Three parts of this series dissected three pricing models: credits (Copilot Studio), seat licenses (Microsoft 365 Copilot) and consumption meters (Azure AI Foundry). All three share one property: the costs keep running as long as the solution runs. Replit Agents invert that logic: the biggest cost block occurs once — at build time. After that, the solution runs for a fraction of what every other model charges.

This final part works out, with list prices verified in August 2026, what a solution built with the Replit Agent and hosted on Replit costs at 100, 500 and 1,000+ users — and then draws the overall comparison across all four platforms.

Note: All prices are USD list prices (as of August 2026) from the official Replit pricing pages and documentation. CHF amounts are rounded conversions (1 USD ≈ 0.80 CHF).

The component inventory: what a Replit solution needs

Two things stand out. First: there is no per-user cost. Whether 100 or 1,000 people use the app changes nothing about the subscription — only hosting and any AI calls scale along. Second: Agent build costs are effort-based — simple tweaks cost cents, full features are bundled into checkpoints. From our project practice: an agentic MVP typically lands at $200–800 of Agent usage, a full-grown internal solution at $500–1,500 — plus the implementation partner's design and quality-assurance effort.

AIOnomics: when the formula collapses into a one-time payment

The series formula — Monthly cost = users × queries/user × units/query × price/unit — applies at Replit only to the smallest cost block: the optional in-app AI calls. Hosting is a fixed base, the subscription a constant, and the biggest item — the build — has vanished from the monthly bill entirely. It becomes an amortization calculation: one-time cost divided by months of use.

The animation shows how the one-time build cost amortizes against the perpetual license cost of the other models:

A worked example: an internal knowledge app costs CHF 8,000 one-off (build incl. Agent usage and partner effort) and CHF 60/month to run. Microsoft 365 Copilot for the same 100 users costs CHF 2,400/month. The Replit solution is cheaper after four months — and CHF 2,300 cheaper every month from then on.

Baseline 1: 100 users

Assumptions: internal knowledge app with an AI feature, 30 queries per user per month (3,000 queries at ~$0.01 — lean prompt, 2,000 input / 500 output tokens, GPT-5), small reserved VM, Core subscription.

Plus one-off: build ~CHF 5,000–12,000 (depending on scope). Spread over 24 months that is CHF 210–500/month — even including amortization, the solution stays below a quarter of the M365 Copilot license cost for the same user count.

Baseline 2: 500 users

15,000 AI queries/month, dedicated VM (1 vCPU/4 GB), growing database.

Baseline 3: 1,000+ users

30,000 AI queries/month, larger VM (2 vCPU/8 GB), more data volume.

CHF 295 per month for 1,000 users is around 30 centimes per head — two orders of magnitude below the seat license. And the lion's share is not Replit but the AI calls; a solution without an LLM feature (a classic business app) runs for under CHF 80/month regardless of user count.

The grand platform comparison: all four models

The series finale in one table — running costs in CHF per user per month, excluding one-time build costs:

The animation shows the comparison across all three user tiers:

And the honest counter-calculation of one-time and staff efforts:

The decision rule

• M365 Copilot when the value is created inside the Office apps themselves and heavy users saturate the license.
• Copilot Studio when the knowledge lives in Microsoft 365 and a standard agent without a development project is enough.
• Azure AI Foundry when hard requirements (custom models, compliance, latency) justify a full stack and a team carries the operations.
• Replit when a tailor-made solution is needed, the user count is large or the budget small — and the solution should run with minimal maintenance after the build.

Five cost levers for Replit solutions

1. Cut the scope tight. The Agent builds effort-based — every feature nobody needs costs checkpoints. A precise briefing saves real money at build time.

2. Autoscale for sporadic usage. Internal tools with few hits run cheaper on Autoscale ($2 base fee plus usage) than on a permanently reserved VM.

3. Reserved VM only at constant load. Switching to a dedicated VM pays off once the app must respond around the clock — before that, you pay reservation for idle time.

4. Model choice for in-app AI. The biggest running item is the LLM calls. A mini model for routine queries cuts the variable bill by 40–70% — the same lever as at Foundry.

5. Use the credits. Core and Pro subscriptions include usage credits equal to the subscription price — small solutions effectively run at the subscription price alone.

Conclusion: the series in one sentence

Four platforms, four pricing logics: credits get consumed, licenses keep running, meters tick per token — and Replit shifts the cost to where it occurs once: the build. If you know your usage patterns, you don't pick the "best" platform — you pick the one with the matching cost curve. That is exactly the calculation we run with our clients before the first line gets built.

How CNEXT can help

• Platform assessment: we run your scenarios across all four models — with current list prices and your real usage figures.
• Agent MVP in days: as a Replit partner, we build your solution with the Replit Agent — from prototype to production.
• Operating model: hosting, monitoring and further development — low-maintenance and with clear cost transparency.

Before you license, we do the math: Get in touch →

Sources (all retrieved August 2026): Replit pricing · Replit deployment pricing · Replit App Storage pricing · Replit Agent billing · Azure OpenAI pricing

Further reading:

• Part 1: What Does a Copilot Studio Agent Really Cost?
• Part 2: What Does Microsoft 365 Copilot Really Cost?
• Part 3: What Does an Azure AI Foundry Agent Really Cost?
• Building a Company Brain: Copilot Studio, Azure AI Foundry or Replit?
• Free Agent MVP