Unspam Alternative: LitInboxes for Continuous Deliverability Monitoring

Unspam is a genuinely good testing suite. Paste an email, get a spam score in about thirty seconds, see how it renders across dozens of clients, get a heatmap of where attention will land, and check the usual authentication records, with a free tier and a $9 entry plan.

LitInboxes answers a different question. Not “is this email OK?” but “is this sending domain OK?” Every day, without you asking. Deliverability problems rarely announce themselves at send time. The blocklist listing arrives three weeks after your last test. The DKIM record breaks during a DNS migration nobody told you about. A test you have to remember to run cannot catch either.

LitInboxes vs Unspam: the short answer

Unspam tests an email. LitInboxes watches a domain. Most senders eventually want both, and the cheaper one is not automatically the right first purchase.

• Scope. Unspam scores a message, previews how it renders across 50+ clients, and produces attention heatmaps. LitInboxes ingests DMARC aggregate reports, pulls Google Postmaster reputation, watches blocklists and DNS records for drift, and verifies lists. It does not do rendering previews or heatmaps.
• Price. Unspam has a free tier, then $9, $19, and $29/mo by test volume. LitInboxes is $14/mo per monitored domain with a 14-day trial and no free plan.
• Cadence. Unspam answers when you run a test. LitInboxes re-checks every monitored domain every 6 hours and alerts on the change.

Before reading the rest, run a free email health check on your own domain. No account, no test quota.

What Unspam does well

Fast, cheap diagnostics with an unusually generous free tier. Spam scoring that breaks down authentication, reputation, blacklist, and content signals. Rendering previews across 50+ real clients in light and dark mode. AI eye-tracking heatmaps and WCAG accessibility scanning, neither of which we offer. An MCP server so an AI assistant can run tests for you. Free one-off SPF, DKIM, DMARC, and BIMI checkers.

If your job is making an email look right and score well before it goes out, that toolkit is hard to beat at $9/mo.

The trade-off is the shape of the product: it is test-driven and volume-metered. You learn about problems when you remember to test, and quotas reset monthly without rolling over.

Where LitInboxes is different

• DMARC aggregate reports, ingested and parsed: not just “does a DMARC record exist”, but what the reports say about which sources are passing and failing, over time.
• Google Postmaster Tools integration: Gmail’s own verdict on your domain reputation, in the same dashboard.
• Continuous blocklist, reputation, and DNS drift monitoring: SPF, DKIM, DMARC, MTA-STS, and BIMI watched around the clock, with alerts when something changes.
• Email verification built in: syntax → MX → SMTP cascade, 500–50,000 checks/mo by plan.
• Bounce and complaint history: 30 to 730 days of it, depending on plan, so you can see trends rather than snapshots.

Comparison

Capability	Unspam	LitInboxes
Spam / content analysis	Yes, high volume	AI analyses included monthly
Rendering previews across clients	50+ clients, heatmap, accessibility	Not a focus
DMARC record checker	Yes	Yes
DMARC aggregate report ingestion	No	Every plan
Google Postmaster integration	No	Every plan
Continuous blocklist + DNS drift monitoring	Scheduled re-tests	Every plan, with alerts
Email verification	No	Every plan
Bounce / complaint history	No	30–730 days by plan
Free tier	Yes	No, 14-day trial
Entry paid price	$9/mo	$14/mo

Pricing

As of July 2026 (from unspam.email/pricing): a free plan with 10 spam tests and 3 placement tests per month, then Basic $9, Business $19, and Agency $29: each step buying more tests, previews, and heatmaps. Sender accounts are unlimited on every plan, and annual billing saves two months. A white-label plan is quoted on request.

LitInboxes Starter is $14/mo for one domain, fully monitored. Growing is $49/mo for 5 domains with 5,000 verifications and 75 AI spam analyses. Pro is $99/mo for 50 domains with API access and Slack alerts. Every plan starts with a 14-day free trial; there is no free plan.

So Unspam is cheaper to start, and we will not pretend otherwise. The two prices buy different things: theirs buys a bundle of tests, ours buys a domain that is watched between them.

Which should you pick?

Pick Unspam if your work is campaign-shaped: you want to check rendering, run a spam score, see a heatmap before a send, and pay very little (or nothing) to do it.

Pick LitInboxes if your work is domain-shaped: you want DMARC reports actually read, Gmail’s reputation verdict surfaced, blocklists and DNS records watched continuously, and to be told when something breaks instead of discovering it during your next manual test.

Plenty of senders would be well served by both. If you only want one, pick the one that matches the question you keep having to answer.