GlockApps alternatives
You're here because placement tests used up your credits, or because a good placement result still ended in bounces. ZapBounce gives you a free message test and a check on every address, both on one site, so each campaign goes out tested and clean.
| Service | 100,000 addresses | Credits expire? | Bills unknowns? |
|---|---|---|---|
| ZapBounce | $139 | Never | No |
| ZeroBounce | Subscription only | Credits roll over while the subscription is active | Not stated |
| Bouncer | $400, and 1,000,000 for $2,000 | Never | No |
| Emailable | Custom | Never | No |
| Clearout | Not listed | Never | No |
| Kickbox | $500 ($1,100 for 250,000; $2,999 for a million) | Credits expire one year from purchase | No |
| GlockApps | See their pricing page | See their pricing page | Not stated |
Read from each vendor's own pricing page in September 2026. Prices move, so confirm theirs before you buy. Ours are published in full on the pricing page.
Why people look elsewhere
Credits and plan size are the usual trigger. GlockApps counts spam tests in credits set by the plan tier, so the tier decides how often you can test. The list behind each campaign is a separate job, because a placement test reports where one message landed.
GlockApps sells Free, Essential, Growth and Enterprise plans, billed monthly or at a discount annually, and each tier carries a set number of spam-test credits beside DMARC Analyzer and Uptime Monitor (glockapps.com/pricing, read September 2026). ZapBounce's deliverability test is a free tool, and list checks are priced per address: $25 for 10,000, with credits that never expire.
What ZapBounce changes for a GlockApps user
The differences that show up on the first invoice and the first results file.
The short version
- The ZapBounce deliverability test and email spam checker are free tools: send one email to a one-off address and get a score out of 10 with a fix for each finding.
- Every address on the list gets its own SMTP check on port 25, closed before DATA, so your contacts receive nothing.
- Each row comes back valid, invalid, catch_all or unknown, beside your original columns.
- List checks cost $5 for 1,000 and $25 for 10,000, and unknown results and duplicate rows are never billed.
- Your balance carries over indefinitely, and a monthly allowance of 100 checks lands on your account without a card on file.
Before you move off GlockApps
Run the same sample through two vendors and the interesting number is not how many came back valid.
Count the spam tests you ran last quarter
Your GlockApps credit history shows it. If it's one or two per campaign, a free test before each send fits the same step in your workflow.
Test from the platform that really sends
Your ESP signs and routes mail differently from your inbox. Send the ZapBounce test from the tool your campaign goes out through, so the score matches the real send.
Read your DMARC record before you renew
Look up your published policy on the ZapBounce DMARC checker. You'll see what a monitoring plan would be watching before you pay for the next term.
Clean the list behind the campaign
Upload the list to ZapBounce bulk verification. Rows come back valid, invalid, catch_all or unknown, and unknowns and duplicates are never billed.
What switching actually involves
Move the pre-send checks first. Send your campaign email to the ZapBounce test address from the platform that really sends it, and read the score and findings. Then upload the list as a CSV, TXT or XLSX file and read the verdict on every row. If you rely on GlockApps' DMARC reports, they can keep running while you switch.
What stays true whichever verifier replaces GlockApps
Questions about moving off GlockApps
Is there a free alternative to a GlockApps spam test?
Yes. ZapBounce's email deliverability test and email spam checker are free. You send one email to a one-off address and get SPF, DKIM, DMARC, reverse DNS, blocklist and content findings, with a score out of 10.
What's the difference between an inbox placement test and list verification?
A placement test sends one message and reports where it landed. List verification checks every address before you send, so dead mailboxes stay out of your campaign. ZapBounce returns valid, invalid, catch_all or unknown per row and never bills an unknown.
Can I check my DMARC setup without a paid plan?
Yes. ZapBounce's DMARC checker reads your published record for free, and the DMARC generator builds a record for you to publish. Recheck it after any DNS change.
Why do people leave GlockApps?
Credits and plan size are the usual trigger. GlockApps counts spam tests in credits set by the plan tier, so the tier decides how often you can test. The list behind each campaign is a separate job, because a placement test reports where one message landed.
How hard is it to switch verifiers?
For bulk cleaning, no harder than uploading the file somewhere else. For real-time checks on a signup form it is an API swap, which is an afternoon.
Send your next campaign email through the ZapBounce test, then run the list behind it. You'll have a score out of 10 and a verdict on every address before the send.
Put us next to GlockApps on your own list
100 free checks a month, no card.