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The Stack / Coding
Promptmetheus
02 DecisionsYes if prompts are load-bearing in your product or automations — an IDE that tests prompt variants across models beats pasting into chat windows and trusting memory. Casual prompting doesn't need this seat; production prompting does.
The job in the stack
The prompt-engineering seat: building prompts from testable blocks, comparing outputs across models, and versioning what works.
Pricing
| Plan | Price | Notes |
|---|---|---|
| Playground | $0 | 1 user, local storage, OpenAI models only |
| Single | $29/mo | 1 user, cloud sync, 15 providers / 150+ models, automatic evaluators |
| Team | $99/mo | 3 users included, $19/mo per additional user; shared workspace, real-time collaboration |
Pricing verified 2026-10-08. Plans change — the source of truth is Promptmetheus's own pricing page.
Models & versions
- Prompt IDE Block-based composition, batch testing, output rating, cost estimation
The honest read
What works
- + Block-based prompts make variants testable, not vibes
- + Cross-model comparison shows where cheaper models suffice
- + History and ratings turn prompt work into an asset, not folklore
What breaks
- − Niche tool — casual users won't feel the payoff
- − You bring your own API keys; costs live on top
- − Team knowledge only compounds if the team actually adopts the library
Use it for
- →Builders shipping LLM features whose prompts must be reliable
- →Automation operators tuning prompts inside n8n/agent workflows
- →Cost optimization: finding the cheapest model that passes your tests
Skip it if
- ×Your prompting is conversational, not production — chat is fine
- ×You already run evals in code — this duplicates your harness
Questions operators ask
?Who actually needs a prompt IDE?
Anyone whose prompt failing costs money — product features, agent workflows, client deliverables. If a bad output just means rephrasing in chat, you don't need this seat yet.
What changed
- Freshness sweep: no change. promptmetheus.com still shows Playground free (OpenAI models only), Single $29/mo (7-day trial, 15 providers, 150+ models), Team $99/mo for 3 users plus $19/mo per extra seat, Enterprise on request. Bring-your-own API keys.
- Freshness sweep: no changes. promptmetheus.com shows Playground free (1 user, local storage, OpenAI models only), Single $29/mo (7-day trial, cloud sync, 15 providers, 150+ models), Team $99/mo (3 users, $19/mo per extra user), Enterprise on request. Still bring-your-own API keys. /pricing returns 404 — the tiers live on the homepage.
- Freshness sweep: tiers confirmed unchanged direct from promptmetheus.com — Playground free (OpenAI models only), Single $29/mo (15 providers, 150+ models), Team $99/mo for 3 users ($19/mo per extra seat), Enterprise custom. Ignored a stale G2 listing showing PRO $99/Team $690 — doesn't match the live site.
- Freshness sweep: tiers confirmed unchanged — Playground free (OpenAI models only), Single $29/mo (15 providers, 150+ models, 7-day trial), Team $99/mo for 3 users. No new plans, no repricing.
- Freshness sweep: renamed seeded tiers to match reality — free tier is "Playground" (not "Free/Playground"), $29/mo tier is "Single" (not "Pro"), Team is a flat $99/mo for 3 users plus $19/mo per additional seat (not a flat ~$49+/user rate).
- Added to the stack (prompt-engineering seat). Pricing seeded from January 2026 baseline, pending fresh verification by the update loop.
Give Promptmetheus a job
The prompt-engineering seat: building prompts from testable blocks, comparing outputs across models, and versioning what works.
Try Promptmetheus →Affiliate link — same price for you, keeps the stack maintained.
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