TruLens
TruLens is a local RAG eval leaderboard: you instrument an app, score groundedness / relevance / latency, and compare versions on a dashboard.
OUR TAKE
Pick TruLens for RAG teams who will run TruLens locally at $0 (you bring compute and judge-model keys) — not Arize first unless they want hosted Signal at $50. $0 is the library, not judge tokens.
Good fit
RAG teams who will run TruLens locally at $0 (you bring compute and judge-model keys) — not Arize first unless they want hosted Signal at $50.
Poor fit
TruLens (self-run)
USD, before tax · Checked 2026-10-27 · trulens.org
OUR TAKE
Pick TruLens for RAG teams who will run TruLens locally at $0 (you bring compute and judge-model keys) — not Arize first unless they want hosted Signal at $50. $0 is the library, not judge tokens. Groundedness calls still hit your model bill.
Good fit
RAG teams who will run TruLens locally at $0 (you bring compute and judge-model keys) — not Arize first unless they want hosted Signal at $50.
Poor fit
TruLens (self-run)
USD, before tax · Checked 2026-10-27 · trulens.org
What it costs
USD, before tax · Checked 2026-10-27 · trulens.org
TruLens (self-run)
MIT / Apache. License fee . Local dashboard. You pay your own LLM judge tokens and machines
$0
Hosted / Snowflake packaging
Not published by the vendor
Not published by the vendor
Checked 2026-10-27·trulens.org
Before you pay
Good fit
RAG teams who will run TruLens locally at $0 (you bring compute and judge-model keys) — not Arize first unless they want hosted Signal at $50.
Watch out
$0 is the library, not judge tokens. Groundedness calls still hit your model bill.
Instead, try
Phoenix if OTel traces + experiments when you want Phoenix $0 self-host; Langfuse if traces / evals you can self-host when you want Langfuse’s public Cloud $
Compare TruLens with
Limits, in full
- 01
$0 is the library, not judge tokens. Groundedness calls still hit your model bill.
- 02
No public hosted $. Quote only the OSS $0 license.
- 03
A Leaderboard, not Arize’s Signal issues list. For that hosted see Arize.
If TruLens isn't it
Why: OTel traces + experiments when you want Phoenix $0 self-host.
Free· paid from$50/mo
ELv2, not ApacheChecked 2026-10-27·arize.com/pricing
vs TruLens
Why: traces / evals you can self-host when you want Langfuse’s public Cloud $.
Free· paid from$2/mo
Hobby is two users and 30-day retentionChecked 2026-10-19·langfuse.com/pricing
vs TruLens
Why: a Python eval harness when you want DeepEval + Confident AI $0 / $200.
Free· paid from$2/mo
$0 is the library, not judge tokensChecked 2026-10-27·confident-ai.com/pricing
vs TruLensLimits & alternatives3 limits · Phoenix, Langfuse, DeepEval instead
Limits, in full
- 01
$0 is the library, not judge tokens. Groundedness calls still hit your model bill.
- 02
No public hosted $. Quote only the OSS $0 license.
- 03
A Leaderboard, not Arize’s Signal issues list. For that hosted see Arize.
If TruLens isn't it
Why: OTel traces + experiments when you want Phoenix $0 self-host.
Free· paid from$50/mo
ELv2, not ApacheChecked 2026-10-27·arize.com/pricing
vs TruLensWhy: traces / evals you can self-host when you want Langfuse’s public Cloud $.
Free· paid from$2/mo
Hobby is two users and 30-day retentionChecked 2026-10-19·langfuse.com/pricing
vs TruLensWhy: a Python eval harness when you want DeepEval + Confident AI $0 / $200.
Free· paid from$2/mo
$0 is the library, not judge tokensChecked 2026-10-27·confident-ai.com/pricing
vs TruLens