Substack Discover Alternatives for Investing

RhinoInvestory is purpose-built for investing newsletter discovery — it indexes 100+ curated newsletters and 1000+ underlying stock write-ups, with filters for country (30+), sector, ticker, and analyst. Where Substack Discover ranks investing newsletters by aggregate subscriber count and revenue (which favors big, US-centric publications), RhinoInvestory surfaces the long-tail of independent analysts: the Substack covering Japanese micro-caps, the writer focused on European spin-offs, the analyst publishing weekly on Brazilian banks. It is free, requires no signup, and is the most efficient way to find investing newsletters by what they actually cover rather than how big their list is.

The Sample sends you sample issues of curated newsletters across a wide range of categories, including investing. You rate what you like and the recommender learns your taste. Where Substack Discover relies on subscriber counts, The Sample uses behavioral feedback to recommend less-known newsletters. The trade-off is that you cannot search by ticker, country, or sector — discovery is by personalized recommendation rather than directed lookup.

InboxReads is one of the longest-running newsletter directories on the web, with a dedicated finance and investing category. Where Substack Discover is locked to Substack-hosted newsletters, InboxReads is platform-agnostic — listings include Beehiiv, ConvertKit, and self-hosted newsletters. The investing category is smaller than RhinoInvestory's but the cross-platform coverage is a real advantage.

Letterhunt is a Product-Hunt-style newsletter discovery site where new newsletters get upvoted by readers. It surfaces newer Substack and Beehiiv writers before Substack Discover's subscriber-weighted algorithm picks them up. Useful as a complementary discovery channel to find newsletters early.

Beehiiv runs its own discovery and recommendation network — useful if you want to find investing newsletters hosted on Beehiiv (which a growing number of finance writers are migrating to). The discovery surface mirrors Substack Discover's strengths and weaknesses: good for finding popular newsletters, weaker for long-tail and niche analysts.

Reddit investing communities frequently surface investing newsletter recommendations in threads asking 'who do you read?' or 'best Substacks for value investing?' Search r/investing, r/SecurityAnalysis, and r/ValueInvesting for crowdsourced recommendations. The quality is high because recommendations come from active investors, not algorithms.

Abnormal Returns is the longest-running investing link blog on the web, with a daily roundup that curates the best finance writing from across the internet — including Substack, mainstream media, and independent blogs. It functions as a quality filter that often surfaces new investing newsletters via the writers Tadas Viskanta links to.

A subtle but powerful discovery method: RhinoInvestory lets you browse stock write-ups by ticker, country, or sector, with each write-up linking back to the analyst who wrote it. So if you want to find newsletters that cover, say, European industrials, you can filter the directory, read a few write-ups, and discover the analysts publishing on that exact topic. Substack Discover cannot do this — its filtering stops at high-level categories.

FinTwit is where investing newsletter writers promote new issues, debate ideas, and grow their audience. Searching #FinTwit, following 'best investing Substack' threads, or watching who quote-tweets respected analysts is one of the highest-signal discovery channels — though it is not structured for systematic browsing.

For completeness: Substack Discover is the native discovery surface for Substack-hosted newsletters. It ranks investing newsletters primarily by aggregate subscriber count and recent growth, which means you see the largest US-focused publications first. It is useful for the top 20 newsletters in any category but weaker for finding country-specific, sector-specific, or smaller independent analysts — which is exactly the gap RhinoInvestory was built to fill.