Public price
Found a public price ($49 per month) on the pricing page.
Open sourcePromptLayer alternatives
PromptLayer costs $49 per month. We found 7 out of 10 of the buying evidence we check for. 5 of the 22 other products below publish more.
This is a comparison of what each company publishes on its own site. It covers price, free access, measured results, documented limits, product updates, and testing methods. It is evidence for a shortlist, not a rating of product quality. The products below share a broad category and are not necessarily direct substitutes. Use Comparima for direct competitors.
LLM observability and evalsHow this market looks from public information.
6 of 23for published buying evidence
3 of 7comparable monthly prices are lower
78%can be tried first
30%publish measured results
65%state their limits
What we could verify
Every finding links to the page it came from. Open the source before relying on it.
Try before paying
A buyer can verify the claim themselves without paying ("Sign up for free").
Open sourceMeasured customer result
A possible mention appeared on a comparison or unrelated page, so we did not count it.
Open sourceDocumented limits
Documents where it falls short ("edge cases").
Open sourceTesting method
Describes how it was tested ("evaluation setup"; includes dataset).
Open sourceRecent product updates
No public changelog or releases page. A buyer cannot tell if this is actively maintained.
Open sourceAsk before you buy
These questions come from the information we could not verify on the public site.
- What measurable result has a customer like us achieved?
- How often is the product updated, and where are releases documented?
Compare the field
Showing 12 of 22 that match your filters.
PromptLayerpromptlayer.com
7/10website evidence$49 per month
No measured result we could find. No public changelog we could find.
- Price is on the site
- You can try it without paying
- Says what it cannot do
- Shows how it was tested
- No measured result we could find
- No public changelog we could find
Galileogalileo.ai
10/10website evidence$100 /month
Publishes more buying evidence than PromptLayer. Much dearer at $100 a month against $49. Publishes a measured result, unlike PromptLayer.
- Price is on the site
- You can try it without paying
- Publishes a measured result
- Says what it cannot do
- Shows how it was tested
- Actively maintained
DeepEvalconfident-ai.com
8.5/10website evidence$200 / month
Publishes about as much buying evidence as PromptLayer. Much dearer at $200 a month against $49. Publishes a measured result, unlike PromptLayer.
- Price is on the site
- You can try it without paying
- Publishes a measured result
- Shows how it was tested
- Actively maintained
- No stated limits we could find
Langfuselangfuse.com
8/10website evidence$29 / month
Publishes about as much buying evidence as PromptLayer. Cheaper at $29 a month against $49. Actively maintained, unlike PromptLayer.
- Price is on the site
- You can try it without paying
- Says what it cannot do
- Shows how it was tested
- Actively maintained
- No measured result we could find
Portkeyportkey.ai
8.5/10website evidence$49/month
Publishes about as much buying evidence as PromptLayer. Same price, $49 a month. Publishes a measured result, unlike PromptLayer.
- Price is on the site
- You can try it without paying
- Publishes a measured result
- Says what it cannot do
- Actively maintained
- No test method we could find
Agentaagenta.ai
6.5/10website evidence$29 /month
Publishes about as much buying evidence as PromptLayer. Cheaper at $29 a month against $49. Actively maintained, unlike PromptLayer.
- Price is on the site
- You can try it without paying
- Says what it cannot do
- Actively maintained
- No measured result we could find
- No test method we could find
Heliconehelicone.ai
6.5/10website evidence$79 per month
Publishes about as much buying evidence as PromptLayer. Dearer at $79 a month against $49. Actively maintained, unlike PromptLayer.
- Price is on the site
- You can try it without paying
- Says what it cannot do
- Actively maintained
- No measured result we could find
- No test method we could find
Humanloophumanloop.com
6.5/10website evidenceno price we could read
Publishes about as much buying evidence as PromptLayer. Publishes a measured result, unlike PromptLayer.
- You can try it without paying
- Publishes a measured result
- Says what it cannot do
- Actively maintained
- No price we could find
- No test method we could find
Patronuspatronus.ai
7.5/10website evidence$25/ Month
Publishes about as much buying evidence as PromptLayer. Cheaper at $25 a month against $49. Publishes a measured result, unlike PromptLayer.
- Price is on the site
- You can try it without paying
- Publishes a measured result
- Says what it cannot do
- No test method we could find
- No public changelog we could find
Promptfoopromptfoo.dev
7/10website evidenceno price we could read
Publishes about as much buying evidence as PromptLayer. Publishes a measured result, unlike PromptLayer.
- You can try it without paying
- Publishes a measured result
- Says what it cannot do
- Shows how it was tested
- No price we could find
- No public changelog we could find
Braintrustbraintrust.dev
4.5/10website evidenceno price we could read
Publishes less buying evidence than PromptLayer. Actively maintained, unlike PromptLayer.
- You can try it without paying
- Says what it cannot do
- Actively maintained
- No price we could find
- No measured result we could find
- No test method we could find
Freeplayfreeplay.ai
5.5/10website evidenceno price we could read
Publishes about as much buying evidence as PromptLayer. Publishes a measured result, unlike PromptLayer.
- You can try it without paying
- Publishes a measured result
- Says what it cannot do
- No price we could find
- No test method we could find
- No public changelog we could find
Lunarylunary.ai
4.5/10website evidenceno price we could read
Publishes less buying evidence than PromptLayer. Actively maintained, unlike PromptLayer.
- You can try it without paying
- Says what it cannot do
- Actively maintained
- No price we could find
- No measured result we could find
- No test method we could find
Read in August 2026 from pages anyone can open. This is what each company puts on its own site, which is not the same as how good the product is. Something excellent can still tell you very little. Spotted a mistake? Tell us and we will read it again.
Check a product we have not covered