Warmerly
A placement test to up to 4 targets; accuracy is limited, as there is no dedicated seed list yet.
Warmerly
Folderly
One-to-one · Inbox placement tests
Inbox placement tests
One row, in depth: what each tool does, the verified numbers, and who each suits.
Folderly details read from its pricing page, overview, home page, product sites, terms, privacy policy and help centre on 21 October 2026.
Warmerly
A placement test to up to 4 targets; accuracy is limited, as there is no dedicated seed list yet.
Folderly
Inbox Insights tests Gmail, Outlook and Yahoo: 2 free tests a month, or 100 a month for $79.
The short answer
Inbox placement tests, in one look.
Warmerly runs a placement test to up to 4 targets, but with no dedicated seed list yet its accuracy is limited, and the app says so. Folderly's Inbox Insights tests where a message lands in Gmail, Outlook and Yahoo, with 2 free tests a month or 100 a month for $79. Folderly is ahead here. Last checked 22 October 2026.
FolderlyFolderly ahead on this row
Inbox Insights tests Gmail, Outlook and Yahoo: 2 free tests a month, or 100 a month for $79.
The picture
Drawn side by side.
How a test runs
As each describes it
WarmerlyFolderly
Warmerly
Send one messageWait 30 or 90 secondsRead folders over IMAPScore each result
Folderly
Choose a mailboxChoose a templateAutomated testPlacement report
Folderly names Gmail, Outlook and Yahoo. It does not say how placement is measured.
On screen
What it looks like.
WarmerlySample data
How Warmerly does it
Warmerly, in detail.
A built-in test, honest about its limits.
01
What a test does
It sends one message to up to 4 targets, waits 30 seconds on demand or 90 in the daily sweep, checks Inbox, Promotions, Spam and Junk over IMAP and scores each result.
Warmerly product, checked 21 October 2026
02
No dedicated seed list yet
Real measurement needs seed mailboxes at Gmail, Outlook or Yahoo. The doc's check on 2026-10-15 found none in production, so every test falls back to Warmerly's own mailboxes.
Warmerly product, checked 21 October 2026
03
Limited accuracy is shown
A fallback test scores close to 100 whatever the sender's real result, so the app labels it Limited accuracy and never uses it to change health.
Warmerly product, checked 21 October 2026
04
Allowances
Free has 3 placement tests a month, Starter 5, Growth 25 and Agency 100.
Warmerly product, checked 21 October 2026
05
How a result becomes a score
Each target scores inbox 100, promotions 60, spam 10 and missing 0, and the test averages them. The targets are up to 2 on the sender's own provider and up to 2 on another.
Warmerly product, checked 21 October 2026
06
A daily sweep with a cap
A daily job tests at most 5 mailboxes per run and skips any mailbox tested in the last 24 hours. A run left in the running state for over 20 minutes is marked failed.
Warmerly product, checked 21 October 2026
07
Running one from the dashboard
A test from the Health tab takes about 45 to 60 seconds with four targets. It is stored even if you close the browser, and the page shows staged progress while it runs.
Warmerly product, checked 21 October 2026
08
Degraded runs never touch health
A fallback run is flagged as degraded. It never writes a health score, never feeds the spam score or the sending allowance, and a trend is shown only when the last two tests are the same kind.
Warmerly product, checked 21 October 2026
09
What production looked like on 15 October 2026
The doc records that the table of dedicated seed mailboxes was still empty in production, and that the only non-degraded rows were demo data. No real Gmail or Outlook placement had been measured by a customer test.
Warmerly product, checked 21 October 2026
10
A second target source, switched off
A source that uses consenting warmup-network mailboxes of other customers is built behind a switch that is off by default. It reads only the Message-ID header, caps use at 2 per customer a day, and has not been run against a real Gmail or Outlook mailbox. Whether Gmail shows Promotions as an IMAP folder is unproven.
Warmerly product, checked 21 October 2026
How Folderly does it
Folderly, in detail.
A placement test product across three providers.
01
Gmail, Outlook and Yahoo
Its page says you can find out where your emails land in Gmail, Outlook and Yahoo. You choose a mailbox and an email template to start the automated test.
folderly.com/email-deliverability-test · read 22 October 2026
02
A free tier and a paid tier
Inbox Insights is $0 a month for 2 tests, or $79 a month for 100 tests, or $799 on its yearly option with a Save 15% label.
folderly.com/pricing · read 22 October 2026
03
Tests apply to an account
Its page says the number of tests applies to an account, not each mailbox. Plans range from 100 to 5000+ tests.
folderly.com/email-deliverability-test · read 22 October 2026
04
Daily monitoring and a report
The overview page lists daily inbox monitoring and a detailed email placement report across major email providers.
folderly.com/overview · read 22 October 2026
05
Pulse monitors placement over time
Pulse lets you specify an inbox rate, mailbox and template, and choose the providers to monitor.
folderly.com/email-deliverability-monitoring · read 22 October 2026
06
Six listed test sizes
The page lists test counts of 100, 250, 500, 1,000, 2,500 and 5,000 and more, and says a free placement test is offered. The monthly price shown on the pricing page is $79 for 100 tests.
folderly.com/email-deliverability-test · read 22 October 2026
07
What the report and table list
The page lists collecting email placement statistics, a shareable test report, single-click mailbox connection, DNS records check and setup support, and blacklist checks with delisting guides. Which column each tick belongs to is shown as images, so we treat them as listed claims only.
folderly.com/email-deliverability-test · read 22 October 2026
08
Inbox and Promotions are reviewed separately
The overview lists reviewing inbox and Promotions placement, and says to review where test emails land and use the results to investigate deliverability issues.
folderly.com/overview · read 22 October 2026
09
Connects by API and SMTP
Folderly integrates via API and SMTP with major email service providers and custom providers, and says it works with any sending architecture. Pulse names Gmail and Outlook.
folderly.com/email-deliverability-monitoring · read 22 October 2026
10
Flash tests with seed inboxes
Flash says it returns a setup grade now and live inbox placement only when seed inboxes report. The page's own test addresses include one on folderly.com, not on Gmail.
flash.folderly.com · read 22 October 2026
What Folderly does not say
We looked, and found no statement on these. That is about its published pages only, not about the product.
- How placement is measured
- The sample size or number of seed inboxes
- How often scheduled tests run
- How accurate the results are
- How long a test takes
- How often a test can be run
- What the sender score is drawn from
- Whether the free test uses the same seeds as paid tests
Where the sources disagree
We report each version rather than pick one.
- The pricing page shows $799 for the yearly option without a period. The test page says $799 per year with a saving of $149, which fits $79 over 12 months ($948 less $799).
The numbers
Only what we could verify.
| Measure | Warmerly | Folderly |
|---|---|---|
| Inbox placement tests | A placement test to up to 4 targets; accuracy is limited, as there is no dedicated seed list yet. | Inbox Insights tests Gmail, Outlook and Yahoo: 2 free tests a month, or 100 a month for $79. |
| Providers tested | Up to 4 targets | Gmail, Outlook and Yahoo |
| Free tests a month | 3 on Free | 2 on Inbox Insights |
| Tests on a paid tier | 100 on Agency | 100 for $79 a month |
| Score scale | Inbox 100, promotions 60, spam 10 | Not stated |
| Cost of one test at the paid tier | Included in the plan allowance | $0.79 (79 / 100) |
| Yearly price for 100 tests a month | Included in the plan allowance | $799, about $66.58 a month |
| Tests a month on Starter | 5 | Not applicable |
| Duration of a test | About 45 to 60 seconds | Not stated |
| Dedicated seed mailboxes live | None at last check, 15 October 2026 | Not stated |
In practice
What it means for you.
Our reading of the facts above. Not a promise, and not the only reasonable reading.
Keep a separate tester if placement is your main worry
Until Warmerly has a dedicated seed list, a tool built for placement gives a firmer answer.
Ask how Folderly measures it
Its pages do not say how placement is measured or how large the sample is.
Reading a Warmerly score
With 4 targets, if 2 land in the inbox, 1 in promotions and 1 in spam, the score is (100 + 100 + 60 + 10) / 4 = 67.5. A result from a fallback run is labelled Limited accuracy and is not used for health.
A year of Folderly tests against monthly billing
Twelve months at $79 is $948. The yearly option is $799, a saving of $149, or about 15.7% by arithmetic, in line with the Save 15% label. At 100 tests a month, $79 is $0.79 a test.
How long the sweep takes to cover a fleet
The daily sweep tests at most 5 mailboxes per run. With 25 mailboxes, a given one is reached every 5 days at the fastest. On-demand tests from the Health tab are not limited by the sweep.
Two free tests or three
Warmerly's Free plan includes 3 tests a month and Folderly's Inbox Insights free tier 2. The count matters less than what the test measures, and Warmerly's are currently limited in accuracy.
Who it suits
Pick the one that fits.
Warmerly
Warmerly is the better fit if
- You want a basic test inside the tool that warms the mailbox
- You use a separate placement tool already
- You mainly need warmup and campaigns
Folderly
Folderly is the better fit if
- You want placement tests across Gmail, Outlook and Yahoo
- You want up to 100 tests a month
- You want placement alerts over time
- You want a shareable report to send to a client
- You want monthly volume of 100 tests or more
Questions
Does Folderly test inbox placement?
Yes. Inbox Insights tests where emails land in Gmail, Outlook and Yahoo, with 2 free tests a month or 100 tests a month for $79 (read 21 October 2026). How placement is measured is not stated.
Is Warmerly's placement test accurate?
Not yet in full. With no dedicated seed list it falls back to Warmerly's own mailboxes, so it is labelled Limited accuracy in the app.
How does Warmerly score a placement test?
Each target scores inbox 100, promotions 60, spam 10 and missing 0, and the scores are averaged across up to 4 targets.
What is the yearly price of Inbox Insights?
The test page shows $799 per year with a saving of $149 and a Save 15% label. The pricing page shows $799 without saying the period (read 22 October 2026).
Does Folderly say how many seed inboxes it uses?
No. The pages we read do not state the sample size, the seed count or how accurate the results are.
Sources
Folderly pages were read on 21 October 2026. Plans and wording change, so check the vendor's own page before you decide. Warmerly details come from the product as it runs today.
More features
- All features
- Starting price (per month)
- Pricing model
- Cost at 5, 25 and 100 mailboxes
- Free plan or trial
- Warmup and mailbox engagement
- SPF, DKIM, DMARC and blocklist checks
- DMARC reports
- Alerts
- Content and spam-trigger checks
- Campaign sending
- Mailbox providers and sending services
- Agencies, teams and API
- Security and data hosting
See it on your own mailbox.
Connect a mailbox. Warmerly runs alongside whatever you send from now, so you can compare before you move anything.
Free plan, no card. Paid plans: 7-day trial, first charge on day 8.