Open-source vector database from Amsterdam for search and RAG in your own AI app, also as a managed cloud.
- EU data
- Made in NL
PriceFree
Visit Weaviate
On the Weaviate website
Best free developer tools
10 developer tools with a plan that stays free. For each tool you see what is included and when you have to start paying.
Free developer tools tools
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Free and paid: Prices in dollars: Flex from $45 per month (minimum), then usage-based per vector dimension, storage and backup, with no contract. Free: a managed database with 100,000 objects and 1 collection, no credit card. Premium on contract through sales. You can host the open-source version yourself for free. No VAT mentioned.
Monitoring for developers in one package, with error tracking, performance, logs, uptime and host metrics.
- EU data
- European
- Made in NL
From€18.25 /month excl. VATAlso a free plan30-day free trialVisit AppSignalOn the AppSignal website
Free and paid: Paid plan, €219 per year (€18.25 per month), for 250,000 requests per month and 1 GB of logging. The pricing page also offers monthly billing, but does not state that amount in the text. The free plan gives 30,000 requests, 1 GB of logging and 5 days of retention. Above your limit monitoring keeps running and, according to AppSignal, you are not charged for the overage. Long-term log storage and HIPAA cost €89 per month each. Prices exclude VAT according to the terms.
Server management for web developers, with installation, deployments, SSL and monitoring on your own VPS.
- European
- Made in NL
From€8 /monthAlso a free plan5-day free trialVisit PloiOn the Ploi website
Free and paid: Basic, €8 per month billed monthly (€86.40 per year billed annually, 10% off). Pro costs €13 and Unlimited €30 per month. The free plan gives 1 server, 1 site and 5 deployments per month. You pay for the server itself separately to your hosting provider. 5-day trial on Pro, no credit card. Not stated whether prices exclude VAT.
Headless CMS from Utrecht for websites and apps, with A/B tests and personalisation, hosted in the Netherlands.
- EU data
- Made in NL
From€299 /month excl. VATAlso a free planVisit PreprOn the Prepr website
Free and paid: Flex, €299 per month, with 50,000 content items, 150 GB of storage, 500 GB of bandwidth and A/B tests; up to 10% off when billed annually. Community is free for freelancers and developers, with 200 content items, 5 GB of storage and 100 GB of bandwidth. Enterprise on request. Extras such as premium support (€300) and advanced search (€100) cost extra per month. Prices exclude VAT according to the terms.
One API to post, schedule and analyse on Instagram, TikTok, LinkedIn, YouTube and other social channels.
- European
PriceFreeVisit ZernioOn the Zernio website · partner link
Free and paid: Prices in dollars, per connected social media account per month: 1 to 2 accounts free, 3 to 10 $6, 11 to 100 $3, from 101 $1. Example: 10 accounts cost $48 per month. Free without a credit card. The pricing page says nothing about VAT.
Open-source API that scrapes, crawls and searches websites and gives your AI agent the content as Markdown or JSON.
PriceFreeVisit FirecrawlOn the Firecrawl website · partner link
Free and paid: Prices in dollars: Hobby $19 per month ($16 billed annually) for 5,000 credits, Standard $99 ($83) for 100,000 credits. Free: 1,000 credits per month, no credit card. According to the FAQ, Firecrawl charges local VAT automatically based on your location.
Notification infrastructure to send email, SMS, push, Slack and in-app messages from your own app through one API.
PriceFreeVisit KnockOn the Knock website
Free and paid: Prices in dollars: Starter $250 per month for 50,000 messages, then $0.005 per message. Free: up to 10,000 messages per month, without a credit card. You pay the costs of your email or SMS provider (such as Postmark or Twilio) there separately.
Web API for AI agents that scrapes, crawls, searches and fetches brand and company data through one API.
PriceFreeVisit Context.devOn the Context.dev website · partner link
Free and paid: Prices in dollars: Developer $20 per month for 10,000 credits, Pro from $90 for 100,000 credits. Free: 1,000 credits per month, no credit card. Pay annually and you get 2 months free. The pricing page says nothing about VAT.
AI code review that checks every pull request in GitHub or GitLab, free for public repositories.
PriceFree14-day free trialVisit CodeRabbitOn the CodeRabbit website
Free and paid: Prices in dollars, per user per month: Essentials $30 ($24 when paid annually), Team $60 ($48), Advanced $90 ($72). Free reviews for public repositories; you can try the paid plans for 14 days.
REST APIs on Dutch open data, such as KvK company data, BAG addresses and vehicle registrations, with autocomplete.
- Dutch interface
- Made in NL
From€15 /month excl. VATAlso a free planVisit overheid.ioOn the overheid.io website
Free and paid: Small, €15 per month excl. VAT (€150 per year) for 2,500 API calls, 1,000 suggestions and 1,000 geo lookups. Medium €40 (25,000 calls), Large €130 (100,000 calls, with data export). Free: unlimited access to a test dataset of 10,000 random records, refreshed monthly. You cancel immediately by deleting your account.
Free here means: with no end date. A free trial of 14 or 30 days does not count. The order follows our overall score; what a tool pays does not count towards it.
Questions about free software
Which developer tools are free?
Weaviate, AppSignal, Ploi, Prepr, Zernio, Firecrawl, Knock, Context.dev, CodeRabbit and overheid.io have a free plan with no end date. With all other developer tools in our guide you pay, sometimes after a free trial.
Which free developer tools is the best?
Weaviate comes top in our overall score. In the Netherlands check it scores 3 of 3 points. Do check what the free plan includes: you often miss features you need later.