
CodePen
CodeSandbox
replit
Pastebin.com
JS Bin
VS Code
GitHub
Test your JavaScript, CSS, HTML or CoffeeScript online with JSFiddle code editor.
PROCAI.world
Ducalis.io
productboard
Aha!
airfocus
AutoRFP.ai
Craft.io
Data-driven prioritization with AI evaluation, scoring frameworks, and team alignment tools.

Which is more popular?
Based on our record, JSFiddle seems to be more popular. It has been mentioned 204 times since March 2021.
Website, pricing, platforms and company facts side by side.
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What each product offers, as listed by its team.

Possible disadvantages
Possible disadvantages
An editorial look at what each product does well and who it suits.

Overall verdict
Why this product is good
Recommended for
Overall verdict
Why this product is good
Recommended for
Walkthroughs and reviews on video.
Dashboard JSFiddle Online JavaScript Editor jQuery, Angular, Backbone, Underscore, Knockout, Y
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How often each product is chosen within a category, 0–100% relative to the other.

As answered by people managing JSFiddle and Protis.tech.
Protis.tech's answer:
Protis is the only prioritisation tool where AI is a first-class participant in your team's decisions — not a chatbot or a summary button, but an active team member.
Three things no competitor offers:
AI Requirement Builder — Describe a rough idea in a chat interface. The AI acts as a senior PM, asks clarifying questions, and generates a complete spec with user stories, acceptance criteria, edge cases, and a quality score (0-100). Every spec is scored for Clarity, Completeness, Testability, and Scope before it enters your backlog.
AI Evaluator — AI joins your evaluation sessions as a scoring member. It scores every issue using your framework (RICE, ICE, WSJF, or custom), explains its reasoning, and produces an alignment report showing where AI and humans diverge — surfacing blind spots your team didn't know existed.
AI Sprint Assistant — Pre-sprint priority briefs, post-reveal divergence analysis, and cross-sprint retrospectives generated automatically.
On top of this, Protis uses a BYOK (Bring Your Own Key) model — teams connect their own OpenAI or Anthropic API keys, so there are no per-use AI fees from Protis. You get full AI capability without usage-based charges.
Protis.tech's answer:
Most prioritisation tools treat AI as an afterthought — a bolt-on summariser or a $20/month add-on. Protis was built AI-native from day one.
vs Ducalis — Ducalis has no AI features. Protis gives you AI scoring, AI specs, and AI sprint planning on top of everything Ducalis does.
vs Productboard — Productboard charges $59/maker/month for the base product, then adds another $20/month for AI features. Protis Pro is $19/member/month with everything included — AI, unlimited boards, all integrations, two-way sync.
vs Airfocus — Airfocus starts at $59/editor with AI only in enterprise plans. Protis includes all AI features in a single Pro tier.
vs Linear — Linear is a project management tool, not a prioritisation platform. Protis integrates with Linear as a tracker but adds structured scoring, collaborative evaluation, and AI decision support on top.
The practical reason to choose Protis: your team will make better prioritisation decisions, and the AI will surface patterns and blind spots that no one on your team has time to see manually.
Protis.tech's answer:
Product managers and product leads at B2B SaaS companies, typically at the seed to Series B stage (5–100 people).
More specifically:
Solo PMs and founders who need to bring structure and rigour to prioritisation without a large team
PM leads and Heads of Product who run evaluation sessions with engineering and design and want AI to participate alongside humans
AI-forward operators — product people actively looking to bring AI tools into their workflow to move faster and reduce bias in decision-making
The common thread: teams who take prioritisation seriously, use structured frameworks (RICE, ICE, WSJF), and want AI that actually contributes to decisions rather than just summarising notes.
Protis.tech's answer:
Protis was built to solve a problem every product team faces: prioritisation decisions made on gut feel, incomplete requirements, and misaligned stakeholder opinions — with no structured way to surface blind spots.
The original vision was a collaborative scoring platform where the whole team evaluates together, using frameworks like RICE and ICE, with real-time Scrum Poker and sprint cycles. That core is still the foundation.
What changed the direction was the emergence of capable AI models. Rather than bolting AI on as a feature, we rebuilt the product around a single idea: AI should participate in product decisions the same way a senior team member would — asking the right questions before writing a spec, scoring issues with reasoning, flagging where the team's assumptions might be wrong.
The BYOK (Bring Your Own Key) model was a deliberate choice. We didn't want to charge per AI resolution or gate AI behind expensive tiers. Teams bring their own OpenAI or Anthropic keys, pay their provider directly, and get full AI capability from day one on the Pro plan.
Protis is built by a small, focused team and deployed at protis.tech.
Protis.tech's answer:
Frontend: React 18, TypeScript, Tailwind CSS, shadcn/ui, Recharts
Backend: Node.js, Express.js, TypeScript
Protis.tech's answer:
Protis launched recently and is in early growth stage — we are not yet disclosing individual customer names.
Early access customers are product teams at seed and Series A SaaS companies
Available at protis.tech with a free tier and Pro plan from $19/member/month
Share your experience with using JSFiddle and Protis.tech. For example, how are they different and which one is better?
External articles and on-site reviews we used to compare the two products.

Test your javascript, CSS, HTML or coffeescript online with jsfiddle code editor. Jsfiddle – code playground.
JSFiddle cannot be used to host code on your server. The code has to be on JSFiddle and is public all the time.
What is missing from JSFiddle is live previews. You have to basically refresh the page by clicking on the play button. And compared to other playgrounds, JSFiddle is probably the slowest. Another slightly frustrating...
We have no reviews of Protis.tech yet. Be the first one to post
Recommendations tracked on public social media and blogs since March 2021.

Https://jsfiddle.net/ used to be also very popular, I see that it is still available, but haven't used it in a while. Which other alternatives do people use now days? - Source: Hacker News / 3 months ago
Coding is like learning a new language—you must practice by writing code, not just reading about it. Use free online editors like CodePen, JSFiddle, or Replit to experiment. - Source: dev.to / over 1 year ago
As you embark on these projects, take your time to familiarize yourself with HTML tags and CSS properties. Use online tools like CodePen or JSFiddle to experiment with your code and visualize your results. - Source: dev.to / over 1 year ago
Tracking Protis.tech since Apr 2026.
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