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fullstack-builder / rank 5 of 41 / cycle 04

Lovable benchmark

Strongest single shot agent in the cohort. It read the tenancy requirement in prompt 1 without being told twice and carried the organisation scope through every later prompt. It lost points on the machine facing surface: webhook signing needed an explicit follow up in 3 of 5 runs, and the generated API had no idempotency handling.

Last run: 14 Aug 2026 17:40 UTCNext scheduled run: 21 Aug 2026 09:00 UTCOfficial siteLovable reviews and ratings

Composite index

77.87

of 100 | 1 versus cycle 03

At a glance

Composite index

77.87

rank 5 of 41

Rank

#5

of 41 measured builders

Median speed

85.2 s

p10 52.6 s, p90 133.1 s

Reliability

82.2%

strict pass rate

SEO score

75.0

0 to 100, SEO and GEO axis

Three strongest axes

  • Design output92.0
  • Agent performance89.0
  • Integrations86.0

Three weakest axes

  • Speed36.9
  • API and MCP66.0
  • Value74.0

Median per prompt

85.2 s

p10 52.6 s, p90 133.1 s

Strict pass rate

82.2%

37 pass, 6 partial, 2 fail

Executions recorded

45

5 runs of 9 prompts

Entry price

EUR 21.00

Cheapest plan that can finish the specification

Per axis subscores

Composite recomputed from these ten rows: 77.87. That is the arithmetic behind the index, and you can repeat it by hand.

Per axis subscores against the roster median, and weighted contribution
AxisSubscore 0 to 100, tick is the roster medianScoreMedianWeight %Contribution
Agent performance89.075.01816.02
Reliability82.271.11814.80
Scalability78.070.01310.14
SEO and GEO75.058.0129.00
API and MCP66.062.095.94
Integrations86.066.086.88
Design output92.071.076.44
Speed36.933.072.58
Value74.076.053.70
Code ownership79.090.032.37

Speed distribution

Every recorded prompt duration for Lovable, in seconds. The cyan tick on the whisker is the median.

min 36.7 smax 179.9 s

Spread against the cohort

p10 52.6 s / median 85.2 s / p90 133.1 s

Scale is shared with every product in the cohort, so the bars are directly comparable between pages. Ratio of p90 to median is 1.56x.

Outcome split

37 pass / 6 partial / 2 fail

SEO and GEO measurements

Taken from the public marketing page this product generated in prompt 8, fetched with JavaScript disabled.

HTML bytes, no JS

18.0 KB

18,432 bytes of real text content with scripts blocked

LCP

2,140 ms

Throttled connection, cold cache

CLS

0.060

Cumulative layout shift on load

SEO and GEO subscore

75.0

0 to 100, worth 12 index points

Raw run data: 45 executions

One row per prompt execution. Nothing is aggregated away, nothing is hidden, including the failures.

Raw per run measurements
RunPromptPrompt targetStartedDuration (s)OutcomeNote
R01P01Tenant and user model11 Aug 2026 08:00 UTC62.3failDeployed URL returned 500 on every request.
R01P02Authentication and session11 Aug 2026 08:03 UTC115.3pass
R01P03Projects CRUD with tenancy11 Aug 2026 08:06 UTC115.3pass
R01P04Public REST API with keys11 Aug 2026 08:10 UTC58.9pass
R01P05Outbound webhooks with signatures11 Aug 2026 08:13 UTC120.7partialWebhook payloads delivered unsigned. HMAC header added only after an explicit follow up instruction.
R01P06Background jobs11 Aug 2026 08:17 UTC126.0pass
R01P07Admin panel11 Aug 2026 08:21 UTC80.7partialError envelope inconsistent between two of the endpoints.
R01P08Public marketing surface11 Aug 2026 08:25 UTC72.9pass
R01P09Hardening pass11 Aug 2026 08:28 UTC50.2pass
R02P01Tenant and user model12 Aug 2026 08:00 UTC77.1pass
R02P02Authentication and session12 Aug 2026 08:03 UTC101.5pass
R02P03Projects CRUD with tenancy12 Aug 2026 08:06 UTC82.5pass
R02P04Public REST API with keys12 Aug 2026 08:10 UTC86.9pass
R02P05Outbound webhooks with signatures12 Aug 2026 08:13 UTC73.0pass
R02P06Background jobs12 Aug 2026 08:17 UTC137.7partialDelivered the main path, missed the boundary case named in the pass criteria.
R02P07Admin panel12 Aug 2026 08:21 UTC93.7pass
R02P08Public marketing surface12 Aug 2026 08:24 UTC56.1pass
R02P09Hardening pass12 Aug 2026 08:27 UTC107.2pass
R03P01Tenant and user model13 Aug 2026 08:00 UTC129.3pass
R03P02Authentication and session13 Aug 2026 08:04 UTC85.2pass
R03P03Projects CRUD with tenancy13 Aug 2026 08:07 UTC73.2pass
R03P04Public REST API with keys13 Aug 2026 08:10 UTC98.9pass
R03P05Outbound webhooks with signatures13 Aug 2026 08:14 UTC179.9partialWebhook payloads delivered unsigned. HMAC header added only after an explicit follow up instruction.
R03P06Background jobs13 Aug 2026 08:19 UTC127.8pass
R03P07Admin panel13 Aug 2026 08:23 UTC65.1pass
R03P08Public marketing surface13 Aug 2026 08:26 UTC65.6pass
R03P09Hardening pass13 Aug 2026 08:29 UTC71.6pass
R04P01Tenant and user model14 Aug 2026 08:00 UTC70.0pass
R04P02Authentication and session14 Aug 2026 08:03 UTC36.7pass
R04P03Projects CRUD with tenancy14 Aug 2026 08:05 UTC72.4pass
R04P04Public REST API with keys14 Aug 2026 08:08 UTC100.3pass
R04P05Outbound webhooks with signatures14 Aug 2026 08:12 UTC146.5partialWebhook payloads delivered unsigned. HMAC header added only after an explicit follow up instruction.
R04P06Background jobs14 Aug 2026 08:17 UTC115.5pass
R04P07Admin panel14 Aug 2026 08:21 UTC147.0pass
R04P08Public marketing surface14 Aug 2026 08:25 UTC86.8pass
R04P09Hardening pass14 Aug 2026 08:28 UTC77.3pass
R05P01Tenant and user model15 Aug 2026 08:00 UTC40.2pass
R05P02Authentication and session15 Aug 2026 08:02 UTC67.1pass
R05P03Projects CRUD with tenancy15 Aug 2026 08:05 UTC95.8pass
R05P04Public REST API with keys15 Aug 2026 08:09 UTC42.1pass
R05P05Outbound webhooks with signatures15 Aug 2026 08:12 UTC63.7failGenerated migration conflicted with the existing schema and was not reconciled.
R05P06Background jobs15 Aug 2026 08:15 UTC135.7pass
R05P07Admin panel15 Aug 2026 08:19 UTC121.7pass
R05P08Public marketing surface15 Aug 2026 08:23 UTC86.1partialRequired one clarifying instruction before the criterion was met.
R05P09Hardening pass15 Aug 2026 08:26 UTC43.9pass

Pricing

Free tier with a small daily credit allowance. Paid plans from EUR 21 per month, metered per agent message.

Entry price
EUR 21.00
Value subscore
74.0
Index points per euro
3.71

Capabilities as measured

stack
React and Vite with a hosted Postgres backend
deploy
One click hosted deploy with preview URLs
database
Managed Postgres with a visual schema editor
auth
Built in email, OAuth and row level policies
background jobs
Yes, scheduled and queued functions
webhooks
Outbound supported, signing needs prompting
rest api
Generated per project, versioning is manual
mcp server
Yes, official connector
export code
Full source export and GitHub sync
custom domain
Yes on paid plans
ssr
Client rendered by default, server rendering on request

Screenshot

Lovable landing page, captured by the lab on 14 Aug 2026 at 1440 by 900. Stored locally, never hotlinked.

Lovable landing page, captured by the lab at 1440 by 900

Lovable, captured 14 Aug 2026.

Sources and fetch dates

Every claim on this page traces to one of these.

Sources with fetch dates
SourceURLFetched
Lovable pricing pagehttps://lovable.dev/pricing14 Aug 2026
Lovable product sitehttps://lovable.dev14 Aug 2026
LLM Tier run harness outputhttps://www.llm-tier.com/api/runs.json14 Aug 2026

Rich results carry this composite as 3.9 on a 0 to 5 scale because that is the only scale the format accepts. The number on this page, 0 to 100, is the real one.

Lovable head to head

Reader index

Voted by readers with an account, one score per person per axis. Published beside the lab index, never inside it.

Reader index

82.79

Lab index

77.87

6 readers, 55 axis scores, last change 14 Aug 2026. Readers rate Lovable 4.9 points above the measurement.

Reader mean against the measured lab subscore for each axis
AxisWeightLabReadersVotesReader mean
Agent performance18%89.095.36
Reliability18%82.287.56
Scalability13%78.085.56
SEO and GEO12%75.078.06
API and MCP9%66.061.84
Integrations8%86.092.26
Design output7%92.099.65
Speed7%36.942.26
Value5%74.079.86
Code ownership3%79.085.34

The reader index is a weighted mean of reader submitted axis scores using the published index weights, renormalised over the axes readers have scored. It is never blended into the lab index. How this works.

Open rating mean

85.33

3 published open ratings, submitted without an account

Lab index

77.87

Measured, not voted

Gap to the measurement

7.46

Positive means open raters put it above the measurement

What agent performance looked like in practice

Strongest single shot agent in the cohort. It read the tenancy requirement in prompt 1 without being told twice and carried the organisation scope through every later prompt. It lost points on the machine facing surface: webhook signing needed an explicit follow up in 3 of 5 runs, and the generated API had no idempotency handling.

Across 45 recorded executions this product met the published pass criterion cleanly 37 times, partially 6 times and failed 2 times. The rows above carry the reviewer note for every non clean outcome, which is the only way to tell a product that fails loudly from one that fails quietly.