Apollo.io vs Warmer.ai

Two fact sheets from our own research, side by side — pricing, platforms, API access and status re-checked by us rather than quoted from the vendors.

The short answer

Entry price: Apollo.io from $49/seat/mo, Warmer.ai from $59/mo — different billing units, so no direct winner
Free plan: Only Apollo.io (Warmer.ai has paid plans only)
Public API: Both have one
Higher Trust score: Warmer.ai — 86 vs 79 for Apollo.io
Best fit: Apollo.io: Startups and SMB sales teams that need prospecting data plus sequences under one roof · Warmer.ai: Agencies personalizing large outbound lists on behalf of clients

From our own records as of each tool's last check. Anything we have not confirmed is left out rather than guessed. How we verify

Apollo.ioB2B contact database with sequencing, dialling and agents that research accounts and book meetings

Warmer.aiEnriches lead lists and writes personalized cold emails

Side by side

Fact	Apollo.io	Warmer.ai
Category	Sales Intelligence & Enrichment	Cold Email & Outreach
Pricing model	Freemium	Paid
Starts at	$49/seat/mo	$59/mo
Public API	Yes	Yes
Trust score	79 / 100	86 / 100
Platforms	Web, Chrome extension, API	Web, API
Company	ZenLeads Inc. (Apollo.io)	Warmer
Launched	—	2021
Last verified	Sep 6, 2026	Sep 6, 2026

What our research says

Apollo.io

Apollo is the default choice for a small sales team that wants database, sequencing and dialler in one subscription without a ZoomInfo contract, and the agent layer now does the list-building and first-draft outreach that used to need a separate tool. The catch is the credit meter: AI research, enrichment and exports all draw from a pool that resets monthly, so the sticker price is the floor, not the bill.

Pros

Database, sequencing, dialler, enrichment and meeting booking in one tool at $49 per user
A real free plan for light use, with no card required
MCP server, Chrome extension and Apollo Anywhere put the data inside Claude, ChatGPT, Gmail and the CRM
Agents trained on your ICP and playbooks handle list building and first drafts

Cons

Credits reset every cycle and do not roll over, and add-on credits bill immediately and recur
Data accuracy varies by region and seniority, and bounces still eat sender reputation
Price cards on the pricing page load client-side; the annual discount is not stated
API access, SSO and advanced security are reserved for the Custom tier

Warmer.ai

A narrow, well-scoped tool: feed it a list, get back a personalized line per lead. If you already own a sequencer and only need the personalization layer, it is far cheaper than rebuilding the stack around Clay.

Pros

Unit cost falls steeply with volume, from about $0.12 to about $0.02 per lead
REST API plus CSV and JSON export, so it slots into an existing pipeline
Native connectors for the main CRMs and sequencers rather than Zapier-only
Trading since 2021, so not a weekend project that vanishes next quarter

Cons

$59 monthly floor applies even if you only need a few hundred leads
Credits arrive bundled with a tier rather than as pay-as-you-go top-ups
Output quality depends entirely on how much public data a prospect has
The 3x reply-rate figures on the site are vendor marketing, not audited results

Which one fits

Choose Apollo.io if you need

Startups and SMB sales teams that need prospecting data plus sequences under one roof
Reps who work from Gmail, a CRM or Claude and want the database reachable from there
Teams that want agents to research accounts and draft outreach from their own playbook

Choose Warmer.ai if you need

Agencies personalizing large outbound lists on behalf of clients
Sales teams already running Outreach or Salesloft who need better first lines
Enriching a one-off CSV instead of subscribing to a full data platform