#347B9E
Closest named color: Cerulean (#457B9D). oklch(55.3% 0.089 233.1), rgb(52, 123, 158).
Aa
White text reads best on this color (4.69:1).
About this color
#347B9E is a medium-dark, moderately saturated blue. In OKLCH its lightness is 55%, its chroma 0.089 and its hue 233°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean (#457B9D), ΔE 0.014 away. White text reads best on it, at 4.69:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.089) |
| Temperature | cool |
| Nearest name | Cerulean (#457B9D) |
| Black text | 4.47:1 |
| White text | 4.69:1 |
Values
| HEX | #347B9E |
| RGB | rgb(52, 123, 158) |
| HSL | hsl(200, 50%, 41%) |
| OKLCH | oklch(55.3% 0.089 233.1) |
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 #347B9E | 4.69:1 | AA | Lc -77.8 | Fine for body text |
| Black text on #347B9E | 4.47:1 | AA large text | Lc 31.7 | Non-text elements, placeholder text |
| #347B9E text on white | 4.69:1 | AA | Lc 72.4 | Content text, not long reading |
| #347B9E text on black | 4.47:1 | AA large text | Lc -29.3 | 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
#F2F6F8
oklch(97.1% 0.005 228.8)
-
Step 100
100
#E3EBF0
oklch(93.5% 0.011 234.8)
-
Step 200
200
#CBDCE6
oklch(88.5% 0.023 233.4)
-
Step 300
300
#A8C6D7
oklch(81% 0.04 232.8)
-
Step 400
400
#78A8C2
oklch(70.7% 0.064 232.5)
-
Step 500
500
#5392B3
oklch(63.1% 0.082 233)
-
Step 600
600 (this color)
#347B9E
oklch(55.3% 0.089 233.1)
-
Step 700
700
#276888
oklch(49.1% 0.083 233.5)
-
Step 800
800
#22556E
oklch(42.7% 0.068 232.9)
-
Step 900
900
#214659
oklch(37.6% 0.053 233)
-
Step 950
950
#142934
oklch(26.9% 0.034 232.8)
#347B9E 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) | #6A7AA0 | 0.058 |
| Deuteranopia (no green cones) | #5B6F9D | 0.049 |
| Tritanopia (no blue cones) | #008487 | 0.056 |
| Achromatopsia (no color) | #747474 | 0.089 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #347B9E
#347B9E
oklch(55.3% 0.089 233.1)
- #9B633F
#9B633F
oklch(55.3% 0.089 52.7)
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 #347B9E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean #457B9D ΔE 0.014
- Dull Blue #49759C ΔE 0.023
- Stormy Blue #507B9C ΔE 0.026
- Muted Blue #3B719F ΔE 0.030
- Ocean #017B92 ΔE 0.031
- Flat Blue #3C73A8 ΔE 0.032
- Nice Blue #107AB0 ΔE 0.033
- Metallic Blue #4F738E ΔE 0.035
Use #347B9E 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.