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General

Smelt is an AI-powered copy generation platform for creating personalized cold email content at scale. Upload your lead CSV, choose templates, and generate unique personalized copy for every prospect.
Smelt is designed for batch processing. ChatGPT can write one email at a time—you’d copy/paste each lead’s info manually. Smelt reads your entire CSV and generates unique copy for every lead automatically, with quality scoring and export features.
Different stages of the workflow:
  • Clay = Data enrichment (finding information about leads)
  • Smelt = Copy generation (writing personalized messages using your data)
Many users use both: Clay to enrich, then Smelt to write.
GPT-4o-mini by default. This provides excellent quality at low cost. Model selection may expand in future updates.
Any tool that accepts CSV import:
  • Instantly
  • Lemlist
  • Smartlead
  • Apollo sequences
  • Any custom sending infrastructure

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Pricing & Billing

  • Free tier: $0 for 250 rows/month
  • Starter: 29/mo(BYOK)or29/mo (BYOK) or 49/mo (Managed) for 5,000 rows
  • Growth: 79/mo(BYOK)or79/mo (BYOK) or 129/mo (Managed) for 25,000 rows
  • Scale: 199/mo(BYOK)or199/mo (BYOK) or 299/mo (Managed) for 100,000 rows
  • BYOK (Bring Your Own Key): You provide your OpenAI API key and pay OpenAI directly for AI costs. Lower monthly fee.
  • Managed: Smelt handles all AI costs. No API key needed. Simpler billing, slightly higher monthly fee.
Yes! Each test counts as 1 row of usage. Test strategically to conserve your allowance.
No. Usage resets at the start of each billing cycle. Unused rows do not roll over.
Jobs are blocked from starting. You’ll see a clear error message with your usage details and an option to upgrade.
Yes! Your new limit takes effect immediately. You’re prorated for the billing change.

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Technical

CSV only. Maximum 50MB file size, up to 50,000 rows per file.
UTF-8 recommended. Also supports UTF-16, Latin-1, and Windows-1252.
Yes! Create fully custom templates with your own prompts. Use {{Column}} variables to reference your CSV data.
Yes! Inline editing is available in the results view. Quality flags are automatically rechecked after edits.
Automated warnings about potential issues in generated output. Smelt checks for 11 different issues including length problems, forbidden words, AI-speak, placeholders, and more.
Using the output from one template as input to another. For example: Template 1 generates a hook → Template 2 uses that hook to write the email body.
Depends on row count. Smelt processes 5 rows in parallel. Rough estimates:
  • 100 rows: ~1-2 minutes
  • 1,000 rows: ~10-15 minutes
  • 10,000 rows: ~1-2 hours

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Security

Yes. Files are stored in encrypted cloud storage (AWS S3). Your data is isolated—other users cannot see it.
API keys are encrypted with AES-256-GCM encryption. They are never stored in plain text and never visible after saving.
Only you. All data is isolated per account. Smelt staff do not access customer data except for support requests with explicit permission.
Yes. You can delete individual files from the Files page. Deleting a file removes it from cloud storage.
No. Your data is used only to generate your outputs. It is not used to train any AI models.

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Still Have Questions?