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Buy Airtight — Private Portfolio Tracker
Your portfolio data never leaves your browser.
A single HTML file that tracks your entire portfolio — crypto, stocks, ETFs — from CSV exports. No account. No cloud. No API keys. FIFO cost basis, live prices, holdings dashboard. Your financial data never leaves your machine. $29 once, not a subscription.
I built Airtight because I was tired of giving my entire trading history to startups that promise not to leak it — and then leak it anyway.
Every portfolio tracker wants your email, your exchange API keys, your transaction history. Kubera charges $150/yr. Delta Pro charges $60/yr. CoinStats $48–120/yr. All of them upload your data to their servers.
Airtight is the opposite of that. It's a single HTML file. You double-click it. You drop in your CSV exports from Binance, Coinbase, Kraken, Revolut, or any exchange. Your portfolio appears instantly — all calculated locally in your browser.
**Here's the part I want you to verify yourself:** Open DevTools → Network tab. Import a file. Watch zero requests leave your machine. The only network calls are live price fetches — and even those happen directly from your browser, never through a server. There is no server.
Technical decisions I made that some people will disagree with:
- **No mobile app.** It's a file. It works in any browser including mobile. I'm not building an iOS app that phones home with your data.
- **CSV exports, not API keys.** API keys are a security nightmare — one leak and someone drains your account. CSV exports are read-only and every exchange does them.
- **No SaaS.** You download a file. You own it. I don't get to shut it down, change the pricing, or add tracking in an update. You can freeze any version.
- **$49 one-time.** (20 dollars discount when paying with crypto). Not a subscription. I update it, you redownload it.
What it handles: 8+ exchange formats (Binance, Coinbase, Kraken, Revolut, Gate.io, Bybit, KuCoin, Hyperliquid) plus a generic parser for anything that looks like a CSV. Excel files too. FIFO cost basis. Holdings dashboard. P&L. Charts. Dark theme.
What it doesn't handle: futures (coming), tax reports (maybe), and your Coinbase login (intentionally).
I genuinely want feedback — especially if an exchange CSV doesn't parse. Send it to me (sanitized) and I'll add a parser within 24 hours. That's the advantage of being a solo dev: I can ship fixes faster than any funded startup.
— Ermis
About Buy Airtight — Private Portfolio Tracker on Product Hunt
“Your portfolio data never leaves your browser. ”
Buy Airtight — Private Portfolio Tracker was submitted on Product Hunt and earned 0 upvotes and 1 comments, placing #41 on the daily leaderboard. A single HTML file that tracks your entire portfolio — crypto, stocks, ETFs — from CSV exports. No account. No cloud. No API keys. FIFO cost basis, live prices, holdings dashboard. Your financial data never leaves your machine. $29 once, not a subscription.
On the analytics side, Buy Airtight — Private Portfolio Tracker competes within Investing, Privacy and Cryptocurrency — topics that collectively have 43.4k followers on Product Hunt. The dashboard above tracks how Buy Airtight — Private Portfolio Tracker performed against the three products that launched closest to it on the same day.
Who hunted Buy Airtight — Private Portfolio Tracker?
Buy Airtight — Private Portfolio Tracker was hunted by AirTight. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of Buy Airtight — Private Portfolio Tracker including community comment highlights and product details, visit the product overview.
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