Plain text or designed HTML? Here is the honest answer — and the exact workflow to make either approach work.

Here is something no one tells you when you search for the best email builder for cold outreach: most results are comparing the wrong tools. The top-ranking guides review cold email sending platforms — Instantly, Lemlist, Saleshandy, Apollo — and call them builders. They are not. A sequencing tool schedules and sends. An email builder designs the actual email. These are two different layers of the cold outreach stack, and confusing them is one of the most expensive mistakes a sales or marketing team can make.

The real question is not which sending platform has the slickest UI. It is: when does your cold outreach actually need a designed, branded HTML email — and when should you send a plain-text message that looks like it came from a human? Get that choice wrong and you are either torpedoing your deliverability with over-designed templates, or sending forgettable plain emails when your brand reputation could be doing the heavy lifting.

This guide cuts through both layers. We cover the design-vs-plain-text decision framework, review the actual email builders that matter for cold outreach (Stripo earns the top spot), and walk through the exact HTML export workflow so your beautifully built template actually lands in an inbox — not the promotions tab.

The Two-Layer Cold Outreach Stack (Most Guides Miss This)

Before comparing any tools, you need to understand that cold outreach has two completely separate technical layers that require two completely different types of software.

Layer 1 — The sending platform. This is what Instantly, Lemlist, Saleshandy, and Apollo are. They handle sequences, follow-ups, inbox warm-up, domain rotation, and deliverability infrastructure. They are the engine that decides when emails are sent and from which sender address.

Layer 2 — The email builder. This is what Stripo, BEE Pro, and Beefree are. They are design environments where you compose the visual and structural content of the email itself — drag-and-drop blocks, brand colors, responsive layouts, and HTML export.

Most cold emailers only think about Layer 1. They pick a sequencing tool, write copy directly inside it, and call it a day. That works fine for plain-text 1-to-1 prospecting. But the moment your outreach needs to look polished — a partnership pitch to an enterprise prospect, a co-marketing proposal with your logo and theirs, a product demo invitation with a visual CTA — plain text stops doing the job.

Plain Text vs. HTML: The Deliverability Decision Framework

Every cold email expert says plain text wins on deliverability. That is true — for a specific type of cold email. It is not universally true, and applying the rule blindly costs you opportunities.

When plain text is the right choice

If your goal is a 1-to-1 prospecting email to a single named recipient — asking for a call, pitching a partnership, booking a meeting — plain text is almost always the correct format. Spam filters treat heavy HTML, multiple images, and tracking pixels as markers of mass marketing campaigns. A message that visually resembles a personal email from a colleague gets treated differently by ISPs and by human recipients.

• Reply rate is the primary metric → plain text wins

• Volume is high (hundreds of sends per day) → plain text protects domain reputation

• Recipient is cold (never heard of your brand) → plain text lowers guard

• You are using inbox warm-up and rotation → avoid anything that fingerprints as bulk

When designed HTML email is the right choice

Designed cold email makes sense when brand credibility does part of the selling for you. Enterprise sales, partnership outreach, investor communications, and high-value prospect sequences often benefit from a template that signals professionalism before the recipient reads a word.

• Recipient is warm (visited your site, attended a webinar, met at a conference)

• You are sending at lower volume to highly targeted, high-value accounts

• Brand recognition is a conversion lever (well-known company logo, established product)

• Email contains a visual element that explains the value proposition better than text

• You are sending from a marketing domain separate from your cold outreach domain

How We Evaluated These Email Builders

To be clear about what we are rating here: we are evaluating email design and building tools — not cold outreach sending platforms. The criteria we used reflect what matters when building templates specifically for the cold outreach context.

• Template library for sales and cold email use cases

• HTML export quality and compatibility with major cold email senders

• Deliverability-friendly design options (lightweight HTML, minimal image blocks)

• Personalization variable support (merge tags, dynamic fields)

• Team collaboration for marketing + sales workflow alignment

• ESP and sending platform integrations

• Pricing relative to output quality

Best Email Builder for Cold Outreach: Tool Breakdown

1. Stripo — Best overall for cold outreach templates

Best for: Marketing teams, agencies, and any team running brand-consistent cold outreach at scale.

Pricing: Free plan available. Paid plans from $15/month. Agency and white-label plans available.

Stripo is the strongest email builder for cold outreach precisely because it was not built exclusively for cold email. It was built for professional email production — which means its output is clean, responsive, and compatible with virtually every sending platform on the market. With over 1,650 ready-made templates including a dedicated cold email category, Stripo gives sales and marketing teams a head start without requiring design skills.

The drag-and-drop editor is fast and intuitive, but the real advantage for cold outreach is the HTML export engine. Stripo generates tight, lightweight HTML that does not bloat your email with unnecessary code — a critical factor when every extra div and table tag increases your spam score footprint. The direct integrations with 90+ ESPs and sending tools mean you can push your template directly into your outreach tool without touching code.

Stripo also handles the collaboration layer that most cold outreach workflows miss. When marketing builds the template and sales personalizes it, having a shared module library and role-based access prevents the version chaos that happens when reps are editing raw HTML themselves.

• 1,650+ templates including cold email and sales outreach category

• 90+ ESP integrations including direct push to Mailchimp, HubSpot, and others

• Clean HTML export with minimal code overhead — better deliverability baseline

• Module library for consistent signatures and CTA blocks across all reps

• Free plan available for solo users and testing

• AMP email support for interactive elements (advanced use cases)

2. BEE Pro — Best for agency and multi-brand cold outreach

Best for: Agencies managing cold outreach templates for multiple clients across different brands.

Pricing: From $30/month. No free plan; 15-day free trial.

BEE Pro is the closest competitor to Stripo for professional cold outreach template production. Its brand management features — multiple brand workspaces, locked brand blocks, and role-based content controls — make it the strongest option for agencies running outreach campaigns for several clients simultaneously. The HTML export is clean and compatible with all major sending platforms.

Where BEE Pro falls short for cold outreach is the absence of a free plan and the lack of the direct ESP integrations that Stripo offers. You are always exporting a ZIP file and manually importing, which adds friction to the builder-to-sender workflow. For in-house teams managing a single brand, the higher price point is harder to justify against Stripo.

• Strong brand management for multi-client agency workflows

• 1,200+ templates with professional-grade design quality

• Clean HTML output compatible with cold email senders

• No direct ESP integrations — manual ZIP export only

• No free plan — entry cost is higher than Stripo

3. Beefree — Best free option for individual senders

Best for: Freelancers and small teams that need a free email builder for occasional cold outreach campaigns.

Pricing: Free plan available. Paid plans from $15/month.

Beefree (the standalone product, separate from BEE Pro) is the strongest free email builder option for cold outreach. The free plan gives access to a solid template library and clean HTML export — enough for a freelancer or small sales team that sends occasional outreach campaigns and needs a polished template without a monthly cost.

The trade-off is the feature ceiling. Beefree's collaboration tools, integration options, and advanced personalization features are significantly thinner than Stripo's. As your outreach volume or team size grows, you will hit limitations that push you toward an upgrade. Stripo's free plan is also generous, making the comparison between the two free tiers worth doing before committing.

• Generous free plan with HTML export included

• 800+ templates covering basic cold email use cases

• Good output quality for the price point

• Limited ESP integrations and collaboration features

• Better for occasional use than high-volume outreach operations

4. HubSpot Email Builder — Best for CRM-integrated cold outreach

Best for: Teams already in the HubSpot ecosystem who want native CRM-linked cold email templates.

Pricing: Included in HubSpot Marketing Hub from $20/month. Free plan available with limitations.

HubSpot's email builder is not a standalone product — it only matters if your team is already using HubSpot CRM. Within that ecosystem, it is genuinely powerful for cold outreach because templates connect directly to contact properties, sequences, and pipeline data. Personalization tokens pull live from the CRM, which removes the manual merge-tag setup required in other tools.

Outside the HubSpot ecosystem, the builder has limited value for cold outreach. You cannot export your templates to use in other sending tools, and the design flexibility is narrower than Stripo or BEE Pro. If you are evaluating tools from scratch, the lock-in cost matters.

• Native CRM integration with contact property tokens

• Works seamlessly within HubSpot Sequences for cold outreach

• Limited export options — templates stay inside HubSpot

• Less design flexibility than dedicated email builders

The Builder-to-Sender Workflow: Stripo to Your Cold Email Tool

This is the section no competitor covers — and it is the practical step where most teams get stuck. You have built a beautiful cold email template in Stripo. Now what? Here is the exact workflow to get it into your sending platform without breaking the design or damaging deliverability.

Step 1: Build a deliverability-friendly template in Stripo

Before you export anything, apply these cold-outreach-specific design rules inside the Stripo editor:

• Maximum 2 images — ideally 1 (logo or single visual CTA)

• No background images — they render poorly and increase spam scores

• Single-column layout — more readable and less spammy than multi-column

• One primary CTA link — avoid multiple hyperlinks in the body

• Include a plain-text fallback version in Stripo's HTML/plain text toggle

• Use web-safe fonts (Arial, Georgia, Verdana) — custom fonts break in most email clients

Step 2: Export your HTML from Stripo

In Stripo, go to Export and select your destination. You have two options depending on your sending tool:

Option A — Direct integration (recommended): Stripo has direct push integrations with Mailchimp, HubSpot, Campaign Monitor, and many others. Select your connected ESP and push directly. The template appears in your sending tool account without any manual file handling.

Option B — HTML file export: Download the HTML file from Stripo's Export menu. This is the option you need for tools like Instantly, Lemlist, Saleshandy, and Smartlead, which do not have native Stripo integrations.

Step 3: Import into your cold email sender

The import process varies by tool, but the pattern is consistent:

Instantly: In your campaign, go to Email content, select HTML mode, and paste your exported code. Instantly renders the HTML and applies it as the campaign template.

Lemlist: Create a new email step in your sequence, click the code icon to switch to HTML mode, and paste. Lemlist supports custom HTML with its standard personalization variables.

Saleshandy: In the email compose window, switch to HTML view and paste your code. Saleshandy renders the preview before sending.

Step 4: Add personalization variables

After importing, replace your placeholder text with the merge variables your sending tool uses. Stripo supports custom variable placeholders during design — use the same format your sending tool expects (e.g. {{first_name}} for Instantly, {first_name} for Lemlist) so they survive the export and do not need manual replacement.

Cold Outreach Sending Platforms: What They Are (and Are Not)

Since most SERP results confuse email builders with sending platforms, here is a brief orientation on the tools that handle the sending layer. These are not email builders — they do not design your template. But they are what your Stripo-built HTML gets loaded into.

None of these tools replace an email builder for template design. They accept HTML input and handle the sending infrastructure — that is their job. Stripo handles the design layer above them.

Cold Outreach Email Template Best Practices

Regardless of which builder or sender you use, these fundamentals determine whether your cold emails get replies or get ignored.

Keep the template lightweight

Every extra HTML element adds to your spam footprint. A cold email template in Stripo should weigh under 50KB ideally. Strip everything decorative — background images, gradient fills, decorative dividers, multiple columns — unless each element is carrying real information.

Write for the plain-text fallback

Always configure the plain-text version of your email in Stripo. ISPs check whether the plain-text and HTML versions of your email match. A mismatch is a spam signal. Stripo generates a plain-text version automatically from your HTML, but review it to make sure it reads naturally.

One goal, one CTA

Cold emails with multiple links and multiple calls to action confuse recipients and confuse spam filters. Your Stripo template should have one primary action — a calendar link, a reply prompt, or a single asset download. Everything else is noise.

Test before you send

Export your Stripo template to a tool like Mail-Tester or GlockApps before adding it to your sequence. These tools score your email against spam filters and identify HTML elements that are causing deliverability risk. Fix issues in Stripo before deploying.

Use Stripo's mobile preview

Over 50% of B2B emails are opened on mobile. Stripo's built-in mobile preview and conditional content features let you verify that your cold email template is readable on a 375px screen before it goes out. A template that breaks on iPhone is a wasted send.

Pricing Comparison: Email Builder Costs for Cold Outreach

For pure cold outreach template production, Stripo's free plan is the most practical entry point. Five HTML exports per month covers low-volume outreach, and the $15 paid plan removes all limits for active campaigns.

Frequently Asked Questions

What is the best email builder for cold outreach?

Stripo is the best email builder for cold outreach. It combines the largest template library for sales email use cases, the cleanest HTML export for deliverability, and direct integrations with 90+ sending platforms. Its free plan makes it accessible for any team testing designed cold email templates.

Should cold emails use HTML or plain text?

It depends on your outreach type. Plain text wins for high-volume prospecting to cold contacts because it looks personal and avoids spam signals from heavy HTML. Designed HTML works for lower-volume, higher-value outreach to warmer prospects where brand credibility matters. Use an email builder like Stripo to build lightweight, deliverability-conscious HTML when you need it.

Can I use Stripo templates in Instantly, Lemlist, or Saleshandy?

Yes. Stripo exports clean HTML that you can paste directly into the HTML editor of any cold email sending platform. Stripo also has direct integrations with many ESPs, but for tools like Instantly and Lemlist, the HTML export route works seamlessly. Add your personalization variables after importing.

Does HTML email hurt cold email deliverability?

Poorly built HTML does — specifically heavy files, multiple images, external font imports, and many tracking pixels. Clean, minimal HTML from a tool like Stripo does not meaningfully hurt deliverability compared to plain text, especially when paired with proper domain authentication (SPF, DKIM, DMARC) and inbox warm-up.

What is the difference between an email builder and a cold email tool?

An email builder (Stripo, BEE Pro, Beefree) is a design environment where you compose the visual layout of your email and export HTML. A cold email tool (Instantly, Lemlist, Saleshandy) handles sending infrastructure — sequences, follow-ups, inbox rotation, and deliverability. In a professional cold outreach setup, you use both: build in Stripo, send via your outreach tool.

Is there a free email builder for cold outreach?

Yes. Stripo's free plan allows 5 HTML exports per month, which covers most low-volume cold outreach use cases. Beefree also offers a free plan with unlimited exports but fewer templates and integrations. Both are legitimate starting points before committing to a paid plan.

Final thoughts

The best email builder for cold outreach is the one that gives you the cleanest HTML, the widest integration options, and the template library to move fast. Stripo wins that comparison clearly. But the bigger insight from this guide is that the builder is only half the stack. Your template design lives in Stripo; your deliverability infrastructure lives in your sending platform. Get both layers right and designed cold email stops being a liability and starts doing real conversion work.

Start with Stripo's free plan, pick a cold email template from the sales category, apply the deliverability-friendly design rules in this guide, export the HTML into your sender of choice, and test before you send. That workflow consistently outperforms both pure plain-text outreach and heavy HTML campaigns.

Author: Antony — independent email design researcher and founder of vallkatesearch.com