How Rythm actually works
A step-through of the architecture.
The Library is the complete content index. Every long-form field note, every comparison, every plain-English explainer, every founder note. The five pillar guides at the top are the shortest path through the catalog, curated by intent: basics, phishing, spam, setup, migration. Below the pillars, posts are grouped by category in the order Rythm thinks about them.
Categories follow the schema in the underlying blog: email protection, email overload, inbox psychology, comparisons, use cases, building in public, open protocols. Each post lives in one category and carries its own tags. Use the filter row to narrow by tag if you are looking for something specific.
Building in Public
Non-custodial architecture
A founder note on what it took.
Why we chose deterministic filtering
The decision tree behind the dual-layer filter.
Rules, not guesses
On probabilistic vs deterministic systems.
The big day
A founder note from launch day.
Technical evaluation guide
For IT and security reviewers.
Rythm is not a cryptocurrency service
On the difference between using rails and being a payment provider.
Comparisons
Rythm vs Hey.com
Screener idea without the @hey.com migration.
Rythm vs SaneBox
Deterministic gate vs probabilistic AI sort.
Rythm vs SaneBox 2026
An updated 2026 comparison.
Rythm vs Microsoft Defender 365
The lighter layer next to the enterprise Defender stack.
How Rythm fits the email-protection landscape
Where deterministic gating sits next to alternatives.
Email paywall vs spam filter
Two shapes that answer different questions.
Cover charge vs spam tax
Two terms that sound similar and mean different things.
Email Overload
Why am I getting so much spam?
A short answer that gets longer the more you ask.
How to stop cold emails
The difference between blocking and gating.
Spam vs cold outreach
Why your filter mislabels both.
Anatomy of modern cold outreach
How a 2026 cold email is engineered.
The hidden cost of 30 minutes of email triage
What 30 minutes a day costs over a working year.
All muscle, no curiosity
On the inbox as a place where attention goes to die.
Email bounce vs block vs filter
Three things people mean by "did not arrive".
What happens to filtered emails
Deletion, the spam folder, or a waiting room.
Email Protection
The best way to stop spam emails in 2026
A field guide to economic friction.
Why your Gmail spam filter is not enough
Where Gmail catches the obvious cases and where it stops.
How to defend your inbox from phishing in 2026
A practical playbook for the post-AI phishing era.
Phishing emails getting harder to spot
Why content-based defenses are losing ground.
Phishing emails that fool Gmail
Specific message shapes Gmail does not catch.
Anatomy of a modern phishing email
A structural breakdown of the six parts.
Seven phishing patterns knowledge workers see
Recurring shapes specific to professional inboxes.
Microsoft 365 phishing as the top vector
Why M365 became the most-targeted environment.
Business email compromise
A short, plain-English explainer.
BEC survival guide for small business
A small-business view of what BEC looks like.
Real estate wire fraud and email protection
A working playbook for closing teams.
Construction invoice fraud and email protection
How invoice-redirect fraud reaches contractors.
Why we do not use AI to fight phishing
A founder note on structural friction.
What is DMARC, DKIM, and SPF
The three sender-authentication standards.
What is sender reputation
How mailbox providers score sending domains.
A complete guide to Gmail filters in 2026
What you can do natively and where it stops.
Inbox Psychology
Your attention has a price
On the economics of attention in 2026.
Your attention is your life
A founder note on why this matters.
The natural state of things
On where the inbox got its current shape.
The only room without a door
A note on inbox metaphors.
The two missing pieces of the internet
On identity and price in inbound communication.
Will prospects be annoyed by the cover charge
The honest answer.
What senders see (default rejection email)
The exact copy a first-time sender encounters.
Open Protocols
Pillar Guide
Email Security 101
The basics that hold across attack types.
The Phishing Defense Stack
A working defense for AI-generated phishing, BEC, and impersonation.
The Spam Defense Stack
For bulk spam, cold outreach, and the well-crafted first email.
Setting Up Rythm
The 12-minute install on Gmail or Outlook.
Migrating From a Competitor
Switching to Rythm without changing your email address.
Use Cases
Rythm for founders
The founder cocktail of inbox attacks.
Rythm for creators
For creators whose addresses leak and who get pitched daily.
Rythm for freelancers
For solo operators who bill by the hour.
Rythm for journalists
For inboxes that take public source mail.
Rythm for podcasters and speakers
For inboxes that field daily booking requests.
Solo attorney email security
Wire-fraud and client confidentiality at consumer pricing.
CPA firm email security
Tax-season volume and 1040 traffic.
Email security for financial advisors
Sized for an advisor practice handling client transfers.
RIA firm email security
For the registered investment advisor inbox.
Insurance agency email protection
For agency principals and producers.
Marketing agency email security
For people who run cold outreach professionally.
Healthcare practice email security
For a practice with a Gmail or Workspace account.
Nonprofit email security
For development directors and small staff.
Email security for academics and researchers
For inboxes that field public research mail.
Email security for open source maintainers
For maintainers whose inbox is public infrastructure.
HNWI email protection
For high-net-worth individuals and their offices.
One plan. One price.
Keep your existing Gmail or Outlook. Cancel anytime.
$1.65
per month
Annual on Lightning includes one bonus month. See full pricing.