Compare
Open-source alternatives to your outbound stack
Most outbound setups stitch a data tool, a sequencer, a LinkedIn tool and a CRM together. AgentSDR is one self-hosted app for the workflow. Here is what it replaces, what it does not, and where each tool is the better pick.
- Enrichment tooltables, AI columns
- Email sequencermailboxes, limits
- LinkedIn toolinvites, follow-ups
- WhatsApp messagingcampaigns, calls
- Shared inbox and CRMreplies, pipeline
One app
AgentSDR
One lead record per person. Self-hosted, AGPL-3.0, with no seat or contact fees from us.
- Enrichment tool
- Email sequencer
- LinkedIn tool
- WhatsApp messaging
- Shared inbox and CRM
What it replaces
The workflow, not the database
AgentSDR takes over the steps between having a list and closing a reply. Contact data stays with whichever provider you trust.
Enrichment and list building
Tables with enrichment, AI, HTTP and formula columns, fed by 15 providers you connect with your own keys.Email sequencing
Multi-step sequences from your Google Workspace mailboxes, with per-mailbox limits, bounce handling and unsubscribes.LinkedIn and WhatsApp outreach
Invitations, follow-ups, message campaigns and recorded calls through Unipile, paced to limits you set.The inbox and CRM
Replies from every channel classified, drafted and tracked in one pipeline, with one record per person.
Pick a comparison
Five tools, five different angles
- Clay alternativeThe open-source Clay alternativeClay is a hosted data and workflow platform built around enrichment tables and a marketplace of data providers.Compare with Clay
- lemlist alternativeThe open-source lemlist alternativelemlist is a hosted multichannel outreach platform with a lead database, deliverability tools and AI agents.Compare with lemlist
- HeyReach alternativeThe open-source HeyReach alternativeHeyReach is a hosted LinkedIn outreach tool built around many sender accounts and a unified inbox.Compare with HeyReach
- Instantly alternativeThe open-source Instantly alternativeInstantly is a hosted cold email platform with unlimited sending accounts, warm-up, a lead database and an AI CRM.Compare with Instantly
- Apollo alternativeThe open-source Apollo alternativeApollo is a hosted go-to-market platform: a B2B contact and company database with engagement tools on top.Compare with Apollo
At a glance
Every tool, side by side
Marks come with words, so you can read the table without relying on colour. Scroll sideways on a small screen.
| Feature | AgentSDR | Clay | lemlist | HeyReach | Instantly | Apollo |
|---|---|---|---|---|---|---|
| Open source and self-hostable | YesAGPL-3.0, self-hosted | Hosted service | Hosted service | Hosted service | Hosted service | Hosted service |
| Seats and pricing model | No seat fees from AgentSDR | Plans plus credits, unlimited seats | Tiered plans, credits as add-on | Per sender, tiered | Plans plus credits, unlimited CRM seats | Per seat, pooled credits |
| Built-in contact data | NoNone, bring providers | PartlyProvider marketplace | Yes650M+ contacts | Not comparedNot compared | Yes450M+ contacts | Yes240M contacts |
| Enrichment tables and AI columns | YesTables, 15 providers, AI | YesCore product | PartlyEnrichment credits and agents | Not comparedNot compared | PartlyEnrichment and AI agents | PartlyEnrichment and AI agents |
| Email from your own mailboxes | PartlyGoogle Workspace only | PartlyEmail-only sequencer | YesWith warm-up | PartlyVia integrations | YesUnlimited accounts | YesEmail sequences |
| LinkedIn automation | YesSeveral accounts | NoSequencer is email only | YesMultichannel plan | YesCore product | Not comparedNot compared | Not comparedNot compared |
YesMessages and calls | NoSequencer is email only | PartlyAdd-on | Not comparedNot compared | Not comparedNot compared | Not comparedNot compared | |
| Unified inbox | YesAll three channels | PartlyEmail replies | YesAcross channels | PartlyLinkedIn messages | YesMaster inbox | Not comparedNot compared |
| AI classifies and drafts replies | YesWith approval | Not comparedNot compared | Not comparedNot compared | Not comparedNot compared | YesAI Reply Agent | Not comparedNot compared |
| Email warm-up | NoNot built in | YesIn its sequencer docs | Yeslemwarm | Not comparedNot compared | YesIncluded | Not comparedNot compared |
“Not compared” means we could not confirm it from that company’s own site, so we claim nothing either way. Clay, lemlist, HeyReach, Instantly and Apollo are trademarks of their owners. Comparison based on publicly available information as of October 2026.
FAQ
Questions, answered
What is the best open-source alternative to Clay, lemlist, Instantly or Apollo?
AgentSDR is an open-source (AGPL-3.0), self-hosted AI SDR with enrichment tables, email, LinkedIn and WhatsApp campaigns, a shared inbox and an AI CRM. It replaces the workflow of those tools. It does not include a contact database, so you bring lists or connect data providers with your own keys.
Does AgentSDR replace Apollo or Clay for data?
No. AgentSDR has no built-in contact database or data marketplace. It connects 15 enrichment providers, including Apollo, with your own accounts, so you can keep paying a data vendor and drop the rest of the stack.
Where are the other tools better than AgentSDR?
Built-in contact data (lemlist, Instantly and Apollo), hosted convenience and support, email warm-up and inbox placement tools (lemlist, Instantly), waterfall enrichment and CRM syncing (Clay), and white-label agency plans (HeyReach). Each comparison page lists them.
Is AgentSDR cheaper?
AgentSDR charges no seat, sender or contact fees. You still pay for your server and for every service you connect, such as Google Workspace, Unipile, your AI model and any data provider, so total cost depends on your setup.
How are these comparisons sourced?
Statements about other tools come only from their own websites and documentation, checked in October 2026. We state no competitor prices. Where we could not confirm something, the tables say "Not compared".
What does AgentSDR not do yet?
It sends email only from Google Workspace mailboxes, has no waterfall enrichment, no email warm-up, no HubSpot or Salesforce sync, and each campaign covers one channel rather than mixing email and LinkedIn steps.
Keep exploring
- Open source & self-hostedAGPL code on your server, with your own AI key
- Enrichment tablesAI columns, APIs, formulas and Apollo in a grid
- AI CRMEvery reply classified and the lead moved for you
- FoundersFounder-led outbound without an SDR team
- AgenciesOne deployment, a separate organization per client
- GuidesPlaybooks for safe, multichannel outbound
Run your outbound on your own server
Clone the repo, connect your accounts and compare for yourself. No seats, no per-contact pricing, and your data stays in your database.