★ BEST INVESTING TOOLS COMPARISON ★
VOL. XCIV, NO. 247
Friday, June 12, 2026
Tool Comparison · Friday, June 12, 2026
SEC API (sec-api.io) vs WhaleWisdom
Trying to decide between SEC API (sec-api.io) and WhaleWisdom? Here's how they compare on pricing, features, and platforms — and which one fits the way you invest.
SEC API (sec-api.io)
Best for regulatory filings monitoring and financials
A commercial API suite for SEC/EDGAR data, designed for developers, quants, and compliance teams. The free tier covers the first 100 API calls. Paid tiers unlock all APIs with higher rate limits, annual or monthly billing, and features such as multiple API keys or redistribution rights for enterprise users. The platform emphasizes speed, with new filings typically available in under 300 ms.
WhaleWisdom
Best for institutional data and investor holdings
Aggregates 13F filings, Schedule 13D/G data, Form 4 insider activity, and institutional ownership tools so investors can follow fund positioning, build watchlists/filer groups, export data, and backtest crowding strategies. Free access remains available with limited tools and recent 13F history; the pricing page says there are no trial accounts, while much of the site can be explored for free. Current paid plans are Standard at $90/quarter or $300/year, Pro at $150/quarter or $500/year, and Enterprise by quote for team access, unlimited 13F API access, live data feed calls, and nightly FTP files.
Outbound links may include affiliate or sponsor codes.
The verdict
The bottom line: SEC API (sec-api.io) and WhaleWisdom cover a lot of the same ground — 5 shared categories, including data APIs, insider data, and 13f — so for the basics you won't go far wrong with either. WhaleWisdom simply does more — 12 categories to SEC API (sec-api.io)'s 9, including institutional data, investor holdings, and stock ideas. SEC API (sec-api.io) counters by keeping things simpler.
Key differences at a glance
Free plan
Both
Both have one
Cheaper paid plan
WhaleWisdom
$25/mo vs $55/mo
Broader coverage
WhaleWisdom
12 vs 9 categories
Desktop app
WhaleWisdom
WhaleWisdom only
Real-time data
SEC API (sec-api.io)
SEC API (sec-api.io) only
Choose
SEC API (sec-api.io) if…
- You care about regulatory filings monitoring, financials, and management compensation — things WhaleWisdom doesn't offer
- Delayed quotes won't cut it — you need real-time data
Choose
WhaleWisdom if…
- You want the cheaper way in — plans start at $25/mo instead of $55/mo
- You care about institutional data, investor holdings, and stock ideas — things SEC API (sec-api.io) doesn't offer
- You want more under one roof — 12 categories to SEC API (sec-api.io)'s 9
Consider alternatives if…
- You'd rather have one tool that does it all.
- Neither price feels right for what you'd get.
Comparison snapshot
Standout features
What SEC API (sec-api.io) does best
- Comprehensive API endpoints: query, full-text search, real-time streaming via WebSocket, download/PDF generator, XBRL-to-JSON conversion, and section extractors for 10-K/10-Q/8-K filings.
- Specialized form coverage including ADV, insider filings (Forms 3/4/5), 13F, 13D/G, Form 144, IPO registrations (S-1, 424B4), crowdfunding (Form C, Form D), Reg A filings, and fund reports (N-PORT, N-PX, N-CEN).
- Datasets include executive compensation, directors and board members, audit fees, subsidiaries, and public float/outstanding shares.
- Historical coverage back to 1993 with support for all 400+ EDGAR form types; new filings made available within ~300 ms of posting.
- Live filing feeds available in real time via WebSocket for instant integration.
What WhaleWisdom does best
- Track and analyze hedge-fund and institutional SEC filings including 13F quarterly reports, Schedule 13D/G events, Form 4 insider transactions, Form D, Form 144, N-CEN mutual-fund search, and Investment Adviser/Form ADV search tools.
- Free tier advertises past two years of 13F data, unlimited email alerts, filer groups up to 5 members, stock watchlists up to 5 stocks, backtesting over recent 13F history, and limited access to most site tools.
- 13F database history goes back to the March 31, 2001 quarter / Q1 2001; Standard and Pro unlock earlier historical 13F data, while Standard also lists historical 13D/G data back to 2006.
- Developer API uses the endpoint https://whalewisdom.com/shell/command, requires a registered account and API access keys/signatures or an authenticated browser session, and is limited to 20 requests per minute.
- API commands include quarters, stock_lookup, filer_lookup, stock_comparison, holdings_comparison, export, holdings, holders, and filer_metadata; outputs include HTML, JSON, and CSV depending on command.
Data & access details
| Attribute | SEC API (sec-api.io) | WhaleWisdom |
|---|---|---|
Asset types | StocksETFsMutual FundsFunds | StocksETFsClosed-End FundsBondsOptions |
Experience | BeginnerIntermediateAdvanced | BeginnerIntermediateAdvanced |
Regions | North America | North America |
Data freshness | Real-time | Not specified |
API access | RESTWebSocket | REST |
Export formats | JSONPDF | CSVExcelJSON |
Seen enough? The fastest way to decide is to open both and poke around for five minutes.
Pricing breakdown
Tool
SEC API (sec-api.io)
$55/mo
Starting price
Plans & pricing
Tool
WhaleWisdom
$25/mo
Starting price
Plans & pricing
Coverage overlap
Where the two tools cover the same ground.
What you only get with SEC API (sec-api.io).
What you only get with WhaleWisdom.
Community category leaders
Vote sentiment comparison
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Still deciding? Get hands-on with both — most plans offer a free tier or trial.
Frequently Asked Questions
What's the difference between SEC API (sec-api.io) and WhaleWisdom?
SEC API (sec-api.io) leans toward data APIs, regulatory filings monitoring, and insider data, while WhaleWisdom puts more weight on institutional data, 13f, and 13d/13g. They overlap in 5 categories, so for most people it comes down to workflow preference and price.
How much do SEC API (sec-api.io) and WhaleWisdom cost?
Good news — both SEC API (sec-api.io) and WhaleWisdom have free plans, so you can run them side by side and only pay if you hit a wall.
Do SEC API (sec-api.io) and WhaleWisdom have APIs?
Yes — both offer API access, so developers and quants can pull data programmatically or wire up their own integrations.
Should I choose SEC API (sec-api.io) or WhaleWisdom?
It depends on what you're after. Pick SEC API (sec-api.io) if regulatory filings monitoring and financials matter to you; go with WhaleWisdom if you'd rather have institutional data and investor holdings. And if you only need the basics both share, let price decide.
What asset classes do SEC API (sec-api.io) and WhaleWisdom cover?
Both cover stocks and ETFs. SEC API (sec-api.io) also handles mutual funds and funds. WhaleWisdom adds closed-end funds, bonds, and options on top.
Does SEC API (sec-api.io) or WhaleWisdom have real-time data?
SEC API (sec-api.io) offers real-time data, which matters if you trade actively. WhaleWisdom runs on delayed or end-of-day data — perfectly fine for longer-term investors who don't live and die by the tick.
Can I export data from SEC API (sec-api.io) and WhaleWisdom?
WhaleWisdom exports to CSV, Excel, and JSON. SEC API (sec-api.io) is stingier about getting data out.
Which has a better stock screener—SEC API (sec-api.io) or WhaleWisdom?
WhaleWisdom has a stock screener for surfacing ideas; SEC API (sec-api.io) doesn't, and focuses its energy elsewhere.
Other tools you might like
These profiles share overlapping coverage with both sides of this matchup.
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Curation & Accuracy
This directory blends AI‑assisted discovery with human curation. Entries are reviewed, edited, and organized with the goal of expanding coverage and sharpening quality over time. Your feedback helps steer improvements (because no single human can capture everything all at once).
Details change. Pricing, features, and availability may be incomplete or out of date. Treat listings as a starting point and verify on the provider’s site before making decisions. If you spot an error or a gap, send a quick note and I’ll adjust.