HammerA trading journal that's private by default.
Log a crypto or forex trade in 15 seconds on your iPhone. Review it on your Mac. Free and local-only forever. Pro tells you why you win — everywhere you trade, for the price of a coffee.
On the App Store for iPhone, iPad and Mac — fully local-only, no account needed. Rather skip the App Store on your Mac? Download it directly. Saving your own trades on the web needs an account; that's the only way to keep them and get them back.The product
See what it tells you
Everything below is the real product, running on a sample book of 191 trades.
Insights
Where your money actually goes
Hammer compares your trades against each other and tells you, in plain words, what's costing you and what's working — ranked by money, with the trades behind every finding.
- Revenge trades, overtrading, losers held too long
- Which setups, hours and markets actually pay
- What your moods and broken rules cost you
Weekly review
Your week, in words
Every week Hammer writes up how you traded: the numbers, the one pattern worth your attention, what's working, and one thing to try next week. On iPhone and Mac it's written on-device — your trades never leave it.
iPhone, iPad and Mac
Log it on your phone. Review it on your Mac.
A real app, not a website in a wrapper: log a trade in 15 seconds while it's fresh, then review the week on the big screen. Free keeps everything on your device; Pro syncs one journal to every device and the web.
Try it with your trades
Free journals show your win rate. Hammer shows you why.
Drop in your exchange's trade history and see what's costing you — revenge trades, overtrading, cutting winners short — before you sign up for anything.
Why we built this
“Most journals just collect data. They don't interpret it. A journal should answer: where am I leaking edge? Not just: what was my win rate?”
— r/DaytradingEvery other trading journal shows you more charts. Hammer reads your own trades and tells you, in plain language, what's costing you and what's working — ranked by money, not buried in a report you have to build yourself.
Two things nobody else in this market does.
It tells you why
Not just a win rate — findings ranked by money: “Breaking your rules cost you −$412 across 9 trades.” With the trades behind each one.
Private by default — even the AI
On iPhone, iPad and Mac, Free never touches a server — your journal stays on the device, and the written review runs on-device too. The web app stores your journal under your account instead, scoped to you with row-level security and never used to train a model.
Free is free, and offline
Unlimited trades, full metrics, calendar and export — on one device, forever. No trial, no trade cap, no nagging to upgrade.
One journal, every device
Pro syncs the same journal to iPhone, iPad, Mac and the web — log on your phone between trades, review on your Mac at night.
Funding fees, done right
Perp funding accrues every 8 hours and quietly eats returns. Hammer tracks it as its own line, not lumped into “fees” like everywhere else.
Built for crypto and forex
Spot, perps, futures and FX lots — average entries, partial exits and leverage handled at the execution level, not guessed at.
Your journal is scoped to you. Full stop.
The native apps are local-first: Free never creates an account, and nothing leaves the device — not even for the AI. A browser has no private on-device database the way a phone does, so the web app needs somewhere to keep your journal so you can find it again — it lives in your account instead, encrypted at rest and scoped so only you can query it through the API. We say so plainly rather than overclaim: technically, our own team could look at synced data the way any hosted service's operators can. We just don't, except to fix a problem you've asked us to fix.
- Native apps: no account, nothing leaves the device — ever.
- Web: your account, your rows — scoped by row-level security, encrypted at rest.
- Never sold, never used to train a model. The written review is opt-in and disclosed before anything is sent.
Free forever. Pro when you want to know why.
No trade cap on free. Pro is Insights, the written weekly review, and one journal across your devices — $9.99/mo or $79.99/yr.
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