Email Sequencing Tools Compared: Apollo vs Instantly vs Lemlist

Choosing the Right Email Sequencing Tool for Your B2B Outbound

Choosing the right email sequencing tool can make or break your outbound sales programme. The tool you select determines how efficiently you can reach prospects, how well you manage deliverability, and how seamlessly your outbound activity integrates with your broader sales operating system.

The three most popular options for B2B service firms are Apollo.io, Instantly, and Lemlist. Each has genuine strengths and real trade-offs. This guide provides an honest, detailed comparison to help you decide — based on our experience configuring outbound systems for dozens of UK-based consultancies and professional services firms.

Why the Tool Choice Matters More Than You Think

Before diving into the comparison, let us address a common misconception: "The tool does not matter — it is all about the message." This is partially true. Great messaging in a mediocre tool will outperform mediocre messaging in a great tool. But the right tool amplifies great messaging in ways that compound over time:

• Deliverability infrastructure determines whether your emails reach the inbox or the spam folder
• Data quality determines whether you are emailing real, relevant prospects or wasting time on invalid addresses
• CRM integration determines whether your outbound activity is visible alongside your deal pipeline
• Workflow efficiency determines how many hours per week your team spends on manual tasks versus actual selling
• Reporting and analytics determine whether you can optimise your campaigns intelligently or are guessing

For B2B service firms running lean teams, where every hour counts and every meeting matters, these differences translate directly into revenue.

Apollo.io: The All-in-One Platform

Apollo.io is an all-in-one sales intelligence and engagement platform that combines prospecting data, email verification, sequencing, and analytics in a single tool.

Core Strengths

• Built-in database of 270M+ contacts — no need for a separate prospecting tool. Search by industry, company size, job title, technology stack, funding stage, hiring signals, and dozens of other filters
• Email finding and verification integrated into the platform — verify emails before they enter your sequence, reducing bounce rates
• Advanced prospecting filters including intent data, technographic data, and job change alerts — know who is actively researching topics related to your services
• Phone numbers included for multi-channel outreach — call prospects directly from the platform
• Native CRM integration with Salesforce, HubSpot, and Pipedrive — activity syncs automatically
• Conversation intelligence features for recording and analysing sales calls
• Enrichment capabilities — automatically enrich your existing CRM contacts with fresh data
• Buying intent signals — identify companies actively researching topics related to your services

Sequencing Capabilities

Apollo's sequencing engine supports:

• Multi-step automated email sequences with personalisation variables
• Mixed sequences combining automated emails with manual tasks (calls, LinkedIn, custom actions)
• A/B testing of subject lines and email content
• Conditional branching based on prospect behaviour (opens, clicks, replies)
• Automatic pause when prospects reply or book meetings
• Team-level analytics with performance breakdowns by rep, sequence, and step

Limitations

• Deliverability features are solid but not best-in-class — Instantly has an edge on warm-up and rotation at high volumes
• The interface can feel overwhelming initially due to the breadth of features — there is a learning curve
• Data accuracy varies by region — UK and US data tends to be strongest; other regions may have lower coverage

Who It Is Best For

Firms that want a single platform for prospecting AND sequencing. Apollo eliminates the need to pay for separate data, verification, and outreach tools. For B2B service firms under 20 people, this simplification is significant — fewer tools means less complexity, fewer subscriptions, and faster onboarding.

Pricing

Starts at 49 per month per user for the Basic plan. Professional plan at 79 per month per user adds more advanced features including intent data and AI capabilities. Organisation plan at 149 per month per user includes everything plus advanced security and custom reporting.

Instantly: The Deliverability Specialist

Instantly has built its reputation on deliverability — helping teams send high volumes of cold email while maintaining strong inbox placement rates.

Core Strengths

• Unlimited email sending accounts — connect as many mailboxes as you need without per-seat pricing on accounts
• Built-in email warm-up — Instantly's warm-up network automatically improves sender reputation for new domains
• Deliverability-focused architecture — smart sending rotation across mailboxes, automatic throttling, and bounce management
• Simple, clean interface focused on campaign management — less overwhelming than Apollo
• Email verification included in the platform
• Campaign analytics with focus on deliverability metrics alongside engagement metrics
• Lead finder — Instantly has added its own prospecting database, though it is less comprehensive than Apollo's

Sequencing Capabilities

• Automated multi-step email sequences
• Smart sending windows (send emails when prospects are most likely to read them)
• Automatic mailbox rotation to distribute sending across domains
• A/B testing for subject lines and email body variations
• Subsequence triggers based on prospect engagement
• Unified inbox for managing replies across all connected accounts

Limitations

• No built-in prospect database of Apollo's calibre — you typically need a separate data source for building prospect lists
• Limited CRM integration compared to Apollo — the integration exists but is not as deep or native-feeling
• No phone or multi-channel capabilities — Instantly is focused on email; calls and LinkedIn require separate tools
• No intent data or technographic filters — you cannot identify buying signals within the platform
• Limited enrichment — you need to bring your data already enriched

Who It Is Best For

Firms that already have a reliable data source (like Apollo for prospecting) and want maximum sending volume with industry-leading deliverability. Instantly excels when you are sending 500+ emails per day across many domains and need robust infrastructure to maintain inbox placement.

Pricing

Starts at 30 per month for the Growth plan. Hypergrowth plan at 77.60 per month adds more features. The Lead Finder add-on (for prospecting data) is priced separately starting at 47.90 per month.

Lemlist: The Personalisation Pioneer

Lemlist differentiates through advanced personalisation features and multi-channel sequence capabilities.

Core Strengths

• Advanced personalisation — custom images with prospect names, personalised video thumbnails, and dynamic landing pages
• Multi-channel sequences combining email, LinkedIn actions, and phone tasks in one workflow
• Strong template library and active community sharing proven sequences and templates
• Good deliverability features including warm-up (via Lemwarm) and sending optimisation
• LinkedIn integration — automated connection requests, messages, and profile visits (requires caution with LinkedIn compliance)
• AI-powered personalisation — automatic first-line generation based on prospect data

Sequencing Capabilities

• Multi-channel sequences (email + LinkedIn + phone + custom tasks)
• Dynamic image and video personalisation embedded in emails
• Conditional workflow steps based on engagement
• A/B testing across channels
• Team collaboration features for managing multiple campaigns
• Personalised landing pages for each prospect

Limitations

• No built-in prospect database — like Instantly, you need a separate data source for lists
• More expensive than alternatives at scale — the per-user pricing adds up quickly for larger teams
• LinkedIn automation carries compliance risk — automated LinkedIn actions can result in account restrictions if not managed carefully
• Complexity in setup — the advanced personalisation features require more time to configure properly
• Learning curve for the multi-channel workflow builder — more complex than Apollo or Instantly

Who It Is Best For

Firms that prioritise creative personalisation and multi-channel sequences and are willing to invest the time to set up advanced campaigns. Lemlist shines when your strategy involves visual personalisation, video outreach, or sophisticated LinkedIn automation.

Pricing

Starts at 59 per month per user for Email Pro. Multi-channel plan at 99 per month per user adds LinkedIn and phone capabilities. Enterprise plan at 159 per month per user adds advanced features and support.

Head-to-Head Feature Comparison

Data and Prospecting

• Apollo.io: Built-in database with 270M+ contacts, intent data, technographics — the clear leader
• Instantly: Lead finder add-on available but less comprehensive than Apollo
• Lemlist: No native database — requires external data source

Email Deliverability

• Apollo.io: Good deliverability features, improving steadily
• Instantly: Best-in-class warm-up, rotation, and deliverability infrastructure
• Lemlist: Good deliverability via Lemwarm, solid but not Instantly's level at high volume

Multi-Channel Outreach

• Apollo.io: Email + phone + LinkedIn tasks within sequences
• Instantly: Email-only (other channels require separate tools)
• Lemlist: Email + LinkedIn + phone in integrated workflows — strongest multi-channel

CRM Integration

• Apollo.io: Deep native integration with HubSpot, Salesforce, Pipedrive — the strongest
• Instantly: Basic CRM integration, improving but not as seamless
• Lemlist: Good CRM integration with major platforms

Personalisation

• Apollo.io: Standard merge fields and custom variables — functional but basic
• Instantly: Standard merge fields — similar to Apollo
• Lemlist: Advanced personalisation with custom images, videos, and landing pages — the clear leader

Pricing Value

• Apollo.io: Best all-in-one value — data + sequencing in one subscription
• Instantly: Best value for high-volume sending — unlimited accounts at low cost
• Lemlist: Premium pricing justified by advanced personalisation features

Our Recommendation for B2B Service Firms

For most B2B service firms, especially those under 20 people, we recommend Apollo.io as the primary platform. The reasoning is straightforward:

1. Less tool sprawl — One platform instead of two or three. Fewer subscriptions to manage, fewer integrations to maintain, fewer logins for your team.

1. Better data flow — Prospect data flows directly into sequences, and sequence activity flows directly into your CRM. No CSV exports, no manual imports, no data gaps.

1. Lower total cost — When you factor in the cost of separate data, verification, and sending tools, Apollo is typically cheaper than the combined alternative.

1. Faster setup — Search, filter, verify, and sequence from a single interface. Your team is productive in days, not weeks.

1. Intent data advantage — Knowing which companies are actively researching your service category is a game-changer for prioritisation and messaging relevance.

When to Add Instantly Alongside Apollo

If you are doing very high volume outbound sales — 500+ emails per day across many domains — consider adding Instantly alongside Apollo:

• Use Apollo for prospecting, enrichment, and building targeted lists
• Export lists to Instantly for high-volume sending with superior deliverability infrastructure
• Keep Apollo as your CRM integration hub for activity logging

This hybrid approach gives you the best of both worlds: Apollo's data and enrichment with Instantly's deliverability at scale.

When Lemlist Might Be the Right Choice

Consider Lemlist if:

• Your outreach strategy relies heavily on visual personalisation (custom images, video)
• You have a strong LinkedIn component to your outbound sales approach
• You already have a reliable data source and do not need Apollo's database
• Your volume is relatively low (under 100 emails per day) and quality per email is your priority

The Integration Play: Building Your Outbound Stack

The best setup for a scaling B2B service firm:

1. Apollo.io — Primary platform for prospecting, data enrichment, and sequencing
2. Your CRM (HubSpot, Pipedrive, or Salesforce) — Central deal management and pipeline visibility
3. Instantly (optional) — High-volume warm-up and sending infrastructure when scaling beyond 500 emails per day
4. Cal.com or Calendly — Meeting scheduling integrated with your CRM

Keep the stack simple. Master one tool before adding another. The biggest mistake we see at MAVEN is firms spreading their team across too many platforms before they have a proven sales process driving the campaigns.

Common Mistakes When Choosing Sequencing Tools

Mistake 1: Choosing Based on Price Alone

The cheapest tool is rarely the best value. Factor in data costs, integration costs, admin time, and most importantly, the results the tool helps you generate. A tool that costs 50 more per month but generates two extra meetings per month is a bargain.

Mistake 2: Over-Investing in Features You Will Not Use

If you are a five-person consultancy, you do not need enterprise-grade features. Choose the tool that matches your current stage and scale up when needed.

Mistake 3: Ignoring Deliverability

Features and data are meaningless if your emails land in spam. Evaluate deliverability infrastructure carefully — warm-up capabilities, sending rotation, bounce management, and domain health monitoring.

Mistake 4: Not Testing Before Committing

Every tool on this list offers a free trial or demo. Test with your actual data, your actual team, and your actual cold email campaigns. Pay attention to the day-to-day experience, not just the feature list.

Get Expert Help With Your Outbound Setup

At MAVEN, we are an official Apollo.io partner, and we have configured outbound systems using all three platforms compared in this guide. We know the strengths and limitations of each tool from hands-on experience, not just feature comparison.

Our 90-day engagement includes full outbound infrastructure setup — tool selection, configuration, domain setup, warm-up, sequence writing, and CRM integration. Check out our services for details.

The tool matters less than the process behind it. But the right tool makes executing that process significantly easier and more efficient. Book a virtual coffee and we will help you choose the right setup for your firm's specific situation, budget, and growth targets.