#1F3C97
Closest named color: Sapphire (#2138AB). oklch(39.5% 0.153 266), rgb(31, 60, 151).
Aa
White text reads best on this color (9.76:1).
About this color
#1F3C97 is a dark, vivid blue. In OKLCH its lightness is 40%, its chroma 0.153 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.034 away. White text reads best on it, at 9.76:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | vivid (0.153) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.15:1 |
| White text | 9.76:1 |
Values
| HEX | #1F3C97 |
| RGB | rgb(31, 60, 151) |
| HSL | hsl(226, 66%, 36%) |
| OKLCH | oklch(39.5% 0.153 266) |
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 #1F3C97 | 9.76:1 | AAA | Lc -96.3 | Preferred for body text |
| Black text on #1F3C97 | 2.15:1 | Fails | Lc 11.9 | Not readable |
| #1F3C97 text on white | 9.76:1 | AAA | Lc 92.1 | Preferred for body text |
| #1F3C97 text on black | 2.15:1 | Fails | Lc -10.3 | 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 900.
-
Step 50
50
#F1F5FF
oklch(97% 0.014 268.5)
-
Step 100
100
#E0EAFF
oklch(93.6% 0.03 265.3)
-
Step 200
200
#C8D9FF
oklch(88.5% 0.056 266.2)
-
Step 300
300
#A4C0FF
oklch(81% 0.095 265.8)
-
Step 400
400
#749CFF
oklch(70.8% 0.152 266)
-
Step 500
500
#507FFF
oklch(63.1% 0.197 265.8)
-
Step 600
600
#2F5DFF
oklch(55.5% 0.245 265.9)
-
Step 700
700
#2248E4
oklch(49.1% 0.237 266)
-
Step 800
800
#1C3DB8
oklch(42.7% 0.196 265.9)
-
Step 900
900 (this color)
#1F3C97
oklch(39.5% 0.153 266)
-
Step 950
950
#102155
oklch(27% 0.097 266.2)
#1F3C97 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) | #004A9A | 0.037 |
| Deuteranopia (no green cones) | #003E95 | 0.018 |
| Tritanopia (no blue cones) | #005363 | 0.120 |
| Achromatopsia (no color) | #444444 | 0.153 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F3C97
#1F3C97
oklch(39.5% 0.153 266)
- #5A4200
#5A4200
oklch(39.5% 0.081 85)
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 #1F3C97, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.034
- Cobalt #1E488F ΔE 0.035
- Blueberry #464196 ΔE 0.055
- Twilight Blue #0A437A ΔE 0.055
- Dark Slate Blue #483D8B ΔE 0.059
- Light Navy #155084 ΔE 0.066
- Dusk Blue #26538D ΔE 0.069
- Indigo Blue #3A18B1 ΔE 0.075
Use #1F3C97 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.