Full feature, pricing, and capability comparison. Senzii is free and open-source under the Apache License 2.0 with AI-powered shift matching. When I Work offers tiered paid plans with GPS time clock, native apps, and team messaging.
Senzii wins on price (free and open-source vs When I Work's $2.50–$8/user/month), AI-powered shift matching (Senzii has a find_candidates + assignment engine, When I Work has auto-scheduling), and MCP integration for managing schedules via ChatGPT or Claude. When I Work wins on GPS time clock with geofencing, native iOS/Android apps, built-in team messaging, payroll integrations, and a large integration marketplace. For teams that want a free, self-hostable, AI-first scheduler, Senzii is the stronger choice. For teams that need time tracking, mobile apps, and payroll out of the box, When I Work is more complete today.
Senzii is free and open-source. When I Work uses tiered per-user pricing.
| Feature | Senzii | When I Work |
|---|---|---|
| Pricing model | Free & open-source | Tiered: $2.50–$8/user/month |
| 10-person team cost | $0/month | $25–$80/month |
| 20-person team cost | $0/month | $50–$160/month |
| 50-person team cost | $0/month | $125–$400/month |
| Base fee | None | None |
| Per-seat fee | $0 | $2.50–$8/user/month |
| Free trial | Free forever — no trial needed | 14 days, no credit card required |
| Setup fee | $0 | $0 |
| Contract required | No | No |
| Open source | ✓ Apache License 2.0 | ✗ Proprietary |
When I Work pricing verified August 2026 from wheniwork.com/pricing. Senzii is free and open-source under the Apache License 2.0.
| Capability | Senzii | When I Work |
|---|---|---|
| AI-powered shift matching | ✓ find_candidates + assignment engine | Auto Scheduling (all plans) |
| Schedule templates | ✓ | ✓ |
| Drag-and-drop schedule builder | Not yet | ✓ |
| Auto-assign by skills & certifications | ✓ AI-powered matching | ✓ Auto Scheduling |
| Availability management | ✓ | ✓ |
| Certification tracking | ✓ | ✗ |
| Coverage gap detection | ✓ | ✗ |
| Shift swap | ✓ Basic | ✓ OpenShifts |
| Shift bidding | ✓ | ✗ |
| PTO / time-off requests | ✓ | ✓ |
| MCP integration (ChatGPT/Claude) | ✓ Manage schedules via AI assistants | ✗ |
| API access | ✓ Open-source (self-hostable) | ✓ Premium only ($8/user) |
| Time clock | Not yet | ✓ GPS + geofencing (all plans) |
| GPS location verification | ✗ | ✓ |
| Photo clock-in / biometrics | ✗ | ✗ |
| Mobile app | Mobile-first web app | ✓ Native iOS + Android |
| Push notifications | ✓ Web notifications | ✓ |
| Multi-location support | ✓ | ✓ |
| Team messaging | ✗ | ✓ Built in (all plans) |
| Payroll integrations | ✗ | ✓ Rippling partner + POS integrations |
| Slack / Teams / Zapier | ✗ | ✓ |
| Compliance & labor law monitoring | ✗ | ✓ Basic |
| Overtime alerts | ✗ | ✓ |
| Break enforcement | ✗ | ✗ |
| Labor law alerts by state | ✗ | ✗ |
| Analytics dashboard | Not yet | ✓ Custom reporting (Pro) |
| Audit trail | ✓ | ✓ |
| Self-hostable | ✓ | ✗ |
When I Work's Auto Scheduling fills shifts based on availability and roles. Senzii goes further with a find_candidates + assignment engine that scores each candidate by skills, certifications, and availability — matching the right person to the right shift, not just any available person.
When I Work charges $2.50–$8 per user per month, every month, forever. Senzii is free and open-source under the Apache License 2.0. No per-seat fees, no tiers, no base fees. A 20-person team saves $600–$1,920 per year. You can self-host it and own your data.
Senzii supports the Model Context Protocol (MCP), so you can manage schedules directly from ChatGPT or Claude. Ask your AI assistant to find coverage, check gaps, or assign shifts — without opening a separate app. When I Work has no equivalent integration.
When I Work shows you your schedule but doesn't proactively warn you about gaps. Senzii automatically detects uncovered shifts and understaffed periods so you can fix them before they cost you.
Senzii includes shift bidding, letting employees bid on open shifts so managers can assign based on preferences and qualifications. When I Work's OpenShifts feature allows claiming shifts but doesn't support a bidding workflow.
Senzii tracks employee certifications and skills as part of its matching engine. When I Work does not offer certification tracking. For teams in healthcare, food service, or regulated industries, this matters — Senzii won't assign an employee to a shift their certifications don't cover.
We're transparent. Here's where When I Work has an edge today:
When I Work includes a time clock with GPS and geofencing on all plans — employees can only clock in from approved locations. Senzii does not have a time clock feature. If time tracking is essential, When I Work is the clear choice.
When I Work offers native mobile apps for iOS and Android with push notifications, offline access, and a polished mobile experience. Senzii is a mobile-first web app — it works on any phone with a browser, but it's not a native app.
When I Work includes team messaging on all plans — no need for a separate Slack or Teams subscription. Senzii does not have built-in messaging. If you want scheduling and chat in one app, When I Work delivers.
When I Work integrates with payroll providers (Rippling partnership) and POS systems. Senzii does not have payroll integrations. If you need to push time data to payroll automatically, When I Work has this built in.
When I Work's drag-and-drop schedule builder is polished and intuitive. Senzii does not yet have a drag-and-drop interface — schedules are generated and managed through its matching engine and templates.
When I Work integrates with Slack, Teams, Zapier, and dozens of other tools. Senzii's integration story is currently limited to MCP. If you need a broad integration marketplace, When I Work has more options today.
Go to When I Work → Settings → Export Data. Export your employee list, shift templates, and time-off policies as CSV files.
In Senzii, go to Settings → Import. Upload your CSV files. Senzii maps fields automatically and flags any conflicts for review.
Verify employee profiles, set up your locations, and confirm certifications and availability. Most teams complete this in 30 minutes.
Use Senzii's find_candidates and assignment engine to match employees to shifts based on skills, certifications, and availability. Review, adjust, and publish. Your team gets instant notifications.
Once your team is on Senzii, cancel your When I Work subscription. No cancellation fees, no data loss — your Senzii schedule is live and free forever.
Try these free scheduling tools — no signup required:
Color-coded weekly coverage heatmap. Spot gaps, overstaffing, and optimization opportunities at a glance.
Benchmark your labor costs vs industry averages
CalculatorTrue cost per shift: wages, breaks, OT risk, gap risk, payroll taxes, and productivity loss breakdown.
PlannerCompare team capacity vs weekly demand. Spot gaps and surpluses with visual bars and cost impact estimates.
Scorecard8-dimension scheduling efficiency scorecard with letter grade, dimension breakdown, and prioritized improvement playbook.
BudgetSet your monthly labor budget, add shifts, and see if your schedule fits. Daily cost breakdown, overrun alerts, overtime analysis.
ComparatorCompare 6 common shift patterns (5x8, 4x10, 3x12, 2-2-3 Panama, DuPont, Pit) side by side: cost, coverage, overtime, satisfaction, compliance.
Auto-generate balanced weekly schedules from your roster
ROI EstimatorOptimize open shift assignments
Senzii is free and open-source under the Apache License 2.0. AI-powered shift matching, certification tracking, coverage gap detection, and MCP integration. No per-seat fees, no tiers, no credit card.