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lemlist, Instantly and Smartlead are polished hosted platforms. Mailchimp-style tools are built for newsletters. Stay in sight is open source and runs on your own Cloudflare account. Here is where each one fits, including where the hosted tools are the better choice.
| Feature | Stay in sight Open source, self-hosted | lemlist Hosted cold outreach | Instantly Hosted cold outreach | Smartlead Hosted cold outreach | Mailchimp Hosted newsletters |
|---|---|---|---|---|---|
| Where your data lives | Your own Cloudflare D1 database | Vendor cloud | Vendor cloud | Vendor cloud | Vendor cloud |
| Source code | Open, MIT licensed | Closed | Closed | Closed | Closed |
| How you pay | Nothing for the software; hosting from $0 | Monthly, per user | Monthly plans | Monthly plans | Monthly, by contacts |
| Time to first send | About 30 minutes of setup | Minutes | Minutes | Minutes | Minutes |
| Mailboxes you send from | Gmail / Workspace (API) and Amazon SES | Google, Microsoft, SMTP | Google, Microsoft, SMTP | Google, Microsoft, SMTP | Mailchimp’s own servers |
| Cold outreach to people who didn’t sign up | Yes | Yes | Yes | Yes | Not permitted |
| Newsletters with one-click unsubscribe | Yes, newsletter mailboxes | Not the focus | Not the focus | Not the focus | Yes |
| Multiple mailboxes sending as one | Mailbox groups | Yes | Yes | Yes | n/a |
| Warm-up | Volume ramp only | Engagement network | Engagement network | Engagement network | n/a |
| Built-in lead database | No, bring your own | Yes | Yes | Yes | No |
| AI rewrite per recipient at send time | Yes, your prompt and model | AI features | AI features | AI features | AI writing help |
| Agent access | 64-tool MCP server + REST API | API | API | API | API |
| Team seats and roles | One shared passcode | Yes | Yes | Yes | Yes |
Hosted tools change quickly; check each vendor’s site for current features and prices.
You want the data
Contacts, every email, every reply and AI costs sit in a SQL database on your account. Query it, back it up, move it.
You’re tired of per-seat pricing
The software is free. Hosting is Cloudflare’s free plan or $5 a month, and AI is fractions of a cent per email.
An agent does the work
64 MCP tools and a full REST API: an agent can build lists, preview sends, schedule through a group and answer replies.
You send more than cold email
Newsletters and customer conversations run in the same app, each built correctly for its purpose and do-not-send scope.
You run outreach for clients
One command deploys a separate tenant — Worker, database and secrets — per client.
You need leads, not just sending
lemlist, Instantly and Smartlead include prospect databases. Stay in sight expects you to bring contacts.
You want engagement warm-up
Their warm-up networks send and open emails between members. Stay in sight only ramps your volume.
You send from Outlook / Microsoft 365
Stay in sight connects Gmail, Google Workspace and Amazon SES only.
You want zero setup
No Google Cloud project, no Cloudflare account, no terminal.
A team needs roles and multichannel
Seats, permissions, and steps beyond email, such as LinkedIn in lemlist.
vs lemlist
A hosted outreach platform built around personalized multichannel sequences, with a lead database, warm-up and team features.
Stay in sight focuses on email only, runs on your infrastructure and has no per-user price. lemlist is the stronger pick when you want leads, LinkedIn steps and a team workspace out of the box.
vs Instantly
A hosted cold email platform known for sending from many mailboxes, with warm-up, a unified inbox and lead finding.
Mailbox groups and warm-up give Stay in sight the same “many mailboxes as one” sending, on mailboxes you connect yourself. Instantly wins on Microsoft mailboxes, engagement warm-up and leads; Stay in sight wins on ownership, agent access and newsletters.
vs Smartlead
A hosted cold email platform popular with agencies, with mailbox rotation, warm-up and client workspaces.
Agencies can get similar separation with Stay in sight’s one-command tenant deploys, each client in its own Worker and database. Smartlead is quicker to roll out and includes warm-up and white-label options.
vs Mailchimp
A hosted newsletter and marketing automation platform for people who signed up.
Stay in sight’s newsletter mailboxes (best on SES) cover list sends with one-click unsubscribe and drip series. Mailchimp has a visual email designer, landing pages and audience tools; it doesn’t allow cold outreach.
There is no license fee. You pay the providers you already use, directly.
Hosted tools are priced per seat, per plan or per contact, every month. Compare against their current pricing pages.
About 30 minutes from clone to first send.
This comparison describes the hosted products in general terms from their public positioning at the time of writing, November 2026. Features and prices change; check each vendor’s website before deciding. Product names are trademarks of their owners; Stay in sight is not affiliated with them.