GTM Tech Stack

Sales and outbound tools we run every day, with a plain verdict on each one.

We use every tool listed here, or we tested it hard next to the tools we already use. Each page says who should buy it and who should skip it.

Best tools by jobCompareStacks

Start with a best-of guide for the job you need done. Use Compare when two tools look the same.

Best tools for each job

Each guide names the tool to pick for each kind of team.

See all guides

Best-of guide

Best Apollo alternatives · keep Apollo, swap one part

Keep Apollo for a small team that finds contacts and sends sequences in one tool. Add ZoomInfo or Cognism for phone or EU data. Move sending to Smartlead at volume. Use AI Ark for cheap lists and FullEnrich for hard misses.

Best-of guide

Best B2B data providers · where your contacts come from

Pick Apollo for a mainstream contact database with sequences. Pick AI Ark for lookalike companies and a cheap first pass. Add FullEnrich to fill hard gaps after. Add Sales Navigator for exact titles. Use Clay only if your team already runs it.

Best-of guide

Best B2B phone number finders · pay per mobile found

Pick FullEnrich to pay only for mobiles it finds. Pick BetterContact for a cheap waterfall that charges for valid mobiles on Pro. Pick AI Ark to build your list first. Use Apollo if you already pay for its database and dialer.

Best-of guide

Best Clay alternatives · replace the job you used Clay for

Pick FullEnrich for mobiles. Pick BetterContact for an email and phone waterfall that charges only for valid finds. Pick AI Ark for cheap lookalike lists with rollover credits. Pick Apollo for a database and sequencer in one tool. Keep Clay for AI research tables.

Best-of guide

Best Clay waterfall providers · bring your own keys (2026)

Pick LeadMagic for the middle of your waterfall with your own key, at 5 credits per mobile. Pick Prospeo early or at the end. Use BetterContact or FullEnrich only on missing, high-value contacts. Pick Cleanlist if you won't build columns.

Best-of guide

Best cold email infrastructure · buy inboxes before sending

Pick Premium Inboxes to have your inboxes set up and replaced for you. Pick Inboxkit for an API and Azure. Pick Zapmail's pre-warmed plans for the fastest start. Send from Smartlead for many clients. Skip Instantly's mailboxes.

What people who use these tools say

Each quote comes from a named person who runs outbound.

“You're leaving 40% of potential leads on the table if you're using a single data source... The “Waterfall Enrichment” framework... up to an 85%+ valid email find rate.”

“Apollo goes first - not because it's the best, but because it's the cheapest per-credit... easy 60% before you spend real money on the hard 40%. ... Track cost-per-valid-contact, not cost-per-lead.”

“Same mailboxes, opposite service model... Zapmail is self-serve and API-driven, Premium Inboxes is managed and white-glove.”

Where to start

Read the guide first, then compare two tools.

A best-of guide ranks the tools for one job. Compare puts two tools side by side when their websites sound alike.

Best tools by jobCompare

Two tools can look the same in a demo. Pick both in Compare. Read who each one is for, who should skip it and what it costs before you buy.

Compare two tools

Every tool we cover

Click Read our review to see what we think of a tool. Click Go to the website to visit the tool.