Our take
Pick Langtail if you're on a product team who will stay on Free at $0 (2 prompts, 1,000 logs, 30-day retention, unlimited users) while they open a first Playground, then Pro at $99/month + VAT when they need 20 prompts and unlimited logs. Pick PromptLayer if you're on a aI team who will pay Pro or Team so more than 10 playground runs a day and 2.5k requests sit on a shared registry.
Best for
Langtail A spreadsheet-style prompt you ship at a public $
PromptLayer Ship prompts without a redeploy
Free plan
Langtail $0 · /month + VAT. Unlimited users. 2 prompts or assistants. 1,000 logs / month. 30-day retention. Public shareable apps
PromptLayer $0 · /month. 5 users; 2.5k requests / month; 1 workspace; 250 eval cell executions / month; 10 playground runs / day; 10MB max dataset; 750 agent node executions / month. SaaS
Lowest paid
Langtail Pro $99/mo
PromptLayer Pro $49/mo
Coding agent
Langtail
PromptLayer Agents / workflows
Runs where
Langtail Local or hosted
PromptLayer
Watch out
Langtail Free is 2 prompts
PromptLayer Free is 2.5k requests and 10 playground runs a day
Last checked
Langtail 2026-10-27 · langtail.com/pricing
PromptLayer 2026-10-22 · promptlayer.com/pricing
product teams who will stay on Free at $0 (2 prompts, 1,000 logs, 30-day retention, unlimited users) while they open a first Playground, then Pro at $99/month + VAT when they need 20 prompts and unlimited logs.
Read the Langtail pageaI teams who will pay Pro or Team so more than 10 playground runs a day and 2.5k requests sit on a shared registry.
Read the PromptLayer page
