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Master Cheatsheet · 2026 Edition
B2B Email SaaS
Cold Outreach vs. Permission Marketing
A complete guide to Instantly.ai, Apollo.io, Woodpecker, Mailchimp, and Constant Contact — pricing, features, compliance, and when to use each.
The fundamental divide
These are not interchangeable tools. Using the wrong category for your use case risks account suspension or wasted spend.
Pricing snapshot
All prices verified May 2026. Annual billing shown where available. Real-world costs often run higher — see the full table below.
Instantly.ai
$37.60/mo (annual)
ModelEmail volume / mo
Growth$37.60–$47/mo
Hypergrowth$77.60–$97/mo
Light Speed$358/mo
Full stack min.~$124/mo
Free plan✗ (14-day trial)
Apollo.io
$49/user/mo (annual)
ModelPer seat + credits
Basic$49–$59/user
Professional$79–$99/user
Organization$119–$149/user
Real cost$150–$400/user
Free plan✓ (very limited)
Woodpecker
$24/mo (annual)
ModelProspects contacted
Starter (500/mo)$24–$29/mo
Growth (10k/mo)~$126/mo
Scale (100k/mo)~$903/mo
LinkedIn add-on+$29/acct/mo
Free plan✗ (7-day trial)
Mailchimp
$13/mo (500 contacts)
ModelContacts in list
Essentials$13/mo
Standard~$20/mo
Premium~$350+/mo
Free plan✓ (250 contacts)
Cold email✗ Prohibited
Constant Contact
$12/mo (500 contacts)
ModelContacts in list
Lite$12/mo
Standard$35/mo
Premium$80/mo
Free plan✗ (14-day trial)
Cold email✗ Prohibited
Full feature comparison
Instantly, Apollo, and Woodpecker vs. Mailchimp and Constant Contact across every major dimension.
| Feature | Instantly.ai | Apollo.io | Woodpecker | Mailchimp | Constant Contact | |
|---|---|---|---|---|---|---|
| ⚡ Fundamentals | ||||||
| Primary use case | Cold email at scale | Sales intelligence + outreach | Cold email, agency outreach | Newsletter & campaign marketing | SMB email + event marketing | |
| Who it’s built for | SDRs, growth teams | Sales teams, RevOps | Agencies, B2B sales | Marketers, ecommerce, creators | SMBs, nonprofits, event orgs | |
| Recipient type | Non-opted-in prospects | Non-opted-in prospects | Non-opted-in prospects | Opted-in subscribers only | Opted-in subscribers only | |
| Email style | 1:1 personalised sequences | 1:1 personalised sequences | 1:1 personalised sequences | Broadcast campaigns + automation | Broadcast campaigns + automation | |
| G2 rating | ★ 4.3 / 5 | ★ 4.7 / 5 (9,400+ reviews) | ★ 4.3 / 5 | ★ 4.5 / 5 | ★ 4.0 / 5 | |
| 💰 Pricing model | ||||||
| Pricing unit | Email volume / moNot per seat | Per seat + creditsCosts multiply with team | Prospects contactedNot emails sent | Contacts in listScales steeply | Contacts in list317% jump at 1k contacts | |
| Team members | ✓ Unlimited (no per-seat) | ✗ Per seat — costs multiply | ✓ Unlimited (no per-seat) | ~ Limited on lower tiers | ~ Up to 10 on top plans | |
| Overage handling | Hard send cap — stops sending | Credit overages $0.20+ each | Must delete prospects or upgrade | Charged for extra sends | $0.002 per email over limit | |
| Hidden cost risk | High — 3 separate products | High — credit burn + seat cost | Medium — LinkedIn add-ons | High — steep list-size tiers | Very high — aggressive scaling | |
| Annual discount | ~20% | ~20% | ~15–20% | — | 15% (nonprofits 30%) | |
| ✉️ Email sending features | ||||||
| Email warmup | ✓ Included all plans | ✗ Not included | ✓ Included all plans | ✗ Uses own shared infra | ✗ Uses own shared infra | |
| Unlimited email accounts | ✓ All plans | ✗ Plan-limited | ✓ All plans | N/A — single sender | N/A — single sender | |
| Inbox rotation | ✓ | ✗ | ✓ | ✗ | ✗ | |
| Sequences / drip | ✓ Core feature | ✓ Core feature | ✓ Core feature | ~ Automations (Standard+) | ~ Automations (Standard+) | |
| A/B testing | ~ Hypergrowth+ only | ✓ Basic+ tier | ✓ All paid plans | ✓ Standard+ | ✗ Premium only | |
| Deliverability monitoring | ~ Analytics; inbox placement add-on | ~ Basic reporting | ✓ Built-in, all plans | ~ Basic reporting | ~ Basic reporting | |
| Drag-and-drop templates | ✗ Plain-text focused | ~ Basic | ~ Basic | ✓ Extensive library | ✓ Extensive library | |
| AI writing / personalisation | ✓ Icebreakers, dynamic variables | ✓ Professional+ AI assist | ~ Basic personalisation | ✓ AI content recommendations | ~ Limited AI tools | |
| Segmentation | ~ Basic filters | ✓ Advanced | ~ Basic | ✓ Predictive segmentation | ✓ Advanced (Standard+) | |
| Unified inbox | ✓ Hypergrowth+ | ✓ | ✓ | N/A | N/A | |
| 🔍 Lead data & prospecting | ||||||
| Built-in lead database | ~ Instantly Credits add-on$47–$169/mo separate | ✓ 210M+ contacts includedCore product differentiator | ✗ Bring your own listLead finder add-on available | ✗ Bring your own list | ✗ Bring your own list | |
| Contact enrichment | ~ Via Lead Finder credits | ✓ Included (uses credits) | ✗ Limited natively | ✗ | ✗ | |
| Buying intent data | ✗ | ✓ Basic+ tier | ✗ | ✗ | ✗ | |
| Email verification | ✓ Catch-all verification | ✓ | ✓ Catch-all included | ~ Basic bounce handling | ~ Basic bounce handling | |
| 🔗 CRM & integrations | ||||||
| Native CRM | ~ CRM plan add-on ($47/mo) | ✓ Built-in pipeline & deals | ✗ External CRM via integrations | ~ Basic audience/contact mgmt | ~ Basic contact management | |
| Key integrations | HubSpot, Salesforce, Pipedrive, Zapier | HubSpot, Salesforce, native CRM | HubSpot, Pipedrive, Salesforce, Zapier | Shopify, WooCommerce, Canva, 300+ apps | Shopify, Eventbrite, 300+ apps | |
| Agency / white-label | ~ DFY add-on | ✗ | ✓ Full white-label agency panel | ✗ | ✗ | |
| Multichannel (LinkedIn, SMS, calls) | ~ Multi-channel via CRM plan | ✓ LinkedIn + dialer (Pro+) | ~ LinkedIn add-on $29/acct/mo | ~ Social posting + SMS add-on | ✓ Social posting + SMS + events | |
| Landing pages / forms | ✗ | ~ Basic | ✗ | ✓ Included | ✓ Included | |
| Event registration | ✗ | ✗ | ✗ | ✗ | ✓ Native — unique feature | |
| 🛡️ Compliance & legal | ||||||
| Cold email permitted? | ✓ Core purpose | ✓ Core purpose | ✓ Core purpose | ✗ Prohibited in ToS | ✗ Prohibited in ToS | |
| Compliance framework | CAN-SPAM B2B compliant | CAN-SPAM B2B compliant | CAN-SPAM B2B compliant | Requires GDPR/CAN-SPAM opt-in | Requires GDPR/CAN-SPAM opt-in | |
| Cold email account risk | None — built for it | None — built for it | None — built for it | Account suspension | Account suspension | |
| Sender reputation tools | Warmup, rotation, DKIM/SPF setup | DKIM/SPF, limited warmup tools | Warmup, deliverability monitor, DKIM/SPF | Shared sending infrastructure | Shared sending infrastructure | |
Decision guide — which tool for which scenario?
Match your situation to the right platform before committing.
| Your situation | Best choice | Why |
|---|---|---|
| You have a lead list and need high-volume cold email from multiple domains | Instantly.ai | Unlimited inboxes, built-in warmup, and volume-based pricing (not per seat) make it the best pure cold-send engine |
| You need to find B2B leads AND reach out to them in one platform | Apollo.io | 210M+ contact database with intent signals, sequences, LinkedIn, and a native CRM — all under one login |
| You’re an agency managing multiple client outreach campaigns | Woodpecker | White-label agency panel, deliverability monitoring on all plans, and prospect-based pricing that doesn’t penalise team size |
| You want to nurture an existing opted-in email list with beautiful branded campaigns | Mailchimp | Rich template library, ecommerce integrations, predictive segmentation, and automation journeys built for subscriber marketing |
| You run events, are a nonprofit, or a local/retail SMB with a small opted-in list | Constant Contact | Native event registration with payment processing is unique in this category. 30% nonprofit discount and a simple editor for non-technical users |
| You have a small budget and just want to test cold email outreach solo | Woodpecker or Instantly.ai | Woodpecker’s $24/mo starter is the cheapest entry. Instantly’s $47/mo gets you unlimited inboxes if deliverability is a priority |
| You need phone / mobile data in addition to email for outbound calling | Apollo.io | Only Apollo includes mobile credits and a built-in sales dialer. The others are email-only tools |
| You want to run both cold outreach AND newsletter campaigns | Two tools: Instantly + Mailchimp | These are genuinely different tools for different channels. Stack them — don’t try to make one do the other’s job |
Key insights & watch-outs
The things most pricing pages won’t tell you.
Instantly.ai — Modular cost trap
The advertised $37/mo covers only the Outreach module. Add Lead Finder and CRM and the minimum full-stack spend is ~$124/mo. Most users end up paying $180–$241/mo for a complete setup.
Apollo.io — Credit burn is the real cost
At $49/user on paper, active SDR teams typically spend $150–$400/user/month once mobile credit overages kick in. Phone numbers cost 8× more credits than emails. Forecast credit consumption before signing.
Woodpecker — Prospect ≠ email
Woodpecker limits new prospects added per month, not emails sent. Follow-up emails to existing prospects don’t count. Great for multi-step sequences but you must delete old contacts to add new ones at lower tiers.
Mailchimp — Free plan gutted in 2026
The free plan was cut to 250 contacts and 500 sends/mo in January 2026 (down from 500/1,000). Most small businesses outgrow it within weeks. Budget for Essentials ($13/mo+) from the start.
Constant Contact — Steepest list scaling
Going from 500 to 1,000 contacts on the Lite plan jumps from $12 to $50 — a 317% price increase for doubling your list. Constantly recalculate your cost as your subscriber base grows.
The compliance rule everyone forgets
Mailchimp and Constant Contact will suspend your account for sending to purchased or cold lists — it violates their ToS. Cold outreach requires a dedicated tool. Never use permission-based platforms for prospecting.
Platform verdicts
The one-line summary for each tool.
Instantly.ai
Volume cold email engine
The go-to for teams sending at scale from multiple domains. Unlimited inboxes + warmup is genuinely hard to beat. Real costs run 3× the headline price once you add leads and CRM.
Apollo.io
All-in-one sales intelligence
Best when you need leads AND outreach in one place. The 210M+ database with intent signals is the real differentiator. Watch the credit system — it’s the #1 budget surprise.
Woodpecker
Agency & deliverability specialist
Lowest true starting price, white-label agency panel, and the best built-in deliverability monitoring of the three. Scales steeply at high prospect volumes.
Mailchimp
The brand marketing workhorse
Rich templates, ecommerce automations, and predictive segmentation make it the default for subscriber-based email marketing. Not for cold outreach — full stop.
Constant Contact
SMB & event marketing specialist
Unique native event registration with payment processing. Best suited for nonprofits, local businesses, and community orgs. Most aggressively priced as your list grows.