Headless CMS for developer

Also for developer's client!
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Scenarios
I have already have a frontend, I just need a simple CMS for my client.
I'm a frontend developer, I need a free CMS to manage my content.
I don't want to install and maintain a CMS on my own server.
Features
No need to install and maintain a CMS on your own server.
JSON & webhook API output.
Post & forget - free forever, never expired.
Pricing
Free Forever
1GB storage
1k hits per month (API)
JSON API output
Webhook output
Unlimited posts*
Unlimited users
Unlimited properties
* bound to the 1GB storage
USD 19/month
10GB storage
100k hits per month (API)
S3 & RSS output
JSON API output
Webhook output
Unlimited posts*
Unlimited users
Unlimited properties
* bound to the 10GB storage
USD 29/month
20GB storage
500k hits per month (API)
Simple frontend website
Custom domain
S3 & RSS output
JSON API output
Webhook output
Unlimited posts*
Unlimited users
Unlimited properties
* bound to the 10GB storage
FAQ
Do you have a frontend?
Basically, we don't have a frontend. You can use your own frontend which you can build using NextJS or Svelte on Vercel.
How to use the API ?
You can use the API to get the content of your posts. You can also use the API to create, update, and delete the content of your posts.
Where to get the API ?
You can get the API from the CMS UI directly.