TL;DR: The best Warmforge alternatives in 2026 are Warmy, MailReach, Instantly, Lemwarm, Warmbox, Warmup Inbox, and Mailivery. Warmy ranks first for teams that need warm-up plus deliverability monitoring in one platform. MailReach and Instantly fit spam-testing and all-in-one outbound needs, and Warmup Inbox is the lowest-cost entry point.
Why look for a Warmforge alternative
Since November 2025, Gmail has enforced its email sender guidelines with permanent rejections for non-compliant mail, and Microsoft and Yahoo have tightened their own rules in step. For anyone running cold outreach, that raised the cost of sending from a cold or poorly warmed domain. A warm-up tool is now table stakes, and Warmforge is one of the first tools senders reach for.
Warmforge is the warm-up and deliverability product in the Salesforge family, alongside Mailforge and Primeforge. It runs AI-written warm-up emails, checks mailbox health, and offers inbox placement tests. Pricing is slot-based, and it comes free with any Salesforge subscription, which makes it an easy default for teams already inside that ecosystem.
The reasons to look elsewhere are usually straightforward. You may not use Salesforge, so the bundled value does not apply. You may want deeper monitoring than warm-up plus periodic placement tests. Or you may want a platform that treats deliverability as an ongoing discipline.
Warmy is an AI-driven email warm-up and deliverability platform that combines automated warm-up with Google Postmaster data, domain-level health monitoring, and hands-on expert support. Run a free email deliverability test to see where your domain stands before you commit to a tool.
Comparison table
Here is how the seven alternatives stack up against Warmforge on the points that matter most.
| Tool | Key difference vs Warmforge | Starting price | Best for |
|---|---|---|---|
| Warmy | Adds a full deliverability suite (Google Postmaster data, domain-level monitoring, dedicated expert) on top of AI warm-up | Custom quote; 7-day free trial | Teams that want warm-up plus deliverability visibility |
| MailReach | Standalone warm-up with built-in spam and inbox placement testing, flat per-inbox pricing | $25/inbox/mo ($20 annual) | Warm-up plus repeatable inbox tests |
| Instantly | Bundles unlimited warm-up inside a full cold email sending platform | $47/mo ($37.60 annual), unlimited inboxes | All-in-one outbound at high volume |
| Lemwarm | Warm-up built into the lemlist sending suite; free for lemlist subscribers | $29/inbox/mo ($24 annual); free with lemlist | Existing lemlist users and solo senders |
| Warmbox | Simple, automated standalone warm-up with AI-written emails | $19/mo (1 inbox); from $15 annual | Hands-off warm-up at small to mid scale |
| Warmup Inbox | Lowest-cost standalone warm-up, simpler monitoring | $15/inbox/mo (annual) | Budget-conscious solo senders |
| Mailivery | Flat pricing with unlimited mailboxes under a daily volume cap | $29/mo, unlimited inboxes | Warming many inboxes on a fixed budget |
Prices verified on each vendor’s own pricing page in July 2026. Warmy pricing is quote-based in 2026; the historical entry point is shown for reference.
The 7 best Warmforge alternatives
1. Warmy (best overall)
Key features: AI warm-up engine (Adeline) across 30-plus languages, up to 5,000 warm-up emails per day, Google Postmaster Tools integration, a Domain Health Hub with numeric health scores across authentication, blacklist, and placement data, The Adder and Warmup With Clicks for spam recovery and Gmail Promotions placement, a seed list that reaches providers like Klaviyo, Mailchimp, and Shopify, plus free Email Deliverability Test, Template Checker, and SPF and DMARC generators.
Best for: Teams and agencies that want warm-up plus continuous deliverability visibility and human support in one platform.
Pros:
- Broadest feature set in the category, with real Postmaster data rather than estimates.
- Free diagnostic tools and a dedicated deliverability consultation on every plan.
- 7-day free trial with no credit card required.
Cons:
- Per-inbox economics run higher than budget warm-up tools.
- List pricing is no longer public, so you book a demo for a quote.
Pricing: Custom, volume-based pricing in 2026, with a historical entry point around $49 per inbox per month. Annual billing has been offered for roughly two months free. A 7-day free trial is available with no credit card.
2. MailReach
Key features: AI warm-up with human-like activity, built-in spam and inbox placement testing, a deliverability score, blacklist and authentication checks, and SMTP support for Gmail, Google Workspace, Outlook, and Microsoft 365.
Best for: Cold email teams that want warm-up and repeatable placement tests in a single subscription.
Pros:
- Warm-up and spam testing bundled in one plan.
- Per-inbox price drops as you add mailboxes.
- Strong reputation and review scores in the category.
Cons:
- No free trial for the warm-up feature.
- Multi-mailbox pricing is not fully published on the site.
- It will not send your campaigns; you still need a sending tool.
Pricing: $25 per inbox per month for 1 to 5 mailboxes, dropping to $19.50 (6 to 20), $18 (21 to 50), and $16 (51-plus). Annual billing is about 20 percent off.
3. Instantly
Key features: A full cold email sending platform with unlimited email accounts and unlimited warm-up bundled in, a large warm-up network, a unified Unibox for managing replies across accounts, plus sequences, A/B testing, and analytics.
Best for: High-volume outbound teams that want sending and warm-up in one tool rather than a standalone warmer.
Pros:
- Unlimited inboxes and unlimited warm-up on every plan.
- Volume-based pricing that does not charge per seat.
- 14-day free trial on Outreach plans.
Cons:
- Warm-up is not sold separately, so it fits only if you also send through Instantly.
- The lead database and CRM are separate paid products.
Pricing: Growth $47 per month ($37.60 annual), Hypergrowth $97 per month, Light Speed $358 per month, and Enterprise custom.
4. Lemwarm (by lemlist)
Key features: Automated warm-up with human-like opens and replies, authentication checks for SPF, DKIM, DMARC, and MX records, deliverability reports, and spam-risk alerts across a wide warm-up network. The Smart plan adds template testing and industry-targeted warm-up.
Best for: Existing lemlist users and solo senders who want straightforward warm-up.
Pros:
- Free for active lemlist subscribers.
- Simple setup and tight integration with lemlist sending.
Cons:
- Per-inbox pricing scales linearly as you add mailboxes.
- Diagnostics are lighter than dedicated deliverability platforms.
- Daily volume on the entry plan is capped.
Pricing: Essential $29 per inbox per month ($24 annual) and Smart $49 per inbox per month ($40 annual). Free with an active lemlist subscription.
5. Warmbox
Key features: Automated warm-up with AI-written emails, a warm-up network spread across many countries, multi-provider support for Gmail, Outlook, and SMTP, deliverability monitoring, and spam testing across major providers.
Best for: Teams that want hands-off, automated warm-up at small to mid scale.
Pros:
- Simple setup with AI-generated warm-up content.
- Deliverability monitoring included on paid plans.
Cons:
- No free trial.
- Flat-tier pricing does not discount per inbox as you grow.
- Analytics are simpler than category leaders.
Pricing: Solo $19 per month (1 inbox), Start-up $79 per month (3 inboxes), and Growth $139 per month (6 inboxes). Annual billing starts around $15.
6. Warmup Inbox
Key features: Automated warm-up across a network of real inboxes, provider-specific warm-up options, deliverability reporting, and a quick setup.
Best for: Budget-conscious solo senders who need simple standalone warm-up.
Pros:
- One of the lowest entry prices in the category.
- Fast setup and a 7-day free trial.
Cons:
- Reply rates and daily volume are capped by plan.
- No spam or inbox placement testing at any tier.
- Per-inbox cost climbs quickly past a few mailboxes.
Pricing: Basic $15 per inbox per month on annual billing ($19 monthly), Pro around $49 per month for 3 inboxes, and Business around $99 per month for 7 inboxes.
7. Mailivery
Key features: AI warm-up priced by daily volume with unlimited connected mailboxes, blacklist monitoring across many lists, and email verification credits included.
Best for: Teams warming many inboxes that want flat, predictable pricing.
Pros:
- Unlimited mailboxes under each plan’s daily cap.
- Flat pricing that does not scale per inbox.
- 7-day free trial.
Cons:
- Caps are on daily warm-up volume, so heavy senders can outgrow a tier.
- Monitoring is lighter than a full deliverability suite.
Pricing: Starters $29 per month, Professional $79 per month, and Business $199 per month, each with unlimited mailboxes within the plan’s daily volume cap.
How to choose a Warmforge alternative
Match the tool to how you send, not to a feature checklist.
- You want warm-up plus real monitoring: Warmy is the strongest fit, since it treats deliverability as an ongoing discipline rather than a background task. See the Warmy platform for the full feature set.
- You only need warm-up and placement testing: MailReach covers both in one subscription.
- You already send through a dedicated platform: Instantly bundles warm-up, and Lemwarm is free with lemlist, so either can remove a separate line item.
- Budget decides it for one or two inboxes: Warmup Inbox and Warmbox Solo start lowest.
- You warm many inboxes and want flat pricing: Mailivery keeps the monthly cost predictable.
| Pro Tip: Warm-up cannot fix a broken foundation. Confirm SPF, DKIM, and DMARC are correct and your list is clean before you start, or you will warm a domain that still fails on authentication. Warmy’s free SPF and DMARC generators let you verify records first. |
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Conclusion
Warmforge is a reasonable, low-cost warm-up tool, and it is an easy call for Salesforge users. Once your priority shifts from running warm-up in the background to protecting inbox placement week after week, a platform with Postmaster data, domain-level monitoring, and expert support does more for your sender reputation. Warmy brings those pieces together with AI warm-up at the center.
Start your free trial and take control of your deliverability. Try Warmy free.
