#3F97BF
Closest named color: Faded Blue (#658CBB). oklch(64% 0.102 231.1), rgb(63, 151, 191).
Aa
Black text reads best on this color (6.39:1).
About this color
#3F97BF is a medium-light, moderately saturated blue. In OKLCH its lightness is 64%, its chroma 0.102 and its hue 231°. Its hue sits on the cool side of the wheel. The nearest named color is Faded Blue (#658CBB), ΔE 0.042 away. Black text reads best on it, at 6.39:1.
| Hue family | Blues |
| Lightness | medium-light (64%) |
| Chroma | moderately saturated (0.102) |
| Temperature | cool |
| Nearest name | Faded Blue (#658CBB) |
| Black text | 6.39:1 |
| White text | 3.28:1 |
Values
| HEX | #3F97BF |
| RGB | rgb(63, 151, 191) |
| HSL | hsl(199, 50%, 50%) |
| OKLCH | oklch(64% 0.102 231.1) |
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 #3F97BF | 3.28:1 | AA large text | Lc -65.4 | Content text, not long reading |
| Black text on #3F97BF | 6.39:1 | AA | Lc 44.1 | Non-text elements, placeholder text |
| #3F97BF text on white | 3.28:1 | AA large text | Lc 59.9 | Large or bold text, headings |
| #3F97BF text on black | 6.39:1 | AA | Lc -41.8 | 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
#F1F6F9
oklch(97% 0.007 233.6)
-
Step 100
100
#E1ECF2
oklch(93.7% 0.014 231.2)
-
Step 200
200
#C8DDE8
oklch(88.5% 0.027 230.4)
-
Step 300
300
#A1C7DB
oklch(80.9% 0.049 231.1)
-
Step 400
400
#6AAACA
oklch(70.7% 0.081 231.2)
-
Step 500
500 (this color)
#3F97BF
oklch(64% 0.102 231.1)
-
Step 600
600
#057EA8
oklch(55.6% 0.111 230.8)
-
Step 700
700
#006A8E
oklch(49.1% 0.099 230.6)
-
Step 800
800
#015775
oklch(42.8% 0.085 230.4)
-
Step 900
900
#12485E
oklch(37.8% 0.066 229.9)
-
Step 950
950
#0D2A37
oklch(27% 0.042 230.5)
#3F97BF 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) | #8395C1 | 0.070 |
| Deuteranopia (no green cones) | #7188BE | 0.060 |
| Tritanopia (no blue cones) | #00A2A4 | 0.064 |
| Achromatopsia (no color) | #8E8E8E | 0.103 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F97BF
#3F97BF
oklch(64% 0.102 231.1)
- #BE7950
#BE7950
oklch(64% 0.103 50.8)
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 #3F97BF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Faded Blue #658CBB ΔE 0.042
- Blue NCS #118AB2 ΔE 0.049
- Dusty Blue #5A86AD ΔE 0.050
- Cool Blue #4984B8 ΔE 0.052
- Off Blue #5684AE ΔE 0.054
- Steel Blue #4682B4 ΔE 0.058
- Silver Lake Blue #778DA9 ΔE 0.061
- Water Blue #0E87CC ΔE 0.062
Use #3F97BF 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.