The best apps similar to Kalshi for US traders — from Polymarket to Rebet to OG — compared on legality, fees, and mobile experience.
Polymarket is the closest comparable app — CFTC-licensed and available in 49 US states + DC on iOS (iPhone only). Kalshi traded more volume in July 2026 ($41.1B vs $8.6B), so compare liquidity market by market.
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Kalshi's appeal is simple: a CFTC-regulated US exchange with a polished mobile app and real USD via ACH. The apps below offer a similar binary-contract experience with different trade-offs on liquidity, currency, and state availability.
Polymarket is the most directly comparable app to Kalshi. It's also CFTC-licensed, traded about $8.6B in July 2026 versus Kalshi's $41.1B, and runs in 49 US states + DC via its iOS app. The main difference: Polymarket's global platform settles in USDC, while its US app funds by debit card or ACH. See the Polymarket review.
Rebet is the most mobile-first option on this list. It runs as a sweepstakes app (Sweep Coins redeemable for cash) in 39 states + DC and leans heavily on sports markets. Cleaner onboarding than Kalshi for casual users.
Backed by Crypto.com, OG is available in 41 states + DC and funded directly from your Crypto.com balance. Strongest if you already hold crypto. Full review.
PredictIt operates under a narrow CFTC no-action letter, only for political contracts, with an $850 cap per market. Niche but legitimate.
Manifold uses 'Mana' — play money you can't cash out. Useful as a learning sandbox; not a real-money Kalshi alternative.
Robinhood launched a limited menu of CFTC-listed event contracts in 2025 (Fed decisions, major sports). The selection is narrower than Kalshi's, but for existing Robinhood users it's a low-friction way in.
Polymarket is the closest comparable app — CFTC-licensed and available in 49 US states + DC on iOS (iPhone only). Kalshi traded more volume in July 2026 ($41.1B vs $8.6B), so compare liquidity market by market.
Yes — Kalshi has both iOS and Android apps. Polymarket's US product is iOS-only, plus the global web platform.
Polymarket (USDC on Polygon) and OG by Crypto.com both fund via crypto. Kalshi itself takes only USD via ACH or card.
Polymarket — no per-trade fee, roughly 0.5–1% effective via the bid/ask spread on liquid markets. Kalshi charges 5–7% on profits.
Yes — both are legal and many serious traders use both: Kalshi for ACH-funded US macro/political plays, Polymarket for size and global coverage.
Catie has spent 15 years covering iGaming, sports betting, and now prediction markets — first as a trade reporter, later as head of editorial at two major industry publications. She has tested every regulated US event exchange since Kalshi's 2021 launch and writes the bulk of PredictionWins' platform reviews and tax explainers.
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