Short answer — these are the top apps to shop Muslimah (hijab / modest) fashion in Singapore, depending on what you want:

• Zalora — best all‑rounder for both local modest brands (Naelofar, Lubna, Zalia, etc.) and international labels; good search/filtering, fast delivery and returns. (apps.apple.com)
• HIJUP — focused Islamic/modest fashion (many Indonesian designers); good if you want a dedicated modest‑wear marketplace and curated designer pieces. (apps.apple.com)
• Shopee / Lazada — best for variety, frequent discounts and local sellers (instant hijabs, shawls, basic pieces and cheaper options). (Many Muslimah brands and official stockists sell here.) (shop-sg.tiktok.com)
• Brand apps / shops (Naelofar, dUCk, Zalia, Lubna, Simply Rays, etc.) — best when you want the latest collections, limited drops or full-size ranges; many ship to Singapore or have local stockists. (miesya.com)
• Carousell / TikTok Shop — best for sold‑out items, pre‑loved or bargain finds (popular for shawls/hijabs from Naelofar, dUCk, Ariani). (Carousell.sg)

Which to pick:

• If you want curated, trendy modest outfits and easy returns: start with Zalora. (apps.apple.com)
• If you want specialist Islamic fashion / designer modestwear: try HIJUP or the brand’s own app/site. (apps.apple.com)
• If you want bargains, wide seller choice or second‑hand pieces: Shopee/Lazada/Carousell/TikTok Shop. (shop-sg.tiktok.com)

If you want, I can:

• pick the best app for your budget and style (casual, formal, baju kurung, instant shawls), or
• show the exact app links and how to filter for modest wear on each app.