A799F
Closest named color: Cerulean (#457B9D). oklch(55.1% 0.088 237.8), rgb(58, 121, 159).
Aa
White text reads best on this color (4.75:1).
About this color
#3A799F is a medium-dark, moderately saturated blue. In OKLCH its lightness is 55%, its chroma 0.088 and its hue 238°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean (#457B9D), ΔE 0.013 away. White text reads best on it, at 4.75:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.088) |
| Temperature | cool |
| Nearest name | Cerulean (#457B9D) |
| Black text | 4.41:1 |
| White text | 4.75:1 |
Values
| HEX | #3A799F |
| RGB | rgb(58, 121, 159) |
| HSL | hsl(203, 47%, 43%) |
| OKLCH | oklch(55.1% 0.088 237.8) |
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 #3A799F | 4.75:1 | AA | Lc -78.3 | Fine for body text |
| Black text on #3A799F | 4.41:1 | AA large text | Lc 31.3 | Non-text elements, placeholder text |
| #3A799F text on white | 4.75:1 | AA | Lc 72.8 | Content text, not long reading |
| #3A799F text on black | 4.41:1 | AA large text | Lc -28.9 | Dividers and decoration only |
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 600.
-
Step 50
50
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E3EBF1
oklch(93.6% 0.012 239.9)
-
Step 200
200
#CCDCE6
oklch(88.5% 0.022 235)
-
Step 300
300
#AAC5D7
oklch(80.9% 0.039 237.2)
-
Step 400
400
#7BA7C4
oklch(70.7% 0.064 237.7)
-
Step 500
500
#5891B5
oklch(63.2% 0.081 237.7)
-
Step 600
600 (this color)
#3A799F
oklch(55.1% 0.088 237.8)
-
Step 700
700
#2D6789
oklch(49.1% 0.081 237.4)
-
Step 800
800
#275470
oklch(42.7% 0.068 238.5)
-
Step 900
900
#25465A
oklch(37.8% 0.052 236.9)
-
Step 950
950
#162935
oklch(27.1% 0.033 237.5)
#3A799F 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) | #6779A1 | 0.050 |
| Deuteranopia (no green cones) | #596E9E | 0.042 |
| Tritanopia (no blue cones) | #008386 | 0.063 |
| Achromatopsia (no color) | #737373 | 0.088 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3A799F
#3A799F
oklch(55.1% 0.088 237.8)
- #98643B
#98643B
oklch(55% 0.088 57.8)
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 #3A799F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean #457B9D ΔE 0.013
- Dull Blue #49759C ΔE 0.016
- Stormy Blue #507B9C ΔE 0.023
- Muted Blue #3B719F ΔE 0.024
- Flat Blue #3C73A8 ΔE 0.025
- Metallic Blue #4F738E ΔE 0.031
- Nice Blue #107AB0 ΔE 0.032
- Ocean #017B92 ΔE 0.037
Use #3A799F 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.