#2F3F97
Closest named color: Cobalt (#1E488F). oklch(40.9% 0.145 270.8), rgb(47, 63, 151).
Aa
White text reads best on this color (9.21:1).
About this color
#2F3F97 is a dark, vivid blue. In OKLCH its lightness is 41%, its chroma 0.145 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.031 away. White text reads best on it, at 9.21:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | vivid (0.145) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.27:1 |
| White text | 9.21:1 |
Values
| HEX | #2F3F97 |
| RGB | rgb(47, 63, 151) |
| HSL | hsl(231, 53%, 39%) |
| OKLCH | oklch(40.9% 0.145 270.8) |
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 #2F3F97 | 9.21:1 | AAA | Lc -95.2 | Preferred for body text |
| Black text on #2F3F97 | 2.27:1 | Fails | Lc 13.1 | Not readable |
| #2F3F97 text on white | 9.21:1 | AAA | Lc 90.8 | Preferred for body text |
| #2F3F97 text on black | 2.27:1 | Fails | Lc -11.5 | Not readable |
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 800.
-
Step 50
50
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E3E9FB
oklch(93.5% 0.025 271.1)
-
Step 200
200
#CDD8F9
oklch(88.4% 0.047 270.8)
-
Step 300
300
#ACBEF8
oklch(80.8% 0.085 271.1)
-
Step 400
400
#819BF5
oklch(70.8% 0.135 270.5)
-
Step 500
500
#647FF1
oklch(63.2% 0.173 270.7)
-
Step 600
600
#4D65DF
oklch(55.7% 0.187 270.7)
-
Step 700
700
#3E53C2
oklch(49.2% 0.174 270.5)
-
Step 800
800 (this color)
#2F3F97
oklch(40.9% 0.145 270.8)
-
Step 900
900
#2C3B7D
oklch(37.8% 0.113 270.5)
-
Step 950
950
#1A2349
oklch(27.1% 0.071 270.9)
#2F3F97 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) | #004C9A | 0.041 |
| Deuteranopia (no green cones) | #004395 | 0.034 |
| Tritanopia (no blue cones) | #005464 | 0.118 |
| Achromatopsia (no color) | #484848 | 0.145 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2F3F97
#2F3F97
oklch(40.9% 0.145 270.8)
- #5B4800
#5B4800
oklch(41% 0.084 91.5)
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 #2F3F97, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.031
- Blueberry #464196 ΔE 0.034
- Sapphire #2138AB ΔE 0.041
- Dark Slate Blue #483D8B ΔE 0.041
- Dusk Blue #26538D ΔE 0.059
- Twilight Blue #0A437A ΔE 0.060
- Light Navy #155084 ΔE 0.062
- Twilight #4E518B ΔE 0.074
Use #2F3F97 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.