Honest comparison
Assignar owns crew-and-plant scheduling for self-performing heavy-civil contractors; Site Control wins when you need per-site contractor access, induction gating, UK-CDM document generation and multi-company isolation at a transparent price.
Assignar is an operations platform — it dispatches crews and heavy equipment, collects geolocated timesheets and tracks competencies for self-performing heavy-civil contractors. Site Control is a per-site access and compliance product: it generates UK CDM documents (RAMS, CPP, COSHH), gates inductions before check-in, isolates each contractor company's data, and runs RFIs. Different jobs. Choose Assignar to schedule plant and crews; choose Site Control to control site access and CDM paperwork.
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Feature and positioning facts drawn from Assignar's public vendor pages (assignar.com) and the GetApp and Software Advice profiles, all fetched 2026-06-06. Assignar publishes no price list; the ~$27,500/yr figure is anecdotal and flagged indicative — confirm via a direct quote.
Pricing, fit, and feature coverage side by side.
| Feature | The Site Book Site Control | Assignar |
|---|---|---|
| Pricing | From £675/site per month plus £5,000 one-off setup; volume tiers and annual prepay | Quote-only annual subscription priced by active users plus modules, with a one-time onboarding fee. Anecdotal deployments land near US$27,500/yr (indicative, not a published rate). No public price list. |
| Team size | Per active site with unlimited workers (~75+ typical); multiple contractor companies per site | Mid-to-large self-performing contractors running dispatched crews and heavy equipment across multiple jobs; lighter for a single builder on one site. |
| Best for | Principal contractors and builders running live sites with subcontractors who need UK CDM documents generated plus on-site contractor access, attendance, RFIs and audit-ready evidence in one per-site tool. | Self-performing heavy-civil and infrastructure contractors that schedule crews AND expensive plant (cranes, excavators, paving rigs) and need timesheet-to-payroll ops, not a per-site access/compliance pack. |
| Not ideal for | No biometric turnstiles or physical access control, so it cannot secure a Tier-1 perimeter the way MSite/Biosite can. | Adjacent category: built for scheduling/ops, not per-site access and induction gating — no permanent-QR contractor self-sign-in or block-until-acknowledged induction. |
| RAMS / CPP / COSHH generation | Generates UK RAMS, CPP, COSHH and method statements from the project brief — unique in this category. | |
| Permits to work | Custom forms and pre-start checklists can model permit-style sign-offs, but there is no dedicated UK permit-to-work workflow out of the box. | |
| Site inductions | Digital induction blocks check-in until acknowledged. | Forms and competency checks gate work assignment, but it is operations gating (don't schedule an unqualified worker), not a self-serve digital induction that blocks check-in until acknowledged. |
| Worker cert tracking | CSCS upload, internal review and expiry notifications. | Strong competency/licence tracking; flags expired certs before a worker can be scheduled. A genuine core strength for heavy-civil compliance. |
| Right to work | CSCS credential review; not a formal right-to-work share-code check. | |
| Contractor self-onboarding | Contractor self-join via the entrance QR with CSCS upload and approval. | Worker records and forms are typically office-managed via the Field Worker app; no permanent-QR contractor self-join with credential upload like Site Access. |
| QR / mobile sign-in | Permanent entrance QR for guest sign-in/out and contractor self-join. | |
| GPS clock-in | Timesheet submissions can be geolocated; field time tracking with location is a core capability (though some user reviews rate GPS accuracy mixed). | |
| Biometric access | ||
| Physical access control | ||
| Site attendance | Check-in/out, history and a live people-on-site view. | Time & attendance is a core module — timesheets with hours, breaks, allowances, dockets, collected via the Field Worker app. |
| CIS payroll | Strong timesheet-to-pay flow and an Assignar Pay product plus Xero/QuickBooks/Sage integration, but built for US/AU payroll, not UK CIS deductions specifically. | |
| Live people-on-site | Scheduling and timesheets show who is assigned/clocked, but there is no purpose-built live muster/evacuation people-on-site board for emergency roll call. | |
| Multi-company isolation | Each contractor company sees only its own workforce — test-verified. | |
| RFIs | Create, attach, comment, answer and close — unique in this category. | |
| Document-review evidence | Version-specific read/acknowledge audit chain. | Digital signature capture on forms gives some acknowledgement evidence, but no version-specific read/acknowledge audit chain tied to document revisions. |
| Toolbox talks | Safety forms and pre-starts can carry toolbox content with sign-off, but there is no dedicated broadcast-and-acknowledge toolbox talk module. | |
| Site inspections | Customizable digital forms, inspection sheets and pre-start checklists are a core part of the platform's compliance/forms capability. | |
| Incident log | Incidents can be captured via custom forms, but there is no purpose-built incident register described in public materials. | |
| Plant / asset management | Strong asset/equipment tracking and scheduling of heavy plant (cranes, excavators) to prevent double-booking — a flagship differentiator. | |
| Workforce scheduling | Drag-and-drop crew and equipment scheduling/dispatch is the heart of the product; this is what Assignar is best known for. | |
| Multi-site dashboard & exports | Attendance CSV, monthly H&S CSV/PDF and project audit-log exports. | Real-time reporting and analytics dashboards across jobs, plus job costing and progress tracking; exports and accounting integrations included. |
| Mobile app | iOS and Android contractor app. | Dedicated Field Worker app (iOS/Android) for timesheets, forms, check-in and digital signatures. |
| Offline mode | Field Worker app supports field data capture for crews working in low-connectivity areas; full offline behaviour not clearly documented publicly. |
At-a-glance fit per product - pulled from the same data that drives the snapshot table.
Pick the option that matches how your team actually works.
Assignar is the stronger fit: drag-and-drop dispatch of crews and heavy equipment plus timesheet-to-payroll is its core. Site Control does not schedule plant or run dispatch and is honest about that — pair it alongside if you also need per-site access control and CDM docs.
Site Control wins: it generates RAMS/CPP/COSHH, gates inductions before check-in, isolates each contractor company's data and runs RFIs at a published per-site price. Assignar is an adjacent ops tool with no UK document generation, no QR self-sign-in and no multi-company isolation.
Consider both: Assignar for crew/plant scheduling and payroll, Site Control for per-site access, induction gating and CDM packs. Site Control will not replace Assignar's dispatch, and Assignar will not deliver UK document generation or multi-company isolation.
Strengths, weaknesses, fit, and the sources every claim came from.
The Site Book Ltd
From £675/site per month plus £5,000 one-off setup; volume tiers and annual prepay
Assignar
Quote-only annual subscription priced by active users plus modules, with a one-time onboarding fee. Anecdotal deployments land near US$27,500/yr (indicative, not a published rate). No public price list.
Site Control
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Per-site contractor access for principal contractors — talk to us about your live sites.
See it in action
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See how Site Control runs QR sign-in, CSCS, induction gating, attendance and RFIs on a live site.
Every TheSiteBook feature
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Short, straight answers - the same questions real builders ask.
Not really — they sit in adjacent categories. Assignar is an operations platform built to schedule crews and heavy equipment, collect geolocated timesheets and push hours to payroll for self-performing heavy-civil contractors. Site Control is a per-site access and compliance product: permanent entrance QR, contractor self-onboarding, induction gating before check-in, and UK CDM document generation. Assignar excels at dispatch; Site Control excels at controlling who is on site and the paperwork behind it.
No. Assignar handles custom digital forms, pre-start checklists and inspection sheets, but it does not author UK CDM documents such as RAMS, CPP or COSHH. Its compliance strength is competency and licence tracking — flagging an expired certificate before a worker is scheduled. Site Control's platform actually generates those UK CDM documents, which is the clearest dividing line between the two products for a UK builder or principal contractor.
Assignar uses quote-only enterprise pricing scaled by active users and modules, plus a one-time onboarding fee; an anecdotal figure of around $27,500 per year circulates but is indicative, not published. Site Control is transparent: £5,000 one-off setup plus £675 per active site per month, with volume tiers and annual prepay. Assignar's per-user model can grow with headcount, while Site Control prices per site with unlimited workers included.
No. Assignar is designed as a single self-performing contractor's operations system, so it does not provide multi-contractor-company data isolation where each subcontractor firm sees only its own people and documents. Site Control was built around exactly that need and verifies the isolation with tests. If your priority is a shared per-site portal where multiple firms operate without seeing each other's data, Site Control is the appropriate tool.
Assignar, clearly. Drag-and-drop scheduling and dispatch of both crews and heavy plant — cranes, excavators, paving rigs — to prevent double-booking is its flagship capability, alongside job costing and timesheet-to-payroll. Site Control is honest about its gaps here: it does not do workforce scheduling, dispatch or plant/asset management. If scheduling expensive equipment is your central problem, Assignar is the stronger choice and Site Control is a complement, not a replacement.
Yes, and for some contractors that is the best answer. Assignar handles crew and equipment scheduling, geolocated timesheets and payroll; Site Control handles per-site contractor access, induction gating, RFIs, document-review evidence, multi-company isolation and UK CDM document generation. They overlap little, so a heavy-civil firm could run Assignar for operations and deploy Site Control per project for site access and compliance paperwork without significant duplication.
Feature and positioning facts drawn from Assignar's public vendor pages (assignar.com) and the GetApp and Software Advice profiles, all fetched 2026-06-06. Assignar publishes no price list; the ~$27,500/yr figure is anecdotal and flagged indicative — confirm via a direct quote.
Every pricing, feature, and fit claim in this comparison is pulled from public vendor documentation and cross-checked against independent sources. The “source basis” footer on each product card lists the exact URLs and the date we fetched them. We revisit this page at least every 90 days - last reviewed on .