#2F37BA
Closest named color: Sapphire (#2138AB). oklch(42.7% 0.201 271.6), rgb(47, 55, 186).
Aa
White text reads best on this color (8.83:1).
About this color
#2F37BA is a dark, vivid blue. In OKLCH its lightness is 43%, its chroma 0.201 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.029 away. White text reads best on it, at 8.83:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | vivid (0.201) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.37:1 |
| White text | 8.83:1 |
Values
| HEX | #2F37BA |
| RGB | rgb(47, 55, 186) |
| HSL | hsl(237, 60%, 46%) |
| OKLCH | oklch(42.7% 0.201 271.6) |
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 #2F37BA | 8.83:1 | AAA | Lc -93.9 | Preferred for body text |
| Black text on #2F37BA | 2.37:1 | Fails | Lc 14.6 | Not readable |
| #2F37BA text on white | 8.83:1 | AAA | Lc 89.4 | Fine for body text |
| #2F37BA text on black | 2.37:1 | Fails | Lc -12.9 | 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
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E2E9FF
oklch(93.5% 0.031 271.7)
-
Step 200
200
#CCD8FF
oklch(88.6% 0.055 271.8)
-
Step 300
300
#AABDFF
oklch(80.8% 0.096 271.7)
-
Step 400
400
#7F98FF
oklch(70.6% 0.153 271.7)
-
Step 500
500
#617AFF
oklch(63% 0.198 271.6)
-
Step 600
600
#4857FF
oklch(55.6% 0.245 271.6)
-
Step 700
700
#3A40E6
oklch(49% 0.242 271.6)
-
Step 800
800 (this color)
#2F37BA
oklch(42.7% 0.201 271.6)
-
Step 900
900
#283393
oklch(37.8% 0.156 271.5)
-
Step 950
950
#171F56
oklch(27% 0.099 271.7)
#2F37BA 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) | #0051BE | 0.059 |
| Deuteranopia (no green cones) | #0043B8 | 0.036 |
| Tritanopia (no blue cones) | #005B74 | 0.157 |
| Achromatopsia (no color) | #4A4A4A | 0.202 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2F37BA
#2F37BA
oklch(42.7% 0.201 271.6)
- #604D00
#604D00
oklch(42.7% 0.087 92.5)
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 #2F37BA, closest first.
No curated palette has a color within ΔE 0.04 of #2F37BA.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.029
- Blue Blue #2242C7 ΔE 0.032
- Majorelle Blue #3F37C9 ΔE 0.032
- Indigo Blue #3A18B1 ΔE 0.051
- Blue With A Hint Of Purple #533CC6 ΔE 0.059
- Blurple #5539CC ΔE 0.065
- Violet Blue #510AC9 ΔE 0.069
- Blueberry #464196 ΔE 0.072
Use #2F37BA 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.