Both are free to use. Senzii is open-source with AI shift matching, coverage detection, and MCP integration. Sling offers a free tier with built-in messaging, time tracking, and native apps. Full side-by-side comparison.
Both are free — but in different ways. Senzii is free and open-source (Apache 2.0) with no user limits, AI-powered shift matching, coverage gap detection, shift bidding, and MCP integration for managing schedules via ChatGPT or Claude. Sling offers a free tier for up to 30 users with basic scheduling, built-in team messaging, and native iOS/Android apps, plus paid plans that add time tracking and kiosk clock-in. Choose Senzii for AI scheduling and open-source flexibility. Choose Sling if you need time tracking, built-in messaging, or native mobile apps.
Senzii is free and open-source. Sling has a free tier (up to 30 users) and two paid plans.
| Feature | Senzii | Sling |
|---|---|---|
| Pricing model | Free & open-source (Apache 2.0) | Free (≤30 users) / Premium / Business |
| Free plan cost | $0 — no limits | $0 — up to 30 users |
| 10-person team cost | $0 | $0 (Free) / $20/mo (Premium) |
| 20-person team cost | $0 | $0 (Free) / $40/mo (Premium) |
| 50-person team cost | $0 | $0 (Free) / $100/mo (Premium) |
| User limit on free plan | None | 30 users |
| All features included | ✓ Yes — no tiers | ✗ Free tier limited; time tracking requires Premium+ |
| Paid plans | None — everything is free | Premium: $2/user/mo · Business: $4/user/mo |
| Free trial of paid features | N/A — all features are free | 15-day free trial of paid plans |
Sling pricing verified August 2026 from getsling.com. Senzii is free and open-source under the Apache License 2.0.
| Capability | Senzii (Free / OSS) | Sling (Free / Premium / Business) |
|---|---|---|
| AI-powered shift matching | ✓ Included | ✗ Not available |
| Auto-assign by skills & certifications | ✓ AI-powered | ✗ |
| Drag-and-drop schedule builder | Not yet | ✓ |
| Shift templates | ✓ | ✓ Premium+ |
| Coverage gap detection | ✓ Included | ✗ |
| Shift bidding | ✓ Included | ✗ |
| Shift swap (basic) | ✓ | ✓ Free + Paid |
| Time-off / PTO requests | ✓ | ✓ Free + Paid |
| Certification tracking | ✓ With expiration alerts | ✗ |
| Availability management | ✓ | ✓ |
| Audit trail | ✓ | ✓ |
| MCP integration (ChatGPT / Claude) | ✓ Included | ✗ |
| Time clock & time tracking | Not yet | ✓ Premium+ (mobile) / Business (kiosk) |
| Overtime alerts | Not yet | ✓ Premium+ |
| Labor cost reporting | Not yet | ✓ Premium+ |
| Kiosk clock-in | Not yet | ✓ Business only |
| Payroll reports | Not yet | ✓ Business only |
| Built-in team messaging | Not yet | ✓ All plans |
| Newsfeed / announcements | Not yet | ✓ All plans |
| Mobile app | Mobile-first web app | ✓ Native iOS + Android |
| Multi-location support | ✓ | ✓ |
| Push notifications | ✓ | ✓ |
| Integrations | MCP (ChatGPT, Claude) | POS integrations (Business) |
| Slack / Teams / Zapier | Not yet | ✗ |
| Payroll integrations | Not yet | ✓ Business only |
| Compliance / labor law alerts | Not yet | Basic (Business) |
| Analytics dashboard | Not yet | Limited (Premium+) |
| Open-source | ✓ Apache 2.0 | ✗ Proprietary |
Sling doesn't offer AI scheduling on any plan — free or paid. Senzii's AI-powered matching engine assigns the best employee to each shift based on skills, availability, and certifications. One click replaces manual scheduling work, and it's completely free and open-source.
Senzii includes MCP (Model Context Protocol) integration, so you can manage schedules through ChatGPT or Claude. Ask your AI assistant to find coverage, check gaps, or generate a weekly schedule — all without leaving your chat. Sling has no equivalent capability.
Sling shows your schedule but doesn't proactively identify understaffed periods. Senzii detects coverage gaps automatically and flags them before they impact operations. Know exactly where you're short — and get AI-recommended candidates to fill the gaps.
Senzii includes shift bidding — let employees bid on open shifts and the system matches the best candidate automatically. Sling only offers basic shift swaps. For teams with frequent open shifts, bidding streamlines the process significantly.
Senzii tracks employee certifications and alerts you before they expire. This is critical for healthcare, food service, and construction teams. Sling does not offer certification tracking on any plan.
Senzii is licensed under the Apache License 2.0. You can self-host it, modify it, and contribute back. No vendor lock-in, no surprise price increases, no per-seat fees — ever. Sling is proprietary and you're dependent on their pricing decisions.
Fair comparison — Sling has real strengths that Senzii doesn't match yet:
Sling offers mobile time tracking on Premium ($2/user/month) and a kiosk time clock on Business ($4/user/month). Senzii does not have a time clock, time tracking, or overtime alerts. If time tracking is essential, Sling's paid plans are the clear choice.
Sling includes chat, group messaging, and a newsfeed on all plans — even the free tier. Senzii doesn't have built-in messaging. If your team wants scheduling and communication in one app without using Slack or Teams, Sling is more convenient.
Sling has polished native mobile apps for iOS and Android. Senzii is a mobile-first web app — it works great on phones, but it's not a native app. If a native app experience is important to your team, Sling delivers that.
Sling's drag-and-drop schedule builder is intuitive and well-designed. Senzii focuses on AI-generated schedules and doesn't yet offer a drag-and-drop interface. If you prefer manual visual scheduling, Sling's builder is smoother.
Sling's Business plan includes payroll reports and integrations. Senzii doesn't currently integrate with payroll providers. If you need end-to-end scheduling-to-payroll workflows, Sling Business covers that.
In Sling, go to Settings → Export. Download your employee list, locations, and shift templates as CSV files.
Use Senzii's CSV import wizard. Map Sling's locations to Senzii locations, and shift templates to schedule templates. The wizard handles field mapping automatically.
Add certification data and availability preferences for each employee. Senzii's AI matching uses these to assign the right person to every shift.
Click "Auto-Generate Schedule" and let Senzii's AI build the optimal schedule. Compare it to your Sling schedule — most teams find the AI version covers more shifts with fewer conflicts.
If you were on Sling Free, simply stop using it. If you were on a paid plan, cancel your subscription. Your Senzii schedule is live with all features active — at no cost.
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 — no credit card, no per-seat fees, no tiers. AI shift matching, coverage detection, shift bidding, certification tracking, and MCP integration. All included.