Top 8 Open-Source Alternatives to Prompt API

Prompt API

Prompt API is a curated API marketplace with high scalability and security for developers.

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Product categories

API API Clients API Marketplace API Observability API Testing API Tools APIs Analytics Analytics Dashboard Developer APIs Developer Tools Realtime Backend / API

Summary

The top open-source alternatives to Prompt API are ApyHub, APILayer, and Leaf PHP. One of the criteria for ordering this list is the number of mentions that products have on reliable external sources. You can suggest additional sources through the form here.

ApyHub Landing Page
1

ApyHub

As the software developer's utility belt, ApyHub offers a collection of powerful utility APIs, making it easier for developers to access data & functionality, save time and boost efficiency.
Pricing:
- Open Source
- Freemium
- Free Trial
#API Tools #Developer Tools #APIs 15 social mentions
APILayer Landing Page
2

APILayer

API marketplace and ready to run app backends for your mobile app and website.
Pricing:
- Open Source
- Freemium
- Free Trial
#API Tools #Developer Tools #API Marketplace 5 social mentions
Leaf PHP Landing Page
3

Leaf PHP

Create clean, simple but powerful web apps and APIs quickly.
Pricing:
- Open Source
#Productivity #Web Frameworks #Developer Tools 5 social mentions
Postman Landing Page
4

Postman

The Collaboration Platform for API Development
Pricing:
- Open Source
#API Tools #Developer Tools #APIs 30 social mentions
Moesif Landing Page
5

Moesif

Grow and Monetize API Products
Pricing:
- Open Source
- Freemium
- Free Trial
#API Tools #Recurring Billing #Web Analytics 1 social mentions
OneSignal Landing Page
6

OneSignal

Customer engagement platform used by over 1 million developers and marketers; the fastest and most reliable way to send mobile and web push notifications, in-app messages, emails, and SMS.
Pricing:
- Open Source
- Freemium
- Free Trial
- $9.0 / Monthly (Plus usage-based costs. (Growth Plan). )
#Email Marketing #API Tools #Realtime Backend / API 26 social mentions
Treblle Landing Page
7

Treblle

End to End APIOps Platform
Pricing:
- Open Source
- Freemium
- Free Trial
- $25.0 / Monthly (For 1 Workspace, 1 API, 250,000 Requests / mo)
#API Tools #Error Tracking #Realtime Backend / API 27 social mentions
Insomnia REST Landing Page
8

Insomnia REST

Design, debug, test, and mock APIs locally, on Git, or cloud. Build better APIs collaboratively for the most popular protocols with a dev‑friendly UI, built-in automation, and an extensible plugin ecosystem.
Pricing:
- Open Source
#API #API Tools #Developer Tools 129 social mentions