Editor's pick

Prediction market apps compared: Kalshi, Polymarket & alternatives (2026)

Kalshi and Polymarket give you the markets, but neither gives you the discipline: a watchlist, the EV math, and an honest record of whether your edge is real. These five apps are the companion tools that sit beside your trading account rather than inside it. Sidemarket builds a cross-platform watchlist with open EV and Kelly math plus a base-rate library; Linevigil tracks the gap where sportsbook lines and Kalshi odds disagree; Wagerlog journals every wager across platforms and computes CLV and true ROI; Brierboard runs friendly Brier-scored forecasting tournaments with friends; and Forecastly trains your personal calibration curve so you learn when your gut is actually right. None place trades or touch your money, so your positions and history stay on your own device.

  1. Sidemarket icon
    TestFlight beta Finance

    Sidemarket

    A calm watchlist for prediction markets. Bring your own EV.

    Does:
    prediction market tracker
    Price:
    Free, no subscription
    Offline:
    Yes
    Account:
    None

    Read the full app page →
  2. Linevigil icon
    TestFlight beta Sports

    Linevigil

    Where the books and Kalshi disagree. Watch the gap.

    Does:
    sportsbook vs Kalshi odds tracker
    Price:
    Free, no subscription
    Offline:
    No
    Account:
    None

    Read the full app page →
  3. Wagerlog icon
    TestFlight beta Finance

    Wagerlog

    Every bet, one journal. CLV and EV, no spreadsheet.

    Does:
    sports bet tracker
    Price:
    Free, no subscription
    Offline:
    Yes
    Account:
    None

    Read the full app page →
  4. Brierboard icon
    TestFlight beta Social Networking

    Brierboard

    Forecasting tournaments with your friends.

    Does:
    forecasting tournament
    Price:
    Free, no subscription
    Offline:
    No
    Account:
    None

    Read the full app page →
  5. Forecastly icon
    TestFlight beta Productivity

    Forecastly

    A personal calibration journal. Get better at being right.

    Does:
    calibration journal
    Price:
    Free, no subscription
    Offline:
    Yes
    Account:
    None

    Read the full app page →
  6. Foresight icon
    In App Review Games

    Foresight

    Forecast real events. Sharpen your foresight.

    Does:
    play-money prediction market game
    Price:
    Free, no subscription
    Offline:
    No
    Account:
    None

    Read the full app page →
  7. Newsedge icon
    TestFlight beta News

    Newsedge

    Read a story. See the markets that move.

    Does:
    news-to-prediction-market lookup
    Price:
    Free, no subscription
    Offline:
    No
    Account:
    None

    Read the full app page →

FAQ

Do these apps place trades on Kalshi or Polymarket? ▾

No. None of them connect to your trading account, place orders, or handle real money. Sidemarket and Linevigil are watchlists and decision tools, Wagerlog is a journal, and Brierboard and Forecastly are forecasting and calibration tools. You still trade on Kalshi or Polymarket directly; these apps help you decide and keep score.

Is my trading data kept private? ▾

Yes. Because these apps don't link to your brokerage account or broadcast your positions, your watchlists, trade journal, and forecasting history stay on your own device. Sidemarket explicitly doesn't connect to your account or broadcast your positions, and Wagerlog is a single private journal with no bookmaker integration.

What's the difference between Sidemarket, Wagerlog, and Forecastly? ▾

Sidemarket is a forward-looking watchlist and EV/Kelly calculator for markets you're considering on Kalshi and Polymarket. Wagerlog is a backward-looking journal that logs every wager across platforms and computes EV, closing line value, and ROI by book and sport. Forecastly isn't about money at all; it's a calibration journal that scores your predictions with Brier scores and plots where your confidence drifts from reality.

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