Fenster features 2026 — what Fenster can do (and what it can't)

Why a feature walkthrough?

When window cleaners consider switching to or from Fenster, the most common Google search isn't 'fenster price' — it's 'what can Fenster do'. That makes sense: before moving a whole business, you want to know exactly which features you get and which you don't.

We've migrated several customers from Fenster, so we know the product from both the user side and the data integration side. This is an honest walkthrough — not a marketing pitch. If Fenster fits your needs, that's also good to know. If it doesn't, you want to know before spending 6 months on a system you outgrow.

If you want the short version, start with the Fenster review. Below we go more systematically through each feature.

Calendar & planning

Fenster's calendar is the tool's strongest side. It's simple, fast and built for window cleaners — you create a customer, set a frequency (every 8 weeks, every month etc.), and Fenster automatically places the jobs in the calendar.

It works well as long as your routes are static. If you plan the same tour every Tuesday in Hvidovre and every Wednesday in Glostrup, Fenster keeps track. If you need dynamic replanning — e.g. because a customer cancels at 9am — Fenster is manual: you move stops around yourself.

In Clientflow, the calendar is built on the same principle but with AI route optimization on top. When a customer cancels, the system replans the rest of the day automatically and updates the worker's phone. If you want to dive into the difference, we've written about route optimization for window cleaners with concrete numbers.

Routes & route optimization

Fenster has basic route management — you can create routes, assign customers and see a map order. It covers a solo window cleaner with fixed tours.

What Fenster doesn't have is real route optimization. The algorithm doesn't compute the shortest path between stops — you assess the order yourself, and with 15-20 stops a day it becomes mathematically impossible to do optimally. Our measurements show manual planning typically costs 20-30% in unnecessary drive time. That's an area where Clientflow has a concrete advantage.

Read our deep dive on route optimization if you want to understand why it's such a big deal.

Subscriptions & recurring agreements

This is Fenster's core use case — subscriptions on recurring customers. Fenster handles it well: you set price, frequency, cancellation rule, and it auto-generates jobs in the calendar.

Limitations appear with price versioning. If you've done a price increase and need to put old vs new customers on different prices, or want to handle temporary pauses, Fenster isn't very flexible. Clientflow has built subscription handling out a bit further — but for most it's a marginal difference.

To understand how we think about subscriptions at the system level, the problems page on recurring contracts is the most detailed place.

Customer registry

Fenster has a simple, usable customer database. Name, address, phone, email, a notes field. That's enough for a solo window cleaner.

What Fenster doesn't have: segmentation (mark a customer as 'A-customer' or 'seasonal'), photos per customer (image of windows or access route), or rich timestamped notes (who called when about what). At 200 customers you cope — at 1000+ the simple structure starts costing time.

Clientflow has built the customer registry as the heart of the system — all interactions (calls, SMS, email, visits, invoices) collect on the customer card automatically. Especially useful if multiple workers talk to the same customer.

Mobile

Fenster has no dedicated mobile app. You use it in your phone's browser — it covers today's jobs, customer info and route overview, but a web page in a browser is not the same thing as a real app.

What Fenster on mobile doesn't have: GPS tracking (you can't see where workers are), automatic navigation (you open Google Maps yourself), photo documentation (no image field per job), check-in timestamp for payroll, and MobilePay payment directly from the job.

Clientflow's day plan app does all the above natively — in a real app for iOS and Android, not a browser tab. The difference is biggest if you have 2+ workers out simultaneously — then GPS, timestamps and photos become real daily tools, not nice-to-haves.

Communication & SMS

Fenster can send SMS reminders. It works and you can use templates. SMS is 0.375 kr/each on top of the subscription — at 200+ SMS/mo it adds up visibly.

What Fenster doesn't have: internal team chat (workers use Messenger or WhatsApp on the side), calls logged automatically (you don't know who called whom), or email thread per customer (everything in your own Gmail).

Clientflow collects all that in the communications module — calls, SMS and email log automatically on the customer card, with internal team chat so Messenger isn't used for work.

Invoicing & bookkeeping

Fenster can generate invoices from jobs. Dinero integration exists, and you can export. For a solo window cleaner it covers.

What Fenster lacks: broad integration — Billy and e-conomic are limited or missing, MobilePay on the invoice (one-tap pay), and automatic invoicing on completion (you still have an invoice tail after the week).

Clientflow has deep two-way integration with Dinero, Billy and e-conomic, plus MobilePay on the invoice. We've written a full article on automatic invoicing for service businesses if that interests you.

What Fenster simply doesn't have

This is the most important section if you're considering switching. It's not that Fenster does these things poorly — they don't exist in the product:

• Lead management. Fenster has no pipeline. When an inquiry comes from your website or Facebook, you copy the data manually — if you check the inbox at all. Window cleaners typically lose 30-50% of leads in the cracks.
• GPS tracking & fleet. You can't see where workers are, and can't give customers precise ETAs. A real gap for customer service and documentation.
• AI route optimization. As mentioned — Fenster's route calculation is manual. AI-based optimization doesn't exist in the product.
• Workflow automation. Reminders, follow-ups, automatic invoice chains — all manual or with external tools.
• Reports & dashboards. Fenster has basic lists. To analyze margins per customer, route performance or worker efficiency, you export and build in Excel.
• Customer portal. Customers can't self-serve booking, see history or pay invoices.
• Multi-trade support. If you expand from window cleaning to cleaning or landscaping, Fenster doesn't follow.

Who Fenster fits — and who not

Fenster is still a fine choice for one type of business: solo or 1-3 employees, recurring subscription customers, static routes, no need for leads/GPS/AI. The classic case is a window cleaner running the same operation for 5 years who just wants a simple tool.

Fenster doesn't fit if you recognize one or more of these: you want leads from website or Facebook, you have 5+ employees, you want to expand into other trades, you need GPS for customer service or documentation, or you want automation so you don't repeat the same manual steps every week.

If you're in the second group, we have a concrete migration guide from Fenster to Clientflow — we move your data for free, typically in 1-2 business days.

Conclusion

Fenster is functionally narrow and deliberately designed that way. Not a critique — a precision. For the right customer it's perfect. For the growing customer it becomes a bottleneck that costs more in time and missed leads than the subscription saves.

Short version: Fenster covers calendar, subscriptions and basic customer registry for solo window cleaners. It doesn't cover leads, GPS, AI route, automation, deep integrations or multi-trade. Not a flaw in Fenster — just the design choice.

To see how Clientflow stacks against Fenster feature-by-feature, it's on the vs page. For prices compared, it's on the Fenster pricing page.

Thanks for reading. If you have questions about Fenster, Clientflow or migration, write directly — I answer every inquiry personally.

— Daniel