Martian Alpha vs SpaceNexus: Space Research Compared

Martian Alpha is a research terminal for the space economy: space stocks, launches, contracts, filings and private space companies in one place, free to start. SpaceNexus (spacenexus.us) is a broader space-industry platform covering news, launches, company profiles, jobs, markets and a contracts section. They overlap, but they are built around different people: Martian Alpha is built around the investor's question ("which stock does this launch, contract or filing move?"), SpaceNexus around the whole industry. We make Martian Alpha, so weigh this comparison with that in mind; every SpaceNexus statement below comes from its own homepage as read on October 28, 2026. Not financial advice.

At a glance#

Where Martian Alpha is the better fit#

• You hold or follow space stocks. Each company page puts the launch history, key stats and cash runway for that ticker together, and the catalyst feed lists dated events by company. See how to research space stocks for the full filing-by-filing method.
• You want to know what launches do to a stock. The Space Ledger has logged launch-date changes and the price reaction since October 5, 2026 (222 events and 3,604 daily data points when I checked on October 28). It is young, so treat it as a growing record, not a long backtest. Our write-up of the method is in space stock reaction to launches.
• You follow contracts and private raises next to the listed names. Contract awards and the private company directory sit beside the public companies they compete with. How to read the underlying filings: Form D for private space companies and space contract awards on USAspending.

Where SpaceNexus is the better fit#

• You work in the industry, not only in markets. Its homepage lists a jobs board, company rankings, an orbital data centre tracker, a podcast directory and newsletters, none of which Martian Alpha offers.
• You want news and media in one place. It runs a news feed, a daily video and email newsletters.
• You want downloadable datasets. It lists free datasets (companies, rounds, launch log, slips) as CSV or JSON, described as free with attribution and no account.

Which one for which job#

Many people will reasonably use both. Neither replaces the primary sources, which is why our posts link to filings and agency records.

FAQ#

Is Martian Alpha free?#

There is a free plan with the dashboard, screener, launch calendar, catalyst feed, company pages and watchlist alerts for a limited number of tickers, no card needed. Paid plans start at $5 a month.

What is the best website for space economy research?#

It depends on the job. For researching space stocks together with launches, contracts, filings and private companies, Martian Alpha is built for exactly that. For industry news, jobs and broader directories, SpaceNexus covers more ground. Use the table above.

Does Martian Alpha replace SEC filings?#

No. It points to filings and agency records so you can check the source. Read the 10-Q or contract notice before relying on any summary, ours included.

Where can I see what is overhead right now?#

Both offer a what's overhead view. Martian Alpha's is open at /overhead.

Martian Alpha section#

The launch calendar ties each launch to the listed company behind it, and the catalyst feed lists dated events by ticker. Both are open to read; a free account lets you save a watchlist with alerts: create one here.

Sources#

• SpaceNexus homepage, https://spacenexus.us/ (read October 28, 2026). Its pricing page did not render its plan details for us, so we state no SpaceNexus price.
• Martian Alpha Space Ledger summary (222 events, 3,604 daily points, recording since 2026-10-05), checked October 28, 2026.
• SEC EDGAR: https://www.sec.gov/edgar/search/