Nostra vs Polywhaler: which Polymarket tracker fits you?
Both help you follow smart money on Polymarket. Polywhaler is a research platform for whale trades on Polymarket and Kalshi. Nostra is an iPhone app that scores traders and alerts you when the ones you follow make a move.
Short answer
Pick Polywhaler if you want a full research desk: a live feed of whale trades on Polymarket and Kalshi, insider flags, Telegram or Discord alerts and copy trading. Pick Nostra if you want a simple iPhone app that picks skilled traders for you and alerts you when they move, without connecting an account or placing trades.
Nostra
iPhone appFollow Polymarket’s best traders, hands-off.
Best if
- You want ready-made lists of skilled traders, not a feed to watch
- You want push alerts on your iPhone without setting up rules
- You want a tool that never trades or touches your account
Polywhaler
Web and iPhoneLive whale tracking and research for Polymarket and Kalshi.
Best if
- You want to see every big trade as it happens
- You want alerts in Telegram or Discord, or insider-risk flags
- You want to backtest or copy a whale’s trades
Side by side
Polywhaler details come from its public website on 2 Nov 2026. Tell us if something has changed.
Where Nostra is different
Nostra is built to be hands-off. Smart groups pick traders for you by a fixed rule and update themselves, monthly or weekly, so you don’t have to research wallets to get started.
You follow people or groups and get a push alert when they open or close a position. There’s no feed to watch, no rules to set up, and Nostra never places trades or asks you to connect an account.
Where Polywhaler is stronger
Polywhaler does a lot more: a live feed of large trades on Polymarket and Kalshi, insider-risk scores, charts, a world map and an AI agent for research. If you want to backtest or copy a whale’s trades, its Orca tool does that, which Nostra deliberately doesn’t.
It also works in any browser, and Nostra is iPhone only for now.
Questions
Is Nostra free?
Nostra is free to download. Full access comes with Nostra Pro, a subscription you can cancel any time.
Can I use both?
Yes. Some people research on Polywhaler’s web app and use Nostra for alerts on the traders they trust.
Does either place trades for me?
Nostra doesn’t: it is read-only and never holds money. Polywhaler’s Orca tool can paper trade, copy whales and place live trades if you connect an account.
Keep exploring
More from Nostra: rankings by topic, trader profiles, smart groups and plain-English guides.
Leaderboards by topic
Top traders in Politics, Sports, Crypto and 7 more topics, re-scored every week.
Top traders
Profiles for the 500 best-scored Polymarket traders, with stats and recent calls.
Smart groups
20 self-updating groups, from The Nostra 30 to Weather Wizards.
Smart money
Markets where 3 or more top-scored traders back the same side, checked every 6 hours.
How the score works
What goes into a Nostra score, how often it updates and where it falls short.
Guides
Plain-English guides to finding and following traders on Polymarket.
Nostra for iPhone
Follow Polymarket’s best traders, hands-off
Nostra scores about 1,750 traders every week, groups the best into 20 smart groups and alerts you when they trade.
Free to download · iPhone