#347DA7
Closest named color: Cerulean (#457B9D). oklch(56.3% 0.097 237.3), rgb(52, 125, 167).
Aa
Black text reads best on this color (4.63:1).
About this color
#347DA7 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 56%, its chroma 0.097 and its hue 237°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean (#457B9D), ΔE 0.019 away. Black text reads best on it, at 4.63:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.097) |
| Temperature | cool |
| Nearest name | Cerulean (#457B9D) |
| Black text | 4.63:1 |
| White text | 4.52:1 |
Values
| HEX | #347DA7 |
| RGB | rgb(52, 125, 167) |
| HSL | hsl(202, 53%, 43%) |
| OKLCH | oklch(56.3% 0.097 237.3) |
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 #347DA7 | 4.52:1 | AA | Lc -76.7 | Fine for body text |
| Black text on #347DA7 | 4.63:1 | AA | Lc 32.9 | Non-text elements, placeholder text |
| #347DA7 text on white | 4.52:1 | AA | Lc 71.2 | Content text, not long reading |
| #347DA7 text on black | 4.63:1 | AA | Lc -30.5 | 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 600.
-
Step 50
50
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E2EBF1
oklch(93.5% 0.013 236.6)
-
Step 200
200
#CBDCE7
oklch(88.5% 0.024 236)
-
Step 300
300
#A7C5DA
oklch(80.8% 0.044 238.6)
-
Step 400
400
#77A8C7
oklch(70.8% 0.069 236.8)
-
Step 500
500
#5191B9
oklch(63% 0.089 237.9)
-
Step 600
600 (this color)
#347DA7
oklch(56.3% 0.097 237.3)
-
Step 700
700
#24688D
oklch(49.2% 0.089 236.7)
-
Step 800
800
#205573
oklch(42.8% 0.074 237.1)
-
Step 900
900
#20465D
oklch(37.7% 0.059 237.6)
-
Step 950
950
#142936
oklch(27% 0.036 237.4)
#347DA7 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) | #697DA9 | 0.056 |
| Deuteranopia (no green cones) | #5971A6 | 0.046 |
| Tritanopia (no blue cones) | #00888B | 0.066 |
| Achromatopsia (no color) | #767676 | 0.097 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #347DA7
#347DA7
oklch(56.3% 0.097 237.3)
- #A06638
#A06638
oklch(56.4% 0.097 57.5)
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 #347DA7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean #457B9D ΔE 0.019
- Nice Blue #107AB0 ΔE 0.026
- Dull Blue #49759C ΔE 0.028
- Stormy Blue #507B9C ΔE 0.028
- Steel Blue #4682B4 ΔE 0.029
- Flat Blue #3C73A8 ΔE 0.030
- Muted Blue #3B719F ΔE 0.034
- Blue NCS #118AB2 ΔE 0.037
Use #347DA7 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.