Never miss what matters in your newsletters

StackDigest creates personalized, AI-powered summaries of your newsletter subscriptions. Get insights without inbox overwhelm.

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The newsletter paradox

You subscribed because the content was incredible. Now your inbox is a graveyard of good intentions.

12
Monday newsletters
You save them "for later"
8
Wednesday additions
The guilt builds
0
Friday reads
Newsletter bankruptcy
1
Sunday regret
You missed that article

The average Substack reader subscribes to 20+ newsletters but reads less than 3 per week.

Everything you need to stay informed

Powerful features that transform your newsletter experience

Newsletter discovery

Find and add the best Substack newsletters to your library with keyword and author search options

Custom article scoring

Adjust scoring criteria to prioritize articles based on engagement, length, and more. (Additional scoring models coming soon.)

Keyword filtering

Filter articles by keywords to create focused digests on topics that matter to you

AI-powered summaries

Get concise, intelligent summaries of long articles without losing key insights

Smart organization

Automatically categorize and organize newsletters by topic and relevance

One-click import

Import from your Substack settings page with our browser bookmarklet

Three powerful new features

Discover newsletters, customize scoring, and filter by keywords

1. Newsletter discovery

Find and add the best newsletters to your library instantly

Newsletter Discovery Filters

Search newsletters by topic

Newsletter Discovery Search

Preview recent articles

2. Custom article scoring model

Adjust weights for engagement and length to surface articles that matter to you

Custom Article Scoring

3. Keyword filtering

Create focused digests by filtering articles that contain your specified keywords

Keyword Filtering
Karen Spinner
Karen Spinner

Founder, StackDigest

Why I built StackDigest

"When I joined Substack two months ago, I subscribed to every interesting newsletter I stumbled onto.

I ended up with 200+ subscriptions. I was overwhelmed with notifications, but I didn't want to unsubscribe.

I built StackDigest so I could keep up with my reading and surface high-value articles. Now you can too."

Email me DM on Substack

How StackDigest works

Get started in minutes, not hours

1
Add your newsletters

Paste URLs or use our bookmarklet to retrieve newsletters from Substack

2
Configure your preferences

Set digest frequency, choose topics, and customize summary style

3
Receive your digest

Get beautifully formatted summaries on demand

Enter a world where information overload is a forgotten nightmare. Karen Spinner's StackDigest summarizes all of your newsletters into a single, organized digest. Reclaim your time and master your mountain of content. Absorb the wisdom of hundreds of newsletters in the time it takes to sip your morning coffee.

Old Man Talks
OT - Old Man Talks
@oldmantalks • Substack

Frequently asked questions

Everything you need to know about StackDigest

StackDigest automatically collects all your newsletter subscriptions and creates personalized, AI-powered digests on demand. Instead of facing an overwhelming inbox, you get a single, organized summary that highlights the most important articles with concise summaries, while still listing everything else so you don't miss anything. Think of it as your personal newsletter assistant that reads everything and tells you what matters most.

StackDigest is currently free during the beta period. I'm focusing on getting feedback from early users and refining the product before determining pricing. Beta users will get special consideration if/when I do introduce pricing.

There's currently no hard limit on the number of newsletters you can add. I personally tested it with 200+ subscriptions, and some beta testers have even more. The processing time increases with more newsletters, but the system handles larger collections well.

StackDigest uses the Claude family of models from Anthropic to generate article summaries and categorize content. I chose Claude because it can create concise, accurate summaries in a straightforward writing style. The specific model used can vary based on the task (faster models for categorization, more powerful ones for complex summaries).

No, your content is not used to train AI models when processed by StackDigest. Anthropic has confirmed that they do not use API inputs and outputs to train Claude. This means that when StackDigest sends newsletter content to Claude for summarization, that content is not "copied" or harvested for AI training purposes.

However, be aware that Substack offers no way to turn off or limit RSS feeds for free posts. This means that while StackDigest itself doesn't contribute to AI training, your public RSS feeds can still be scraped by LLMs in the wild. If you want to avoid this broader scraping, your options include paywalling your posts or moving your content to a website where you control RSS access.

Yes! You can adjust how many articles get AI summaries (the default is 7) and set the time period for your digest (daily or weekly). I'm working on more customization options, including the ability to prioritize certain topics or newsletters.

Currently, StackDigest is optimized for Substack newsletters, but testing shows that it can work with some RSS feeds with URLs ending with the extension /feed. Full RSS support for any content source is on the roadmap.

You have three options: add individual newsletter URLs, bulk import a list, or use a bookmarklet to grab your subscriptions from your Substack settings page.

Right now, digests are viewable in the app and you can copy the HTML. Email delivery and multiple export formats are on the roadmap.

Yes. Your newsletter subscriptions and digest history are tied to your account and stored securely. I don't share or sell any user data. The only external service that processes your content is Claude's API for summarization, and as mentioned above, Anthropic doesn't use this data for training.

Absolutely! In fact, there's an excellent tutorial by Peter Yang that shows how to use n8n to extract newsletters from Gmail and create weekly summaries. When I was researching solutions for newsletter overload, several people mentioned they were building their own versions using n8n or similar automation tools.

I chose to build StackDigest as a dedicated tool because I wanted something that could handle 200+ subscriptions efficiently, provide real-time processing updates, and offer features specifically designed for newsletter readers. But if you're comfortable with automation tools and want full control over your digest process, n8n is a great DIY option.

I'd love to hear from you! You can reach me directly through my Substack DMs, email me at karen@stackdigest.io, or by replying to any of my Substack posts about StackDigest. I'm building this in public and actively incorporating user feedback into the development process.

StackDigest is designed specifically to help you keep up with all your Substack newsletter subscriptions. Instead of letting newsletters pile up in your inbox, our AI-powered system automatically collects your subscriptions, identifies the most important articles, and creates personalized digests. You can run daily or weekly digests, filter by topics using keywords, and even discover new newsletters in your areas of interest. It's the perfect solution for staying informed without feeling overwhelmed.

StackDigest provides a centralized dashboard to manage all your Substack subscriptions in one place. You can organize newsletters into collections, assign categories, adjust scoring preferences, and control which newsletters appear in your digests. The browser bookmarklet makes it easy to import all your existing subscriptions directly from your Substack settings page, and you can add new newsletters anytime through URL import or our discovery feature.

StackDigest is perfect if you've turned off email notifications to reduce inbox clutter. We pull articles directly from RSS feeds, so you don't need email notifications enabled. You can generate digests on-demand through our web interface, ensuring you stay updated with your favorite newsletters without any emails. This approach gives you complete control over when and how you consume your newsletter content, without missing important articles.

If you're overwhelmed by too many Substack subscriptions, StackDigest is your solution. Rather than unsubscribing from valuable newsletters, use our AI-powered summarization to get the best content from all your subscriptions in one digestible format. You can filter by keywords to focus on specific topics, adjust article scoring to prioritize what matters most, and organize newsletters into collections. This way, you maintain access to all your subscriptions while actually reading the content that's most relevant to you.

StackDigest is built for people who subscribe to many newsletters; I personally tested it with 400+ subscriptions! It's designed to help readers manage large collections efficiently by using smart article scoring to surface the most engaging content, AI summaries to condense long reads, and keyword filtering to focus on your interests. You can create different collections for different topics and generate separate digests for each.

Coming soon

Features we're building next

Custom categories

Create your own categories and organize newsletters your way

Reading list creation

Save and organize articles for later reading and custom digest creation

Beehiiv support

Full support for Beehiiv newsletters alongside Substack

On the roadmap

Support for any RSS feed

Aggregate content from any source, not just newsletters

Email delivery

Get your digests delivered directly to your inbox

Custom digest themes

Choose from different visual styles for your digests

Support for multiple lengths and formats

Choose the digest style that works best for you

StackDigest Format Example StackDigest Format Example

Are you a newsletter publisher?

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Learn about publisher features

Start reading smarter today

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