Dev tools · alternatives · 2026

24 alternatives to FormSanitizer

Stop spammy form submissions with custom filters.

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes.

1
FormKeep▲117
Form endpoints for designers and developers
2014 · formkeep.com · its alternatives →
2
FormStory io▲446
Recover every lead, even when tech fails
2024 · formstory.io · its alternatives →
3
Reform▲767
Clean-looking, on-brand forms. No code required.
2021 · reform.app · its alternatives →
4
Mailwarm 2.0▲676
The email warmup tool, upgraded for deliverability.
Jun 2026 · mailwarm.com · its alternatives →
5
Bot Butcher▲106
API for classifying contact form spam
2023 · botbutcher.com · its alternatives →
6
You've Got Spam▲305
A new tool that lets you spam back the spammer
2020 · youvegotspam.mschfmag.com · its alternatives →
7
Warmbox▲383
Warm-up your inbox and never land in spam
2021 · warmbox.ai · its alternatives →
8
SubscriptionZero▲139
Declutter your Inbox by combining your newsletters emails
2019 · subscriptionzero.com · its alternatives →
9
FormKeep – Form endpoints for designers and developers▲28
No iframes, JavaScript embeds, or CSS overrides. Save data from online forms without a server. Filter submissions for spam. Forward them with webhooks. Great with WordPress, Jekyll, Middleman, Hugo, Gatsby, GitHub Pages or other static sites.
2014 · formkeep.com · its alternatives →
10
Formester▲85
We have built this form/survey builder with the aim to keep it fast, intuitive and simple. It would be awesome if we can get some feedback on what you feel about the tool. And what more would you like to see in the tool.
2022 · formester.com · its alternatives →
11
Warmup Inbox▲204
Free email spam checker & inbox placement tester
2023 · warmupinbox.com · its alternatives →
12
Gapflow.io▲141
Spam filter, autoreply & forwarding for Webflow native Forms
2025 · gapflow.io · its alternatives →
13
FormSubmit▲168
Receive your site's form submission directly to your inbox
2019 · formsubmit.co · its alternatives →
14
Form Defender▲8
Defend your forms from spam
Dec 2025 · formdefender.me · its alternatives →
15
FormBlob▲71
Build stunning forms fast with no code
2021 · its alternatives →
16
Make senders work to get into your inbox▲44
Hi HN :) really excited to share this with you. The one thing AI reliably does is generate noise. Half the tools I see launch are just machines for producing more noise across more channels. And people are starting to see this in the form of emails in their inboxes as spam filters are struggling. There used to be a useful signal in email: the effort a sender put into customizing a message was a rough proxy for how relevant it actually was. AI killed that. Now it's customized slop with the appearance of effort with none of the cost. It is painful that the open internet / open channels…
Jul 2026 · captchainbox.com · its alternatives →
17
Form Builder by Webiny▲131
Visual form builder. OpenSource, serverless and dev-friendly
2019 · webiny.com · its alternatives →
18
SaveForm.io▲78
Automated form tracking and e-mail notifications & webhooks
Apr 2026 · saveform.io · its alternatives →
19
Spam Checker by Mailmeteor▲88
Detect and remove spam words in your emails
2022 · mailmeteor.com · its alternatives →
20
FormDesigner▲58
Online web form builder of any complexity
2021 · formdesigner.pro · its alternatives →
21
RoboKiller▲85
The app that stops spam calls forever
2019 · robokiller.com · its alternatives →
22FJ
Formbuilder.js▲78
2013 · dobtco.github.io · its alternatives →
23
CapSumo▲70
Generate leads by seeing who visits your abandoned web forms
2020 · capsumo.com · its alternatives →
24
FormMaster.io▲24
Create forms in seconds. Smart, simple & AI-powered
2025 · its alternatives →

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Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →