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Software · head to head

PromptLayer vs Zeplin

PromptLayer logo

PromptLayer

Software

Collaboration platform for prompt management, evaluation, and observability

From
Free
Rated
-
Full reviewWebsite
Zeplin logo

Zeplin

Software

Design handoff and developer collaboration

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: PromptLayer the free plan is capped at only 2,500 requests per month, quite limited for active production use.; Zeplin the free plan is limited to 1 project and 100 screens and works only in a personal workspace
  • They diverge on capability: PromptLayer covers Visual prompt management, Zeplin covers Design specs.

Where they differ

Only the attributes on which PromptLayer and Zeplin actually diverge.

Attributes where PromptLayer and Zeplin differ
AttributePromptLayerZeplin
Pricing modelfreemiumsubscription
Platformsweb, apiWeb, Desktop, Mobile
FoundedUnknown2014

Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated), category (Unknown).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in PromptLayer

  • Visual prompt management
  • Agent observability
  • Evaluations
  • Cost and latency monitoring
  • Agent workflow tracing

Only in Zeplin

  • Design specs
  • Asset export
  • Code snippets
  • Design tokens
  • Comments
  • Handoff workflow
  • Accessibility checks
  • Figma

Both cover

  • Version control

What people use each for

The jobs each tool is most often brought in to do.

PromptLayer

  • Versioning and deploying prompts without code redeploysnot Zeplin
  • Running evaluations with human review before production releasenot Zeplin
  • Tracing multi-step agent workflows for debuggingnot Zeplin
  • Monitoring LLM cost and latency by featurenot Zeplin

Zeplin

  • Handing off design specs from Figma or Sketch to developersnot PromptLayer
  • Sharing screens, assets and style guides with an engineering teamnot PromptLayer
  • Reviewing and commenting on design versionsnot PromptLayer

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

PromptLayer

  • The free plan is capped at only 2,500 requests per month, quite limited for active production use.
  • The Team plan jumps to $500/month, a large step up from the $49/month Pro plan.
  • Overage transaction fees apply on top of subscription costs, which can make total spend less predictable.
  • Enterprise-grade features like HIPAA BAAs and custom deployment require contacting sales.

Zeplin

  • The free plan is limited to 1 project and 100 screens and works only in a personal workspace
  • Free plan AI reviews are capped at 3 per week
  • Role based permissions require the Advanced plan or higher
  • Single sign on, multi factor authentication, activity logs and invoiced billing are Enterprise only
  • Priority 24 hour support is Enterprise only
  • Basic plan caps screens at 1,000 per project and is priced per project rather than per seat
  • Enterprise pricing is by quote with no published rate

Pricing, plan by plan

PromptLayer

Free
  • FreeFree
    • 5 users
    • 2,500 requests/month
    • 1 workspace
  • Pro$49/month
    • Unlimited playgrounds and workspaces
    • 150MB datasets
    • Pay-as-you-go overage at $0.003/transaction
  • Team$500/month
    • 25 users
    • 100k+ monthly requests
    • Webhooks
  • Enterprise$undefined/mo
    • Custom limits
    • Role-based access controls
    • HIPAA with BAA

Zeplin

Free
  • FreeFree
    • 1 project
    • 1 workspace
    • Basic specs
  • Starter$19/month
    • Unlimited projects
    • Multiple workspaces
    • Advanced specs
  • Professional$49/month
    • Everything in Starter
    • Team collaboration
    • Admin controls

Which should you pick?

Choose PromptLayer if

  • You need visual prompt management.
  • You want to start without paying.
  • You work on web, api.
  • You also want agent observability.
PromptLayer review

Choose Zeplin if

  • You need design specs.
  • You want to start without paying.
  • You work on Web, Desktop, Mobile.
  • You also want asset export.
Zeplin review

Questions people ask

Is PromptLayer or Zeplin better?
Neither clearly leads. PromptLayer starts at Free and Zeplin at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, PromptLayer or Zeplin?
PromptLayer starts at Free and Zeplin at Free.
Does PromptLayer or Zeplin run on more platforms?
PromptLayer runs on web, api. Zeplin runs on Web, Desktop, Mobile.
Can I use PromptLayer for free?
Both have a free tier, so you can try either at no cost before committing.
What is PromptLayer best used for?
PromptLayer is most often used for versioning and deploying prompts without code redeploys, running evaluations with human review before production release, tracing multi-step agent workflows for debugging, monitoring llm cost and latency by feature. Of those, versioning and deploying prompts without code redeploys and running evaluations with human review before production release are not what Zeplin is typically brought in for.
What can PromptLayer do that Zeplin cannot?
PromptLayer covers Visual prompt management, Agent observability, Evaluations, Cost and latency monitoring. Zeplin covers Design specs, Asset export, Code snippets, Design tokens. Both handle Version control.

Answered from the vendors’ own pages

PromptLayer: What does PromptLayer cost?

PromptLayer has a free plan, a Pro plan at $49/month, a Team plan at $500/month, and custom Enterprise pricing, with additional usage billed per transaction beyond plan limits.

Source
PromptLayer: Is there a free plan, and what are its limits?

The Free plan includes 5 users, 2,500 requests per month, 1 workspace, 250 monthly eval cell executions, and datasets up to 10MB.

Source
PromptLayer: How is usage metered beyond the plan limits?

Additional usage is charged per transaction for requests, agent runs, and evaluation cell runs, at $0.003/transaction on Pro and $0.002/transaction on Team.

Source
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