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Best free developer tools

5 developer tools with a plan that stays free. For each tool you see what is included and when you have to start paying.

We sometimes earn from a click. That does not change the order. How we make money

  1. 1

    Zernio

    Developer tools · for freelancers and SMEs and large companies

    One API to post, schedule and analyse on Instagram, TikTok, LinkedIn, YouTube and other social channels.

      PriceFree
      Visit Zernio

      On the Zernio website

      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.

    • 2

      Firecrawl

      Developer tools · for freelancers and SMEs and large companies

      Open-source API that scrapes, crawls and searches websites and gives your AI agent the content as Markdown or JSON.

        PriceFree
        Visit Firecrawl

        On 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.

      • 3

        Knock

        Developer tools · for freelancers and SMEs and large companies

        Notification infrastructure to send email, SMS, push, Slack and in-app messages from your own app through one API.

          PriceFree
          Visit Knock

          On 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.

        1. 4

          Context.dev

          Developer tools · for freelancers and SMEs and large companies

          Web API for AI agents that scrapes, crawls, searches and fetches brand and company data through one API.

            PriceFree
            Visit Context.dev

            On 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.

          • 5

            CodeRabbit

            Developer tools · for freelancers and SMEs and large companies

            AI code review that checks every pull request in GitHub or GitLab, free for public repositories.

              PriceFree14-day free trial
              Visit CodeRabbit

              On 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.

            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?

            Zernio, Firecrawl, Knock, Context.dev and CodeRabbit 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?

            Zernio comes top in our overall score. In the Netherlands check it scores 1 of 3 points. Do check what the free plan includes: you often miss features you need later.