Catch UX friction before the PR merges
You built the flow, so you know every state, every edge case, and every decision behind each click. That context is invisible to the user opening the page for the first time. Tessary runs AI personas on your staging URL and returns structured UX findings in minutes, before you open a PR or request a design review.
The person who built the flow cannot see where it breaks.
You remember every decision that went into the flow. You know what each state means, where the errors come from, and what happens after each click. That context is invisible to the people using it for the first time. The flow that felt obvious to the team often turns out not to be obvious to a user with a different mental model. The typical fix is to wait: for design review, for QA, for beta feedback. By the time signal comes back, the flow is in production and the rework costs more.
- 48%
of researchers say recruiting the right participants is their biggest challenge (User Interviews, State of User Research 2025)
User Interviews, State of User Research 2025
- 39%
of product managers now run their own user research outside any dedicated research function (Maze Future of User Research 2026)
Maze Future of User Research 2026
- $30k+
starting price for UserTesting, designed for enterprise research teams, not engineering workflows
From staging URL to findings before code review
No recruiting, no researcher coordination, and no waiting for feedback that arrives after the fix would have cost more.
Paste your staging URL
Works on any browser-accessible environment, including local tunnels (ngrok, Cloudflare Tunnel) and staging servers. No SDK or code changes required.
Configure a persona for your target user
Set the role, expertise level, and goal of the user you are building for. For example: "a finance manager at a 200-person SaaS company, unfamiliar with the billing dashboard, trying to update a payment method." The persona navigates as someone with exactly that background.
Review structured findings before the PR opens
Screenshots, hesitation points, interaction steps, and prioritized usability issues organized by severity. Results arrive in minutes. Reference them directly in your PR comment or share with a designer before review begins.
The friction engineers are structurally positioned to miss
These are not bugs. They are friction points that feel obvious once a user names them, but are invisible to the person who built the flow.
Unclear state transitions
The user does not know whether an action succeeded or is still processing. Engineers know the system state. Users only know what they see on screen.
Confusing error messages
Written from the system's perspective, not the user's. Engineers write error messages that make sense to someone who knows the implementation. Users need to know what to do next.
Navigation gaps
A user looking for a setting cannot find it because the label makes sense to someone who built the information architecture but not to someone encountering it fresh.
Missing feedback loops
Form submissions, async operations, and multi-step processes that leave users uncertain about what happened. Engineers know the operation completed. Users are left guessing.
Tessary vs. UserTesting and Maze for engineering use cases
Neither UserTesting nor Maze was built for the engineering use case. UserTesting targets enterprise research teams. Maze is designed for designers running prototype tests. Tessary is built for self-serve engineering workflows.
| Tessary | UserTesting · Maze | |
|---|---|---|
| Works on staging URLs | Yes | UserTesting: Yes · Maze: No |
| Recruiting required | No | UserTesting: Yes · Maze: Partial |
| Time to results | Minutes | UserTesting: Days to weeks · Maze: Hours |
| Built for self-serve engineering workflows | Yes | UserTesting: No · Maze: No |
| Starting cost | Free | UserTesting: $30,000+/year · Maze: Paid plans (~$99+/mo) |
| No credit card to start | Yes | UserTesting: No · Maze: No |
Self-directed usability testing is moving past research teams
According to the Maze Future of User Research 2026 report, 39% of product managers and 23% of marketers now run their own user research outside of any dedicated research function. Engineers are the next group moving into self-directed testing. The tooling has caught up. If your team is already running onboarding flow testing or using audience-specific personas for startup products, the engineering workflow runs on the same platform with no additional setup.
Maze Future of User Research 2026 ↗39%
of PMs run their own user research with no dedicated research team
23%
of marketers run their own studies. Engineers are the next segment making this shift.
Questions engineers ask about pre-PR usability testing
Related pages
Usability testing for product managers
For the PM on your sprint team running the same checks at planning time.
Usability testing for product designers
For the designer who hands you the flow before the PR is opened.
AI-powered usability testing
The methodology behind every Tessary session.
Maze alternative for B2B SaaS
For teams that want a real persona run on a real browser, not click maps.
Test your flow before the PR, not after.
Tessary's free tier gives engineers three sessions per month, no credit card required. Paste your staging URL, configure a persona, and get findings before the code review begins.