Langtail
Langtail is a hosted prompt playground + test desk: you edit System / User templates, attach tools, and deploy the prompt as an API.
OUR TAKE
Pick Langtail for 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. Free is 2 prompts.
Good fit
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.
Poor fit
Free · Pro $99/mo · Team $499/mo
USD, before tax · Checked 2026-10-27 · langtail.com/pricing
OUR TAKE
Pick Langtail for 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. Free is 2 prompts. Splitting one prompt into three burns the Free cap.
Good fit
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.
Poor fit
Free · Pro $99/mo · Team $499/mo
USD, before tax · Checked 2026-10-27 · langtail.com/pricing
What it costs
USD, before tax · Checked 2026-10-27 · langtail.com/pricing
Free
+ VAT. Unlimited users. 2 prompts or assistants. 1,000 logs / month. 30-day retention. Public shareable apps
$0
Pro
+ VAT. 1 user. 20 prompts or assistants. Unlimited logs. 90-day retention
Lowest paid
$99/mo
Team
+ VAT. 10 users. Unlimited prompts. Unlimited logs. 1-year retention. Radars & Alerts. Dedicated support
$499/mo
Enterprise
Not published by the vendor
Not published by the vendor
Checked 2026-10-27·langtail.com/pricing
Before you pay
Good fit
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.
Watch out
Free is 2 prompts. Splitting one prompt into three burns the Free cap.
Instead, try
PromptLayer if prompt logs when you want PromptLayer’s public $; Promptfoo if YAML eval + red team when you want Community Free Forever
Compare Langtail with
Limits, in full
- 01
Free is 2 prompts. Splitting one prompt into three burns the Free cap.
- 02
Pro is 1 user / 20 prompts. A second editor is Team $499.
- 03
A prompt playground, not PromptLayer’s request log. For that see PromptLayer.
If Langtail isn't it
Why: prompt logs when you want PromptLayer’s public $.
Free· paid from$49/mo
Free is 2.5k requests and 10 playground runs a dayChecked 2026-10-22·promptlayer.com/pricing
vs Langtail
Why: YAML eval + red team when you want Community Free Forever.
Free· open source,MIT
Community red team is 10k probes/monthChecked 2026-10-27·promptfoo.dev/pricing
vs Langtail
Why: prompt + trace when you want Latitude Free $0 / Pro $99.
Free· paid from$99/mo
Free is 20k credits / 30 daysChecked 2026-10-27·latitude.so/pricing
vs LangtailLimits & alternatives3 limits · PromptLayer, Promptfoo, Latitude instead
Limits, in full
- 01
Free is 2 prompts. Splitting one prompt into three burns the Free cap.
- 02
Pro is 1 user / 20 prompts. A second editor is Team $499.
- 03
A prompt playground, not PromptLayer’s request log. For that see PromptLayer.
If Langtail isn't it
Why: prompt logs when you want PromptLayer’s public $.
Free· paid from$49/mo
Free is 2.5k requests and 10 playground runs a dayChecked 2026-10-22·promptlayer.com/pricing
vs LangtailWhy: YAML eval + red team when you want Community Free Forever.
Free· open source,MIT
Community red team is 10k probes/monthChecked 2026-10-27·promptfoo.dev/pricing
vs LangtailWhy: prompt + trace when you want Latitude Free $0 / Pro $99.
Free· paid from$99/mo
Free is 20k credits / 30 daysChecked 2026-10-27·latitude.so/pricing
vs Langtail