Upload screenshots, define your user and goal, and get prioritized issues, heuristics compliance, and fix recommendations in seconds.
Catch usability issues before users do. Tosin combines vision models with classical UX heuristics to deliver expert-quality reviews without the consultant price tag.
Upload up to 15 screenshots per analysis. The model inspects layout, hierarchy, contrast, and content density just like a senior designer would.
Every report scores your design against Nielsen-style heuristics and known UX laws (Fitts, Hick, Jakob, Miller, and more) with cited evidence.
Issues are ranked by severity (Blocker, Major, Minor) with rationale and a concrete fix so engineering can act without another meeting.
Stack multiple variants or full user flows into one batch. Compare side-by-side and reach decisions faster than A/B testing in production.
Local and staging let you choose between GPT-4o-mini for speed and GPT-4o for deeper reasoning. Production locks the model server-side for cost discipline.
Real-time batch status with per-step updates. Keep the tab open and watch each analysis stream from queued to complete.
Three steps. No setup. Run reviews in batch when you need to compare variants or audit a full flow.
Drop JPEG, PNG, WebP, or GIF up to 20MB each. Add as many variants as you want; Tosin handles batches natively.
Define the analysis goal, target user, and the problem you suspect. Context sharpens the model and dramatically improves accuracy.
Receive a structured report: user definition, area analysis, heuristics check, and prioritized issues with fixes you can ship today.
Quick answers to the most common questions about Tosin.
Tosin uses OpenAI vision-capable models. Production runs GPT-4o-mini by default and locks the choice server-side. On staging and local you can pick from the model dropdown in the form (GPT-4o-mini for speed, GPT-4o for deeper reasoning).
Images are sent to your configured worker, base64-encoded over HTTPS, and forwarded to the model provider you chose. Tosin itself does not persist your designs after the analysis completes.
Issues are ranked Blocker, Major, or Minor based on impact to the stated user problem and goal. Blockers prevent task completion; Major degrade efficiency or trust; Minor are polish-level.
Yes. Click "Add analysis" to stack up to 15 variants. Each one runs independently with its own goal, user, and screenshots. Use this to compare a redesign against the live page or to audit a multi-step flow.
Reports cite Fitts’, Hick’s, Jakob’s, Miller’s, Tesler’s, and the Aesthetic-Usability Effect, among others, only when the model finds a direct, defensible connection to the issue.
Batching gives each analysis its own context window and prioritization. Lumping everything into one prompt blurs the model and produces vague, generic findings.