Why can software quotes for the same request differ by several times?

The phrase “build a system” can describe entirely different responsibilities. Price commonly varies with feature and client coverage, design and test depth, migration and integrations, performance and security, transferred source and documents, and post-launch support.

The client only needs to provide the business objective, current process, timing, budget constraints, and representative evidence. Wavesteam turns that into a common scope and quality schedule, explains our assumptions, and—when several suppliers are being compared—provides a neutral version each candidate can complete.

When defining budget, scope, and cost assumptions, also compare Why can one app quote cost ten times another? and How much does a custom app cost?; the linked guidance adds context that should be considered in the same decision.

The comparison should identify:

• included and excluded functions, clients, and interfaces;
• deliverables for prototype, design, engineering, testing, deployment, and store submission;
• ownership and access for source, design files, documentation, accounts, and data;
• cloud, messaging, maps, payments, AI, and other third-party charges;
• change control, warranty, and continuing maintenance pricing;
• milestones, payments, acceptance cases, and evidence.

A low quote is not necessarily a trap. Mature reuse and efficient delivery can legitimately reduce cost. Warning signs are refusal to itemize, migration or testing deferred as “later,” extra charges for source or deployment not disclosed initially, no runnable acceptance milestones, or a deliberately low entry price paired with uncontrolled change fees.

Normalize every proposal to the same scope, quality floor, asset transfer, and service period before comparing total cost and risk. Wavesteam should state when the low-price route is viable, the likely cost after missing work is restored, and signals to stop. If Wavesteam is one of the candidates, the client's procurement team or an independent evaluator makes the final selection; we should not score ourselves as an impartial judge.