TrulyInbox vs Warmbox
An independent, review-free comparison compiled by the SaaSTracker editorial team. Both products are profiled in full, and neither can pay for placement here.
The short answer
Editorial assessmentTrulyInbox compared with Warmbox
Warmbox is a straightforward per-mailbox warming service in the same mould as most of the category. TrulyInbox's volume model with unlimited accounts is the structural difference, and it pays off above roughly ten mailboxes. Below that, per-mailbox pricing is simpler and usually cheaper. Compare on your actual mailbox count rather than on headline prices.
Choose TrulyInbox if
Outbound teams and agencies running ten or more sending mailboxes who want warming priced by volume rather than per seat, with API access to automate mailbox provisioning.
Choose Warmbox if
Solo senders, founders, and small teams warming a handful of cold-outreach mailboxes who want a cheap, configurable warming network with basic DNS and blacklist checks, and who either do not need deep placement diagnostics or already get them elsewhere.
Side by side
13 attributes| Attribute | TrulyInbox | Warmbox |
|---|---|---|
| Category | Deliverability | Deliverability |
| Starting price | $0 (Free), then $22 per month billed annually (Starter, $29 monthly) (free plan available) | $15/mo (Solo, billed annually) |
| Pricing model | Freemium subscription priced by total daily warmup email volume, with unlimited connected email accounts on every paid tier. | Flat monthly subscription tiered by number of connected inboxes and daily warm-up volume, with roughly 20 percent discounts on annual billing and custom-quoted plans above 6 inboxes. |
| Free plan | One email account and ten warmup emails a day, permanently free, with basic deliverability tracking and chatbot support. | No |
| Free trial | 7 days on paid plans | No |
| Best for | Outbound teams and agencies running ten or more sending mailboxes who want warming priced by volume rather than per seat, with API access to automate mailbox provisioning. | Solo senders, founders, and small teams warming a handful of cold-outreach mailboxes who want a cheap, configurable warming network with basic DNS and blacklist checks, and who either do not need deep placement diagnostics or already get them elsewhere. |
| Setup time | Fifteen minutes to connect mailboxes and start warming. Three to six weeks of ramping before a mailbox is ready for real sending volume, which is the actual timeline and cannot be shortened by spending more. | Minutes per mailbox: OAuth for Google and Microsoft accounts, SMTP/IMAP credentials for everything else. Meaningful reputation movement takes 2 to 4 weeks of warming, consistent with category norms. |
| Learning curve | Low to operate, higher to use well. The configuration surface is larger than most warming tools, with four strategies, reply rates, schedules, and topic control, and the temptation is to turn everything up. Aggressive settings make traffic look less like correspondence, not more. | Low. Choosing among growth, flat, and random modes is the only real decision; defaults are sensible for a new domain. |
| Platforms | Web application, Google Workspace connection, Microsoft 365 connection, SMTP and IMAP connection | Web app |
| Compliance | GDPR | GDPR-aligned processes (self-reported) |
| Founded | 2023 | 2020 |
| Headquarters | Not publicly disclosed | Not disclosed (distributed team) |
| Ownership | Privately held and unfunded, associated with the team behind SalesBlink | Privately held; no external funding disclosed |
Strengths and limitations
TrulyInbox
Strengths
- Volume-based pricing with unlimited accounts on every paid tier, which makes cost predictable while the sending estate churns.
- Effective per-mailbox cost falls as you scale, reaching around $3.40 a mailbox at fifty, cheaper than most per-seat competitors.
- API access from the $22 entry tier, where most of the category treats it as an enterprise feature.
- Four warming strategies with fine-tuning and configurable reply rates, which is more control than most warming tools expose.
Limitations
- Automated warming is contested practice. It manufactures engagement that does not reflect real correspondence, providers have improved at detecting reciprocal warming networks, and Google has publicly discouraged it. Use it to ramp genuinely new mailboxes, not to rescue unwanted campaigns.
- Network composition and quality cannot be independently verified by a buyer, here or at any warming vendor.
- No seed-list inbox placement testing, so the deliverability score reflects placement of warming traffic inside the network rather than placement of your real campaigns with real recipients.
- No DMARC report monitoring or authentication management of any kind.
Warmbox
Strengths
- Aggressive entry pricing: $15 a month on annual billing undercuts most standalone warming competitors for a single mailbox.
- Three distinct warming strategies (growth, flat, random) plus custom schedules offer more explicit control over the warming curve than many rivals expose.
- Broad connectivity, including consumer providers (Yahoo, iCloud, AOL, Yandex, Zoho) and sending infrastructure (Amazon SES, SendGrid, Mailgun, Brevo), not just Google and Microsoft.
- AI-generated warm-up content reduces the template-fingerprint risk of repetitive warming threads.
Limitations
- No seed-list placement testing, DMARC analytics, or content spam analysis; Warmbox measures only its own warm-up traffic, so diagnosing real-campaign placement requires a second tool.
- Inconsistent network-size claims (35,000+ on the homepage, 10,000+ active on the about page) make the core scale metric hard to trust at face value.
- No free trial or free plan advertised as of this review, so evaluating the product means paying for at least a month.
- Small published ceiling: six inboxes is the largest self-serve plan, and agencies must negotiate custom pricing where competitors publish theirs.
Pricing compared
TrulyInbox
Freemium subscription priced by total daily warmup email volume, with unlimited connected email accounts on every paid tier.
- Free$0
- Starter$22
- Growth$84
- Scale$169
- Scale PlusFrom $407
The volume model is the whole argument, and it is a good one above roughly ten mailboxes. Fifty mailboxes for $169 a month at around $3.40 each undercuts per-seat competitors, the bill stays constant as the estate churns, and API access at the entry tier means an outbound stack can provision warming automatically. Below ten mailboxes the maths reverses and InboxDoctor's $2 to $6 per mailbox is cheaper. What you do not get at any tier is seed-list placement testing, so the deliverability score you see reflects where warming mail lands inside the network rather than where your campaigns land with real recipients, and that distinction matters more than the price difference between vendors.
Warmbox
Flat monthly subscription tiered by number of connected inboxes and daily warm-up volume, with roughly 20 percent discounts on annual billing and custom-quoted plans above 6 inboxes.
- Solo$15
- Start-up$69
- Growth$139
- CustomQuoted
At $15 a month for a single inbox, Warmbox is one of the cheapest credible ways to warm a new domain, and the three-mode strategy system gives more control than most rivals at that price. The value case weakens as mailbox count grows: six inboxes for $139 is more per inbox than Mailivery's unlimited-mailbox tiers or a sequencer's bundled warming, and because Warmbox includes no placement testing, DMARC reporting, or verification, a serious team still budgets for a measurement tool on top. Buy it as a cheap, focused warmer, not as a deliverability platform.
Editorial verdict on each
TrulyInbox
TrulyInbox is the warming tool to buy if you run a lot of mailboxes or a sending estate that changes every month. Pricing by daily volume with unlimited accounts keeps the bill flat while mailboxes come and go, the effective cost falls to around $3.40 a mailbox at fifty, and API access from the $22 entry tier makes automated provisioning practical in a way most competitors reserve for enterprise contracts. The configuration depth, four ramp strategies and adjustable reply rates, is real and should be used conservatively rather than turned up. Two things temper the recommendation. Below ten mailboxes, per-mailbox vendors are simply cheaper. And there is no seed-list placement testing at any tier, so the deliverability score tells you about warming traffic inside a network that is designed to like you, not about your campaigns reaching strangers. Pair it with a placement tester, keep the honest caveat about warming as contested practice in view, and it is a well-shaped product for exactly one job.
Read the full TrulyInbox profileWarmbox
Warmbox is the budget pick among standalone warming networks, and an honest one: it warms mailboxes, gives you real control over the curve, and does not pretend to be a diagnostics platform. For a founder or small team warming one to six mailboxes, the price-to-function ratio is hard to beat, especially with SMTP infrastructure support most cheap warmers lack. But the conflicting network-size claims, the absence of any trial, and the total lack of placement testing mean bigger operations will outgrow it quickly, either toward a bundled platform like Warmy or Mailivery or toward a sequencer with warming built in. Buy it for what it is: a $15 warming appliance, not a deliverability strategy.
Read the full Warmbox profileTrulyInbox profile last reviewed 2026-08-22; Warmbox last reviewed 2026-08-22. Pricing is compiled from public sources and can change without notice. See our methodology.