AI ARK
FeaturedList buildA cheap database of business contacts. Use it to build lists, find lookalike companies, ones that look like your best customers, and export verified emails.
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.
Start with a best-of guide for the job you need done. Use Compare when two tools look the same.
Each guide names the tool to pick for each kind of team.
Best-of guide
Instantly wins if you want one plan that finds people, writes the emails and sends them. AiSDR wins if you want to test with no subscription. Artisan wins if you want a vendor’s team to set it up with you. Smartlead wins if you write your own emails and want to pay less to send them.
Best-of guide
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
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
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
Need Bing's own results? Use SearchApi. Need to find pages and read them? Use Firecrawl. Building an AI agent? Look at Perplexity's Search API.
Best-of guide
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.
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
A best-of guide ranks the tools for one job. Compare puts two tools side by side when their websites sound alike.
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 toolsClick a tool to read our review. Click Go to the website to visit it.
A cheap database of business contacts. Use it to build lists, find lookalike companies, ones that look like your best customers, and export verified emails.
A newsletter tool with referrals, ads and paid recommendations. It takes a 0% cut of your revenue. The Free plan has unlimited sends.
FullEnrich does enrichment: it fills in missing emails and mobile numbers for leads, the people on your list. It uses a waterfall, which tries 20+ finders in order until one finds a match, per FullEnrich’s homepage, checked October 20, 2026. FullEnrich runs it for you, and you pay only when an email or mobile is found and checked.
Google and Microsoft inboxes set up for you, with unlimited replacements. Built for teams that send at high volume.
Apify is a marketplace of ready-made data collectors called actors. An actor is a small program that collects data from one site, like Google Maps.
Apollo finds people and lets you pay credits to see an email or phone number. You can also send email from the same login. Use another tool for the contacts Apollo can’t find.
A managed waterfall that charges only for valid finds. A waterfall tries several providers in order until one finds a match. Use it as the last step after cheaper finders.
A tool that links many data providers into one workflow. It is strong for building workflows. It costs too much as a data source unless you bring your own provider keys.
A waterfall you can use with no setup. A waterfall tries several data providers in order until one finds a match. Starter also includes sequences, each a set of emails and call tasks sent over days.
Exa is an AI search API, a way for your own code to search the web and get answers back. It is built to answer questions, a different job from a plain list of Google results.
Firecrawl reads web pages for your code and can also run searches. Both share one balance of credits.
Website builder with a newsletter and paid memberships built in.
Standalone inbox placement tester that works with any sending tool.
Buy mailboxes straight from Google Workspace or Microsoft 365. You run the admin console, your sender reputation and the DNS settings yourself. DNS settings are the records on your domain that tell other mail servers where its mail goes.
gosom/google-maps-scraper is free, open-source code that collects Google Maps business listings on your own computer.
Hypertide sets up Google, Microsoft and Microsoft 365 mailboxes for you. Each customer gets a separate account, and the mailboxes upload to your sequencer on their own.
InboxKit sells email accounts on Google, Microsoft and Azure, Microsoft’s cloud service, for cold email, which is email to people who never asked for it. It also sells domains, the web addresses your mail comes from, and watches it all for problems. You set them up yourself with code or a dashboard.
A sequencer, the tool that sends cold email, meaning email to people who never asked for it, in steps over days. It connects unlimited email accounts, and warmup, which sends small, safe emails so new inboxes look normal, is built in. Every plan includes lead credits, which pay for finding people to email.
A data tool built for API use, a way for your own code to talk to it, and for plugging into tools like Clay with your own LeadMagic account. An email costs 1 credit. A mobile number costs 5.
SMTP mailboxes for cold email. SMTP mailboxes run on mail servers outside Google and Microsoft. Broken mailboxes fix themselves, IPs rotate and you can run it by API or MCP. Google Workspace mailboxes are an extra option.
SMTP mailboxes on dedicated IPs for cold email. A dedicated IP is a mail server address only you use. Your sequencer sends through them.
Outscraper collects Google Maps business listings into a spreadsheet, and you pay only for the places you pull.
Perplexity's Search API returns web results from Perplexity's own search engine. Your code sends a question and gets links and text back.
An email finder you use as one step in a waterfall for LinkedIn Sales Navigator lists. It is rarely the only data tool you need.
ScaledMail sells sets of mailboxes, meaning email accounts, on Google, Outlook and SMTP, the basic system mail servers use to send email. Its team sets them up for you and talks with you in a shared Slack group chat.
SearchApi sells Google search results as data for your code. It bills only for searches that work.
Smartlead is a sequencer, the tool that sends your email steps over days, for cold email, which is email to people who never asked for it. It connects unlimited mailboxes, which are email accounts, and includes warmup, which sends small, safe emails so new mailboxes look normal. It spreads sends across your mailboxes and puts all replies in one inbox. Agencies, firms that run cold email for clients, can add white label, which puts your brand on the tool and gives each client a portal.
Tavily is a search API built for AI agents. It returns short text from web pages, ready to hand to an AI model.
Warmup Inbox is a standalone tool for warmup, which sends small, safe emails so a new inbox looks normal before cold email, meaning email to people who never asked for it.
Google and Microsoft inboxes you set up yourself, or through the API, the way your code talks to Zapmail, on the Pro plan. Warmed up plans are sold separately.