Notes from building ApyHub.
Engineering write-ups, product decisions, and the occasional opinion on how to ship developer infrastructure. Long enough to be useful, short enough that you'll finish it.
Best Content Moderation APIs in 2026: Image, Video and Text Compared
Compare 7 content moderation APIs for images, video and text: OpenAI, Google, AWS, Azure, Hive, Sightengine and ApyHub. Free tiers, pricing and EU options.
OpenAI Decisions API Explained: How It Works and When Not to Use It
What the OpenAI Decisions API does, how it works, what it costs, and which decisions should be a simple rule or validation check instead.
PDF to Markdown with Python: A Resumable OCR Pipeline for RAG
Convert PDF to Markdown page by page with an OCR API, keep page numbers for citations and resume failed jobs. Python script for RAG ingestion.
Business Day Calculator in Python: Add Working Days with Holidays and Closures
Add business days that skip weekends, public holidays and company closures. Python tutorial with a working script, real response and boundary rules.
Invoice Generator API: Create Invoice PDFs from JSON with Python
Use an invoice generator API to turn billing records into PDF, Word or HTML invoices from JSON. Python tutorial with a working script and storage tips.
Text to Speech in Python: 5 Ways (Offline, Free and API)
Convert text to speech in Python with pyttsx3, Piper (offline), gTTS, edge-tts or a text to speech API. Short code examples and when to use which.
How to Save a Webpage as a PDF (Chrome, Safari, iPhone, Android and API)
Save any webpage as a PDF in Chrome, Edge, Firefox, Safari, iPhone and Android, fix pages that get cut off, and convert URLs to PDF automatically with an API.
REST vs GraphQL vs gRPC vs SOAP: API Protocols Explained
The main types of API protocols compared: REST, GraphQL, gRPC, SOAP, WebSockets, webhooks and MCP. What each one is, when to use it, with examples.
400 Bad Request Error: Causes and How to Fix It
What a 400 Bad Request error means, why it happens and how to fix it, in the browser and in your API. Includes the cookie too large fix and a debugging checklist.
Best Geocoding APIs in 2026: Free Tiers, Pricing and Limits Compared
Compare 8 geocoding APIs: Google, Mapbox, HERE, Geoapify, LocationIQ, OpenCage, Nominatim and ApyHub. Free tiers, price per 1,000, limits, EU options.
OpenClaw skills and AI agent security: why a malware scan isn't trust
341 malicious skills on ClawHub showed how agents inherit supply chain risk. What a scan catches, what it misses, and what your agent should check first.
What Is an MCP Connector? How to Add One to Claude, ChatGPT and Le Chat
What an MCP connector is, and how to add one to Claude, ChatGPT and Le Chat step by step. Includes the URLs, where to find trusted connectors, and prompts to try.