Productivity · Lifetime deal
CustomJS
API tools for headless forms, JavaScript with NPM, and HTML to PDF in one place.
CustomJS at a glance
- Platform
- Web, API
- Upgrades
- Upgrades are allowed while the deal is live. Downgrades are only allowed within 60 days of purchase. If a plan name changes, your license moves to the new plan.
- Support
- Responses are expected within 24 hours. API docs are linked.
Our take
Is CustomJS worth buying?
Based on the AppSumo listing, CustomJS is a three-in-one API toolkit with clear tier limits, but the page shows the deal sold out. The stored tier matches License Tier 1 with 100 requests a day. Check availability and caps against your automation volume.
Good fit if
- You run workflows in Make or n8n and need a small script or PDF step.
- You want form endpoints without hosting a backend.
- You generate PDFs or screenshots by API.
Skip it if
- Your volume exceeds the daily request caps.
- You need the deal to be available now.
Which CustomJS plan do you need?
Prices in USD, excluding tax.
| Lifetime deal | |
|---|---|
| Requests per day | 100 |
| Forms | 9 |
| Form responses per month | 2,000 |
| Mail hooks | 3 |
| Incoming emails per day | 50 |
| Hosted pages | 10 |
| Custom domains | 1 |
Before you buy: AppSumo's terms and extra costs
- Refund. AppSumo lists refunds for up to 60 days. Plus members also have the We Got Your Back guarantee.
- Redeem. Activate your license within 60 days of purchase.
- Upgrades. Upgrades are allowed while the deal is live. Downgrades are only allowed within 60 days of purchase. If a plan name changes, your license moves to the new plan.
- AI usage cost. Future AI models may cost extra or come at a discount, per the listing.
- Support. Responses are expected within 24 hours. API docs are linked.
What is CustomJS?
CustomJS bundles three API-first tools: headless forms, a JavaScript runtime with NPM support, and an HTML to PDF and screenshot renderer. Form submissions can go to Make, n8n, Airtable, Notion or any HTTP API, and incoming email can be forwarded to webhooks. Plans scale daily requests, forms and responses. The AppSumo deal is marked sold out.
What CustomJS says it does
- Headless forms routed to Make, n8n, Airtable, Notion or any HTTP API
- JavaScript execution with NPM support returning text, JSON, PNG or PDF
- HTML to PDF with Google Fonts and pagination controls
- Built-in MCP server so AI agents can call CustomJS
Why CustomJS
Small automation builds often need a form endpoint, a script and a PDF renderer, each hosted separately. CustomJS puts them behind one API. Plans have daily request and monthly response caps, so heavy volume needs a higher tier.
How does CustomJS work?
Activate the license
Activate within 60 days of purchase.
Build a form or script
Use the drag-and-drop form builder or write JavaScript.
Connect your workflow
Send results to Make, n8n, Zapier or any HTTP endpoint.
Generate documents
Render HTML to PDF or take page screenshots by API.
Then it handles:
- Headless form endpoints
- Forwarding incoming email to webhooks
- Running JavaScript with NPM packages
- Converting HTML to PDF
- Screenshots of web pages
- Hosting HTML pages on a custom domain
- Calling tools from AI agents over MCP
Who is CustomJS for?
Built for
- Automation builders on Make or n8n who need a small script step
- Small agencies that generate PDFs for clients
- Solo builders who do not want to host Lambda functions
Not for
- High-volume users above the daily request caps
- Buyers who need the deal today, since AppSumo shows it sold out
- Teams that want a no-code tool without any API use
What is included in CustomJS?
Forms and email
- Headless forms drag-and-drop builder
- Email notifications template variables
- Mail hooks forward incoming email to webhooks
Code and documents
- JavaScript with NPM support
- HTML to PDF Google Fonts and pagination
- Page screenshots with browser automation
Hosting and integrations
- Hosted HTML pages custom domain
- Make, n8n, Zapier, HTTP
- MCP server
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Add to your workspaceCustomJS questions
What is CustomJS?
A set of API tools: headless forms, a JavaScript runtime with NPM support, and an HTML to PDF and screenshot renderer.
Is the deal available?
The AppSumo page marks it sold out, with a notify option if it returns.
What are the Tier 1 limits?
100 requests per day, 9 forms, 2,000 form responses per month, 3 mail hooks, 50 incoming emails per day, 10 hosted pages and 1 custom domain.
How do the higher tiers differ?
Tier 2 lists 200 requests per day and 29 forms. Tier 3 lists 500 requests per day and 59 forms. Both are priced separately.
What is the refund policy?
AppSumo lists refunds for up to 60 days. You must activate the license within 60 days.
Which tools does it connect to?
Make, n8n and direct HTTP calls. The page also lists Google Drive, HubSpot, Pipedrive and Zapier.
Often compared with
These are other tools in the same space, not deals on GrabLTD.
- Zapier Code
- Pipedream
- Typeform
- Tally
- DocRaptor
Sources
Checked . Prices and terms on this page come from:
