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Product decision engine

Predict experiment outcomes before you run them.

qombine adds a simulation layer to product development.

It learns how users move through your product from analytics events and simulates thousands of sessions to predict how product changes will affect conversion, retention, and revenue.

Run a backtest Simulate a new idea
qombine simulation output EXPERIMENT remove onboarding step predicted impact before design or build conversion +3.2% activation +1.1% retention -0.4% CONFIDENCE medium SIMULATED SESSIONS 20,000 example prediction output

Decision loop

Without Qombine

idea → build → experiment → learn

With Qombine

idea → simulate → experiment → learn

Decide which experiments are worth running.

Qombine models real user journeys from event data and uses simulation to estimate how product changes affect behavior across your funnel.

Behavioral journey modeling

Convert analytics events into session journeys and transition models. Qombine learns how users move through your product before running simulations.

Experiment simulation

Define experiment variants and simulate thousands of sessions to estimate how behavior and conversion rates change.

Decision-ready outputs

See predicted lift, confidence ranges, and funnel impact for each variant before running the real experiment.

analytics events ga4 / amplitude session reconstruction user journeys behavioral model transition probabilities simulation engine synthetic sessions predicted outcomes conversion lift

How Qombine models user behavior

  1. Import event data: Upload analytics events or past experiment logs to reconstruct user journeys.
  2. Learn behavioral transitions from session data: Qombine builds a model of how users move through your funnel.
  3. Simulate experiment variants at scale: Run thousands of simulated sessions to estimate behavioral impact.
  4. Predict outcomes: See expected lift, funnel changes, and confidence ranges for each variant.

Validate predictions with past experiments

Qombine can replay historical experiments to evaluate prediction accuracy. Train the behavioral model on pre-experiment data, simulate each variant, and compare predicted outcomes with real experiment results.

Experiment replay

Run Qombine on historical experiments to evaluate prediction accuracy.

Winner prediction

See whether Qombine predicted the correct variant direction.

Prediction error

Compare predicted lift against real experiment results.

Experiment replay

Run Qombine on historical experiments to evaluate prediction accuracy.

Winner prediction

See whether Qombine predicted the correct variant direction.

Prediction error

Compare predicted lift against real experiment results.

Who this is for

Qombine is a simulation layer for product experimentation. Teams use it to test ideas before running experiments on users.

  • Growth teams

    Prioritize experiments with the highest expected impact.

  • Product teams

    Evaluate product changes before investing design or engineering effort.

  • Experimentation teams

    Use simulation to increase experiment velocity.