Sereo: Stock & Options Journal
Contains adsIn-app purchases
Everyone
info
100+
Downloads
About this app
Sereo is a calm, offline-first trading journal for stock and options traders. Log every trade in seconds, see instantly whether it worked, and build the discipline that separates consistent traders from the rest.
No account. No cloud. No subscription. Your journal lives on your device.
WHY TRADERS PICK SEREO
• Works offline — your trading journal opens instantly, on a plane or in the subway.
• 100% private: no login, no sign-up, no server. Your trades never leave your phone.
• One-time purchase for Pro. No subscription, ever.
• Built for stocks and US equity options — not a forex app with stocks bolted on.
STOCK & OPTIONS JOURNAL IN ONE
• Add a trade in three fields: symbol, quantity, price.
• Log stock trades and US equity options side by side — long calls and puts, vertical spreads, covered calls, cash-secured puts.
• Average in, scale out or close: the position, cost basis and P&L update themselves.
• Trading at more than one broker? Keep every position in a single journal instead of jumping between broker apps.
• Company logos, filters, sort and search across your whole trade history.
• Open positions stand out, so you always see what is still live.
KNOW YOUR REAL PERFORMANCE
• Realized and unrealized P&L, win rate, profit factor, expectancy, average R.
• An equity curve and a P&L calendar that show your progress at a glance.
• Breakdowns by symbol, weekday, direction and instrument type (Pro).
SEREO COACH — LEARNS FROM YOUR OWN TRADES (Pro)
• An on-device trading coach built from your own closed trades. It mirrors your statistics; it never predicts the market.
• Checks every new entry against your history: oversized position, missing stop, risk/reward below your own break-even, averaging into a loser, jumping back in right after a loss.
• Finds the patterns that cost you money: weekdays that do not work for you, winners cut too early, losers held too long.
• Honest by design: every insight shows the trades it is based on, and the coach stays quiet while your data is not conclusive yet.
13 BUILT-IN CALCULATORS
• Stocks & risk: position size, risk/reward, average down/up, reverse average, compound growth, loss recovery, Kelly criterion, what-if P&L, FX impact.
• Options: payoff charts, vertical spreads, Black-Scholes greeks, expected move.
• Every result is explained, so you can judge a trade before you take it.
TAX REPORT WITHOUT THE SPREADSHEET
• A FIFO report for the tax year: gains, losses, net result and an estimated tax at the rate you set.
• Cost basis tracked per lot, so partial closes are never a guess.
• Export to CSV for your accountant. Import CSV to restore your history.
MULTI-CURRENCY DONE RIGHT
• Trading in more than one currency? Foreign fills are converted at their own FX rate, so your P&L is never a mix of currencies.
• An FX impact calculator splits your result into the price move and the currency move.
MARKET CONTEXT
Optional — bring your own free Finnhub key.
• Live prices for open positions and your watchlist.
• Company news and the earnings calendar for the tickers you follow.
• Analyst buy/hold/sell consensus and price targets (Pro).
FREE AND PRO
Sereo is free to use and supported by ads. A single one-time purchase unlocks Pro: Sereo Coach, deeper analytics, analyst data and an ad-free journal.
No subscription, no account, ever.
Sereo is a journal and analysis tool, not investment advice. Tax figures are estimates — confirm them with a professional.
No account. No cloud. No subscription. Your journal lives on your device.
WHY TRADERS PICK SEREO
• Works offline — your trading journal opens instantly, on a plane or in the subway.
• 100% private: no login, no sign-up, no server. Your trades never leave your phone.
• One-time purchase for Pro. No subscription, ever.
• Built for stocks and US equity options — not a forex app with stocks bolted on.
STOCK & OPTIONS JOURNAL IN ONE
• Add a trade in three fields: symbol, quantity, price.
• Log stock trades and US equity options side by side — long calls and puts, vertical spreads, covered calls, cash-secured puts.
• Average in, scale out or close: the position, cost basis and P&L update themselves.
• Trading at more than one broker? Keep every position in a single journal instead of jumping between broker apps.
• Company logos, filters, sort and search across your whole trade history.
• Open positions stand out, so you always see what is still live.
KNOW YOUR REAL PERFORMANCE
• Realized and unrealized P&L, win rate, profit factor, expectancy, average R.
• An equity curve and a P&L calendar that show your progress at a glance.
• Breakdowns by symbol, weekday, direction and instrument type (Pro).
SEREO COACH — LEARNS FROM YOUR OWN TRADES (Pro)
• An on-device trading coach built from your own closed trades. It mirrors your statistics; it never predicts the market.
• Checks every new entry against your history: oversized position, missing stop, risk/reward below your own break-even, averaging into a loser, jumping back in right after a loss.
• Finds the patterns that cost you money: weekdays that do not work for you, winners cut too early, losers held too long.
• Honest by design: every insight shows the trades it is based on, and the coach stays quiet while your data is not conclusive yet.
13 BUILT-IN CALCULATORS
• Stocks & risk: position size, risk/reward, average down/up, reverse average, compound growth, loss recovery, Kelly criterion, what-if P&L, FX impact.
• Options: payoff charts, vertical spreads, Black-Scholes greeks, expected move.
• Every result is explained, so you can judge a trade before you take it.
TAX REPORT WITHOUT THE SPREADSHEET
• A FIFO report for the tax year: gains, losses, net result and an estimated tax at the rate you set.
• Cost basis tracked per lot, so partial closes are never a guess.
• Export to CSV for your accountant. Import CSV to restore your history.
MULTI-CURRENCY DONE RIGHT
• Trading in more than one currency? Foreign fills are converted at their own FX rate, so your P&L is never a mix of currencies.
• An FX impact calculator splits your result into the price move and the currency move.
MARKET CONTEXT
Optional — bring your own free Finnhub key.
• Live prices for open positions and your watchlist.
• Company news and the earnings calendar for the tickers you follow.
• Analyst buy/hold/sell consensus and price targets (Pro).
FREE AND PRO
Sereo is free to use and supported by ads. A single one-time purchase unlocks Pro: Sereo Coach, deeper analytics, analyst data and an ad-free journal.
No subscription, no account, ever.
Sereo is a journal and analysis tool, not investment advice. Tax figures are estimates — confirm them with a professional.
Offline journal for stock & options trades. P&L, tax report, no subscription.
Updated on
Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
What’s new
Initial release of Sereo.
• Track and review your trades
• Analyze performance and trading habits
• Manage your watchlist
• Access market insights
• Improved stability and performance
• Track and review your trades
• Analyze performance and trading habits
• Manage your watchlist
• Access market insights
• Improved stability and performance
App support
About the developer
MATEUSZ KOZŁOWSKI MITYSOFT
mattkozlowski0@gmail.com
Ul. Jana III Sobieskiego 14d-1
05-083 Wierzbin
Poland
+48 883 976 326
