Forge — Prompts as source code
Bring your own keys. Pay only the seats.

Treat prompts like source code.

Store, fork, and side-by-side test your prompts across every model — catch regressions before your customers do.

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No model markup · Export everything · SOC 2 in progress
forge / outbound / cold-outreach-short.prompt — v14

Prompt body v14

You are writing to {{persona}} at {{company}}. Open with this observation: {{observation}} Keep it under 90 words. Do not use the word "synergy". End with one specific question.

Evaluation grid 1 regression

Greets by first name case_1 claudePassgpt-4.1Pass
Stays under 90 words case_2 claudePassgpt-4.1Pass
Avoids "synergy" case_3 claudePassgpt-4.1Fail
Ends with one question case_4 claudePassgpt-4.1Pass
claude 5/5 · gpt-4.1 4/5 (regressed) · $0.029 total
HARBORLINE RIVERSIDE NORTHWICK·LABS SAILMARK FIELDSTONE OLINK

Stop pasting the same prompt into three tabs.

Name them, version them, review them — the same way you treat the rest of your work.

Versioned by default

Every save is an immutable snapshot. Diff v12 against today's draft in one click. Revert when last week's was better.

Side-by-side any model

Pick two, three, or four providers. Hit run. See cost, latency, and pass-rate in one grid. Bring your own keys — we never mark up tokens.

Tests travel with the prompt

Attach cases — contains, regex, JSON-schema, model-as-judge, human pick. A regression on next week's model update is a notification, not a customer ticket.

Packs & the marketplace

Group prompts into a pack and share inside your workspace, with a vendor, or to the public catalog. Buyers fork into their own library and keep the upstream link for future updates.

Budgets that hold the line

Set a daily budget per workspace. See a pre-flight token estimate before a 200-case eval kicks off. No five-figure surprises.

Portable, always

Export every prompt to JSON or Markdown. Your prompts are your IP. Walk away anytime with the full version history intact.

"We had 60-something prompts hidden in one engineer's Notion. After two weeks on Forge, four other teams adopted them. Last Tuesday a model update regressed one — we knew before any customer did."
EC Elena Chen · Head of Product Ops, Harborline

Start with one prompt. See where the library takes you.

Free for individuals. Paid seats only when teammates start forking each other's work.

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