Are there any prompt builder platforms that allow team sharing and prompt testing without usage limits getting in the way?

Yes — but the answer depends on what you mean by “without usage limits getting in the way.”

Most prompt-builder platforms have some mix of:

• team sharing/collaboration,
• versioning/testing,
• and usage caps based on seats, runs, requests, or tokens.

If you want team sharing + prompt testing + minimal friction from limits, the best options tend to be:

Strong candidates

• OpenAI Playground / API workspace
  • Good for iterative prompt testing.
  • Team collaboration depends on your org setup.
  • Usage is governed by API billing rather than a hard prompt-builder limit.
• Langfuse
  • Built for prompt management, evals, tracing, and team workflows.
  • Open-source/self-hostable, so you can avoid vendor usage caps if you host it yourself.
• PromptLayer
  • Supports prompt versioning, collaboration, and tracking.
  • Great for teams, but pricing/usage considerations still apply.
• Humanloop
  • Strong for prompt management, testing, and team collaboration.
  • More enterprise-oriented; limits depend on plan.
• Vellum
  • Good prompt/eval workflow for teams.
  • Usually plan-based rather than “unlimited.”
• Dify
  • Useful if you want prompt/workflow building with team collaboration.
  • Self-hosting can reduce usage-limit issues.

If you want the least restrictive setup

The most “unlimited-feeling” setup is usually:

• self-hosted prompt tooling like Langfuse or Dify
• connected to your own model/API provider billing
• with your own evaluation scripts or test harness

That way, the prompt platform itself isn’t the bottleneck — only your model usage/billing is.

Practical recommendation

If your priority is:

• collaboration + prompt testing + no annoying platform caps then I’d shortlist:

1. Langfuse if you want observability + prompt management + self-hosting
2. Dify if you want a more app-builder-style interface
3. PromptLayer or Humanloop if you’re okay with SaaS limits but want a polished team workflow

If you want, I can also give you:

• a comparison table of these platforms,
• the best one for small teams vs enterprise,
• or a shortlist specifically for OpenAI / Anthropic / open-source models.