Saccade vs Testify

A/B testing. With your eyes. No surveys. No clicks. No opinions. Just look at two images and your unconscious gaze picks the winner. HOW IT WORKS 1. Upload your variants — two logos, four hero images, eight headshots. Add 2-12 images and Saccade generates every possible A/B pair. 2. Just look — each pair appears for 3-8 seconds. Your iPhone's TrueDepth camera tracks where your gaze lingers. You don't choose — your eyes do. 3. See what wins — instant ranked results with preference strength bars. Share the results card with your team, your client, or your group chat. WHY IT WORKS You can't fake where your eyes go. Research shows gaze duration correlates with preference — even when you know you're being tracked. It's called the gaze cascade effect, and it's been used in commercial eye-tracking studies for decades. WHAT PEOPLE TEST • Logo & brand variants • Photo selects from a shoot • Hero images & thumbnails • Color palettes & font samples • Baby names & vacation spots • Team & client testing — pass the phone around 100% PRIVATE • No account required — ever • No data leaves your device • No cloud, no analytics, no tracking • Camera used only for real-time gaze detection — no photos or video of your face are recorded Try Emoji Duel — a built-in game that lets you experience eye tracking instantly, no setup needed. Requires iPhone X or later.

Testify lets you run real experiments on your everyday life. Wondering if keeping your windows closed keeps your house warm? Curious whether wearing socks affects your productivity? Maybe you want to see if your sports team plays better if it is raining? Stop guessing and start testing. Set up an experiment with a hypothesis, track your results day by day, and let Testify crunch the numbers. The app automatically picks the right statistical test for your data — Chi-Squared for yes/no outcomes, or a Two-Sample T-Test for measurements — and tells you in plain language whether your results are meaningful or if you need more data. Features: - Create experiments with a hypothesis and a variable to test - Record trials with date, time, results, and optional contextual notes - Automatic statistical analysis with Chi-Squared and Welch's T-Test - Optional Bayesian view showing the probability one variant is better, with a 95% credible interval - Sequential analysis with a Pocock boundary so repeated peeking doesn't inflate false positives - Visual charts comparing your control and treatment groups, with a best-fit trend line for numeric experiments - Confidence intervals so you can see the range of possible effects - Post-hoc statistical power analysis - Sample size estimates that tell you how much more data you need - Plain-English explanations of your results — no stats degree required - Share polished result images with friends or social media - Daily reminders to log your data, with deep links straight to the experiment - Edit experiments and trials at any time, conclude or reopen as your investigation evolves - Track multiple experiments at once with a last-viewed summary card - Home screen widget showing your most recent experiment and a one-tap Add Trial shortcut - First-launch walkthrough to get you started quickly - Light and dark mode support Testify Pro (optional subscription): - Unlimited experiments - CSV import and export for your trial data - Multi-page PDF report export with charts, summary, and trial table Whether you're optimizing your daily routine, identifying patterns, or just settling a debate with yourself, Testify gives you the statistical tools to find out what actually works.