Are the prices on this site current?

They are what the vendor published on the date shown in the ledger. Vendors change plans without notice, so treat the date as a freshness indicator and use the link to the vendor's own page before you buy. If you find a difference, tell us and we will update the registry.

Are the placement reports on this site real?

No. Every sample report on WhichWarmup was written by us to demonstrate how to read one, and each carries a fictional label where it appears. No real domain, sender or result is shown anywhere on the site.

Why is one list verification tool missing?

Because its site refused our request and we have no dated reading of its pricing. We would rather leave a gap than publish a figure we could not source.

Source Ledger | Every figure on WhichWarmup and where it came from

Vendor pages behind every figure

The site holds one entry per tool. Every price table, cost ladder and comparison on WhichWarmup is generated from these entries, so this table is not a summary of our sources: it is the source.

Source ledger
Tool	What we record	Source we read	Last read	Caveat on the source
MailReach	Plans, list prices and published limits	www.mailreach.co/pricing	16 September	The pricing page ran a seasonal promotion (20% off the first 30 days of warming) when checked; confirm the current per-mailbox rate on the official page.
Warmup Inbox	Plans, list prices and published limits	www.warmupinbox.com/pricing	16 September	Pricing is per inbox; annual billing is advertised at 20% off. A 7-day free trial is offered without a card.
Instantly	Plans, list prices and published limits	instantly.ai/pricing	16 September	Warmup is bundled into the sending plans, not sold separately; annual billing lowers the monthly rate.
GlockApps	Plans, list prices and published limits	glockapps.com/pricing/	16 September	Plans are sold by spam test credits; annual billing is advertised at about 30% off. A free tier includes 2 tests.
ZeroBounce	Plans, list prices and published limits	www.zerobounce.net/services/pricing/	16 September	One credit verifies one email; unknown results and duplicates are not charged. Credits are sold pay-as-you-go or via a monthly subscription.

How to read the last-read date. It is the day we opened that vendor page and wrote down what it said. It tells you how fresh the figure is. It does not promise the vendor has not changed its pricing since, which is why every price table on the site also links straight to the vendor's page.

Other sources this site relies on

Some pages rest on documentation rather than on pricing. These are the other publishers we read, and what we take from each.

Documentation sources
Source	What we take from it	Used on
Google Workspace sending limits	Published per-user daily recipient limits and what counts against them	Workspace and Microsoft 365
Google third-party access and revocation	How an app's mailbox access is granted, reviewed and revoked	Pilot protocol, Switching tools
Exchange Online limits	Published recipient rate and message limits for Microsoft 365 mailboxes	Workspace and Microsoft 365
RFC 7489, DMARC	What a DMARC policy is and what an aggregate report contains	Reading a placement test

What has no source, and why

Three kinds of statement on this site do not come from a source, and it would be dishonest to let them sit in a table as if they did.

Invented on purpose, and labelled

Every sample placement report and sample client report. We wrote them to show you how to read one. Each carries a fictional label in its own header, and none describes a real domain, a real sender or a real result.
The worked examples in the cost calculator. They use registry prices, but the mailbox and sender counts are illustrations, not observations.

Judgement, and presented as ours

Which tool suits which diagnosis, and when you should buy nothing. That is reasoning from the sourced facts, not a measurement.
Which criteria matter in a comparison, and the order we put them in.
Which vendor phrasing we consider indefensible in front of a client.

And one thing we could not source at all. We tried to add a second list verification vendor to the registry and its site refused our request, so we have no dated reading of its pricing. It is absent from the site rather than estimated from memory or from a third-party summary. That is the general rule here: an unsourced figure does not get published in a weaker form, it does not get published.

No measurement of our own

The most important line in this ledger is the empty one. WhichWarmup has run no deliverability test, no warmup campaign and no placement measurement. We hold no mailboxes, we have not subscribed to these tools, and we have nothing in the way of first-hand performance data.

That is why no page here ranks tools on effectiveness, and why no page claims a tool improved anything. Where the site tells you how to obtain evidence, it hands you a protocol to run yourself, with a control group and a list of the variables that will otherwise fool you. If that ever changes, the test and its raw results will appear in this ledger before any conclusion drawn from them appears anywhere else.

The source ledger