To-do lists built from goals, calendars and routines rather than typed by hand.
How to get a free Productivity & writing API key
Four steps from a blank editor to a working call, across the 10 Productivity & writing APIs in this catalogue — all on a plan that costs nothing.
The steps
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Compare the options
This catalogue has 10 Productivity & writing APIs with a free plan. Sort them by endpoint count, latency or subscribers and shortlist two or three that cover what you need.
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Open the listing and subscribe to the free plan
Every listing links straight to the marketplace page. AI daily task planner — smart to-do generator & schedule API is the most subscribed one in this category, which makes it a safe first stop. The Basic plan costs $0 and asks for no card.
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Copy your API key
The key appears the moment the subscription is created. It goes in a request header — never in front-end code or a public repository.
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Make the first call and check the quota
The marketplace playground runs a real request in the browser before you write any code. Once it answers, watch the monthly quota: the free tier is generous but not unlimited, and every Productivity & writing listing publishes its own limit.
Which Productivity & writing API to start with
Ready-to-send replies for Gmail, Outlook, Yahoo and Office 365.
Personalised, professional email drafts from a short brief.
Job descriptions written with the industry keywords that make them findable.
Scheduling, task automation and habit coaching from one productivity endpoint.
Estimate what a project will cost and how long it will take.
Productivity & writing APIs → Best free Productivity & writing APIs →
Frequently asked questions
- How many free Productivity & writing APIs are listed here?
- This catalogue lists 10 Productivity & writing APIs, all with a plan that costs $0. The most used are AI daily task planner — smart to-do generator & schedule API, AI email response generator — smart auto reply, AI email writer — professional emails in seconds.
- Which free Productivity & writing API covers the most endpoints?
- AI email response generator — smart auto reply covers the most ground with 7 endpoints.
- What does the cheapest paid Productivity & writing plan cost?
- Past the free plan, AI daily task planner — smart to-do generator & schedule API is the cheapest at $9.99 a month.
- Are these Productivity & writing APIs really free?
- Yes. Every Productivity & writing API listed here has a plan that costs $0 a month and needs no card. Paid plans exist for higher volume and their prices are in the table above.