Turn your email campaigns into revenue experiments
Test individual content blocks inside your emails, identify winners with statistical confidence, and measure results in incremental revenue rather than open rates.
14-day free trial. No credit card required.
Subject Line Test #12
Sample size: 1,240 of 5,000 target
62% confidence
CTA Colour Test (Blue vs Green)
Conversion rate: 2.7% vs 2.6% (control)
88% confidence
Hero Variant B (Urgency)
Conversion rate: 3.1% vs 2.5% (control)
+£14,200 additional revenue
97% confidence
The Problem with Traditional Email Testing
Most CRM teams rely on campaign level A/B testing. This approach introduces structural limitations that restrict learning and waste audience traffic.
Whole Email Testing is Low Resolution
Testing entire emails forces multiple creative decisions into a single experiment. When performance changes, you cannot isolate what actually drove the outcome.
Results Do Not Compound
Each test lives and dies within a campaign. There is no persistent memory of what content strategies work best over time.
Metrics Do Not Reflect Business Impact
Winning open rates or click through rates does not guarantee winning revenue.
How liftstack Works
Four steps from content variants to revenue-denominated verdicts.
Create Snippets
Build a library of content variants: headlines, CTAs, hero blocks, product descriptions. Each snippet has a control and one or more alternative variants.
Build Your Campaign
Connect snippets to slots in your email. Choose your primary metric and how traffic is allocated.
Assign and Send
liftstack assigns each recipient a variant per slot, writes it to their profile, and generates a conditional template. Your platform sends as normal.
Read Your Verdict
After sufficient data, liftstack delivers a clear verdict with revenue impact: winner found, no meaningful difference, or more data needed.
See your potential revenue uplift
Adjust the inputs to match your business. The results show what a conservative 0.3% conversion rate improvement could mean for your revenue.
If liftstack improves your conversion rate from 2.5% to 2.8%:
+£66,000/month
+£792,000/year
That's 132x your liftstack investment on the Growth plan.
What Makes liftstack Different
Decision Level Testing
Optimise individual content decisions rather than entire campaigns. Test a hero headline, a CTA, and a product description independently within the same email.
Revenue Denominated Outcomes
Measure success in incremental revenue rather than engagement metrics. Every verdict tells you how much additional revenue the winning variant generated.
Probability Based Verdicts
Understand how confident you should be in each decision. See the probability each variant is best, the size of the improvement, and the range of plausible values.
Compounding Content Memory
Build persistent intelligence about what works for your audience. Snippets accumulate performance data across campaigns so patterns emerge over time.
How liftstack Compares
See where liftstack fits between native CRM testing and enterprise AI platforms.
| Native CRM A/B Test | liftstack | Enterprise AI | |
|---|---|---|---|
| Test level | Whole email only | Individual content blocks | Individual elements |
| Variants per test | 2–4 per email | 2–5 per slot, multiple slots | Unlimited |
| Statistics | Frequentist significance | Bayesian with plain-language verdicts | Black-box ML |
| Metrics | Open or click rate | Open, click, conversion, revenue per exposure | Varies |
| Uplift measurement | Basic percentage difference | Revenue-denominated with confidence ranges | Varies |
| Cross-campaign learning | None | Built-in snippet performance library | Platform-dependent |
| Smart allocation | Auto-send winner | Thompson Sampling with transparency | Reinforcement learning |
| Audience requirement | 10,000+ for reliable results | 5,000+ per send | 100K+ typically |
| Marketer control | Full | Full (you see every decision) | Low (trust the algorithm) |
| Setup complexity | Built-in | Connect API, create snippets, send | CDP + data warehouse + onboarding |
| Price | Included in platform | Mid-market SaaS | Enterprise sales-led |
Test level
Variants per test
Statistics
Metrics
Uplift measurement
Cross-campaign learning
Smart allocation
Audience requirement
Marketer control
Setup complexity
Price
Works with the tools you already use
liftstack connects via API to read audience profiles, write custom properties, and receive engagement events. No workflow replacement required.
Your team keeps sending through your existing platform. liftstack handles the experimentation layer.
“Designed for DTC and e-commerce brands doing £5M–50M in annual revenue.”
“The same Bayesian methodology used in clinical trials, applied to your email content decisions.”
Start compounding revenue from the emails you already send
14-day free trial on the Growth tier. No credit card required.