Premail vs SaneBox
Both tools handle the same problem (a noisy inbox) in opposite ways. SaneBox is a cloud service that sorts mail on its servers. Premail is a desktop app that filters on your own machine with an AI model you control. Here is an honest, side-by-side breakdown.
Free for personal inboxes. No account required.
Why people switch to Premail
SaneBox is a hosted service: your mail flows through its servers and lands in its smart folders (SaneLater, SaneBlackHole, etc.). Premail runs as a quiet companion app on your computer and acts on your real inbox in your existing folders.
SaneBox publicly limits itself to mail headers and metadata because its servers see your mail. Premail has no servers, so it can use the full body as a classification signal. A modern LLM (Anthropic, OpenAI, or local Ollama) judges each message the way you would, with plain-English rules and adjustable confidence.
SaneBox is a per-inbox subscription with feature tiers. Premail is free for personal inboxes and adds a flat Pro subscription (or one-time Lifetime fee) for professional inboxes, unlimited custom rules, and Reputation Shield. Adding inboxes does not change the price.
Side by side
| Feature | Premail Local app on your computer | SaneBox Cloud service, IMAP integration |
|---|---|---|
| Where filtering happens | Your computer | SaneBox cloud |
| AI model you can choose | Ollama, Anthropic, OpenAI | Proprietary algorithm |
| Uses email body content as a classification signalSaneBox publicly limits itself to mail headers because its servers see your mail. Premail has no servers and can use the full body. | Headers only | |
| Fully offline optionPremail with Ollama processes mail with no data leaving your machine. | ||
| Free for personal inboxes | ||
| Per-inbox pricing | ||
| One-time Lifetime license | ||
| Runs while your laptop is offSaneBox runs in the cloud, so it filters 24/7. Premail catches up on missed mail when your computer wakes. | ||
| Native desktop app | ||
| Works with any email client | ||
| Plain-English custom rules | Limited | |
| Bulk unsubscribe | ||
| .eml file drag-and-drop rule debugger | ||
| Open audit log of every action | Limited | |
| Allowlist, blocked domains, unsubscribe protection | Partial | |
| Inbox cleaner for backlog | ||
| Gmail, Outlook, iCloud | ||
| No account required | ||
| Mobile appBoth tools rely on whatever mobile mail client you already use. SaneBox actions sync through the cloud; Premail actions appear because they were applied to the real inbox. |
Pricing
Every SaneBox tier caps how many email accounts it covers, so a second inbox means a higher tier rather than a second connection.
Free tier, then one flat price regardless of how many inboxes you connect
Subscription, tiered by number of email accounts
SaneBox pricing read from their own pricing page and verified . Prices change, so check the source before deciding.
Premail is not the only option, and pretending otherwise would not help you decide. These are the alternatives people actually weigh up against SaneBox, with prices read from each vendor's own pricing page.
| App | Price | Runs on | How it makes money |
|---|---|---|---|
| Premail | Free for up to 2 personal inboxes, then $9/mo, $79/yr, or $99 once | Your own computer | Paid licences |
| Clean Email | $9.99/mo, or $29.99/yr | Cloud | Subscriptions |
| Mailstrom | $9/mo, or $59.95/yr | Cloud | Subscriptions |
| Shortwave | $30 per seat/mo | Cloud client | Subscriptions |
Best for: Filtering mail before you read it, without a service holding your mailbox
Runs as a desktop app alongside the email client you already use, applying rules you write in plain English. Nothing passes through a Premail server, and one price covers every inbox you connect. It only works while your computer is on, so overnight triage on a phone is a genuine reason to pick something else here.
Best for: The most complete cleanup toolkit across several mailboxes
Clean Email includes every feature at every tier and prices purely on how many mailboxes you connect.
Best for: Genuinely enormous backlogs, bundled by sender and size
Mailstrom tiers on three axes at once: how many accounts, how large a mailbox it will process, and how many smart filters you get.
Best for: Searching and reasoning across a large mail history
Shortwave tiers on AI capacity: how much AI usage, how far back AI search reaches, and how many AI-powered filters you get. Figures below are its Business plans.
Pick SaneBox if
Pick SaneBox if you need server-side filtering that works 24/7 with no desktop dependency, you want a more mature product with a long track record, and you do not mind paying a per-inbox subscription. SaneBox is also a strong choice if you cannot or do not want to run Ollama locally and do not want to manage an AI API key.
Pick Premail if
Pick Premail if you want filtering to happen on your own hardware (or fully offline with Ollama), you prefer a free tier for personal mail and a flat upgrade price, and you want plain-English rules powered by a real LLM. Premail is also a strong fit if you care about a fully transparent audit log of every action and want a drag-and-drop debugger for tuning rules.
FAQ
Can I run Premail and SaneBox side by side?
Yes. They both act on your real mailbox over standard mail protocols, so you can keep SaneBox folders around while you evaluate Premail. Just be aware that two filters acting on the same inbox can move the same message twice if their rules overlap.
Which one is more private?
Premail. SaneBox processes your mail on its own infrastructure. Premail runs on your computer, and with Ollama, classification is fully offline. With Anthropic or OpenAI, requests go straight from your machine to the provider, not through Premail's servers, because there are no Premail servers in the loop.
Which one is cheaper?
Premail is cheaper for personal use because it is free. For professional inboxes the comparison is closer: Premail is a flat Pro subscription (or Lifetime), SaneBox is per-inbox per month. AI costs in Premail are bring-your-own-key: either zero (Ollama) or roughly $0.01 per 1,000 emails (Claude Haiku or GPT-4o Mini).
Which one is more accurate?
It depends on your inbox and your standards for accuracy. SaneBox tunes itself based on where you move messages over time, but it publicly limits itself to mail headers, so it has to infer everything from sender, subject, and historical behavior. Premail can use the full body of the message as a classification signal, which is why a rule like 'AI-generated cold pitch' actually works. The Dropzone in Premail also lets you drag any .eml file in and see exactly which rule matched and why.
Can I migrate from SaneBox to Premail?
Yes. Disconnect SaneBox from your account when you are ready, install Premail, and connect the same inbox. Existing folders like SaneLater stay in place; you can reuse them as targets in Premail rules or empty them out at your own pace.
What about mobile?
Neither product has its own mobile email client. Both rely on whatever mail app you already use on your phone. SaneBox actions sync because they happen in the cloud. Premail actions also show up on phone because they happen on the real inbox, but the desktop has to be on for them to fire in real time.
Also considering
Free for personal inboxes. No Premail account, no servers touching your email. Works alongside the email client you already use on Mac, Windows, and Linux.