Here are popular apps available in Singapore where you can buy eco‑friendly fashion (grouped by type and with what they offer):

• ZALORA — has a dedicated “Earth Edit” / sustainable selection (pre‑loved, sustainable materials, fair/eco production tags) to make buying lower‑impact items easier. (zalora.sg)
• Carousell — Singapore’s biggest classifieds/recommerce app where you can buy and sell preloved clothing (a major option for circular/secondhand fashion). Carousell also integrated Refash and Ox Street into its recommerce ecosystem. (apps.apple.com)
• Refash — Singapore‑founded thrifting/recommerce platform (now part of the Carousell group) that sells curated secondhand clothing through its app/website and physical stores. (refash.sg)
• Ox Street / Ox Street listings (via Carousell group) — specialises in authenticated sneakers/streetwear resale across SEA. Good for extending product life of high‑value footwear. (press.carousell.com)
• Vestiaire Collective — global pre‑loved luxury marketplace with operations covering Singapore (app for buying/selling authenticated secondhand designer pieces). (expatchoice.asia)
• Depop — international preloved fashion marketplace with an app available in Singapore; large peer‑to‑peer community for secondhand and vintage items. (apps.apple.com)
• Style Theory — Singapore‑based clothing rental/subscription app (wardrobe‑as‑a‑service) that helps reduce consumption by enabling frequent rental of designer/office wear. (styletheoryweb.co)
• H&M (app / online) — carries the “Conscious” / Conscious Exclusive ranges and runs garment‑collection programs; available to shop in Singapore via H&M’s online/app channels. (sg.fashionnetwork.com)
• UNIQLO (app / stores) — runs RE.UNIQLO recycling and sells items made with recycled materials; their app/online store services Singapore customers. (uniqlo.com)

Quick tips for finding eco items in these apps

• Search keywords: “sustainable”, “Earth Edit”, “Conscious”, “pre‑loved”, “preloved”, “secondhand”, “vintage”, “recycled”.
• Use filters (when available) for “pre‑owned”, “sustainable”, “authentic / certified” or look for brand/collection badges. (ZALORA’s Earth Edit is an example of an app filter/curation hub.) (zalora.sg)

If you’d like, I can:

• show a short comparison (price range / typical item types) for 2–3 of these apps, or
• find a few current eco‑friendly brands available on ZALORA or H&M Singapore right now.