What an AngularJS Migration Actually Costs

How much does an AngularJS to Angular migration cost in 2026?

Published industry figures put a full hand rewrite at $500K-plus and 12 to 24 months. Consultancies quote $40K to $150K for a mid-size AngularJS app, on open-ended hourly timelines. Extended-support subscriptions from vendors such as HeroDevs NES and OpenLogic run $25K to $75K per year, indefinitely. Those are the three prices most teams are quoted. A fourth path, fixed-scope pipeline migration, prices by the module instead of the hour.

The width of those ranges is the first thing to notice. A quote spread of $40K–$150K for the same nominal task — "migrate a mid-size app" — means the quoting party cannot see the cost drivers before starting. The spread is not negotiating room. It is uncertainty, and under time-and-materials terms the buyer pays for it.

The table below compares all four paths. A fuller decision framework, including hybrid ngUpgrade and when a rewrite genuinely makes sense, is on the migration options page; the pipeline itself is described on the homepage.

One structural note on the last row: elapsed time matters as much as headline price. Most migration cost is not the invoice — it is the months of running two codebases while the work drags. Compressing the conversion window compresses that hidden cost with it.

What actually drives AngularJS migration cost?

Lines of code is a bad proxy for migration cost. What actually drives effort: artifact count and mix, $scope inheritance depth, dialog and modal count, dynamic $injector usage, custom form engines, and third-party library count. Two apps with identical LOC can differ severalfold in conversion effort because one resolves statically and the other defers its wiring to runtime.

Artifact count and mix. Our reference run — a production AngularJS ERP — was 745 files: 412 controllers, 138 directives, 96 services, 301 templates. Directives cost more per unit than controllers because each one must be re-expressed as a component with typed inputs and outputs; templates cost more than either when they lean on filters and inherited scope. An estimate that quotes on file count alone treats these as interchangeable. They are not.

Scope-inheritance depth. $scope chains are implicit data flow. A controller four levels deep in prototypal inheritance reads and writes state it never declares, and every one of those relationships must be made explicit before the code can compile under strict TypeScript. This is why our engine extracts typed state through graduated L0–L3 typing with freeze and unknown-inference passes — and why deep inheritance is a cost driver no vendor should be quoting without measuring.

Dynamic $injector usage. String-based $injector.get() calls defeat static analysis outright. Our pipeline censuses each one into a residue sentinel, resolves it with an agent plus a verifier, and re-emits the result as a typed static registry; unresolved residue blocks the run rather than vanishing. An app heavy in dynamic injection is measurably more expensive to migrate. A vendor who does not ask about it is pricing blind.

Dialogs, form engines, third-party libraries. Every modal carries its own scope wiring. A custom form engine embeds validation semantics that must survive translation intact. And each third-party AngularJS library needs a maintained modern equivalent, a wrapper, or a replacement decision — a line item per library, invisible in any LOC count.

These drivers are countable. That is the whole argument for measuring them before quoting: a plan preview that inventories artifacts, inheritance depth, and injection sites turns a $110K-wide guess into a bounded number.

Why do time-and-materials migrations run over budget?

Time-and-materials migrations run over because nothing in the pricing model rewards finishing. Revenue accrues by the hour, so ambiguity is billable. Meanwhile the team maintains two codebases in flight, every feature shipped to the old app widens the gap, and when the contractors leave, the migration knowledge leaves with them. The open-ended timelines in published quotes reflect that structure, not the technical difficulty.

The incentive problem is not about bad actors. It is arithmetic. Under hourly billing, every ambiguity discovered mid-project — an undocumented directive, a dynamic injection site, a template nobody can parse — converts to a change order. The party best positioned to estimate the risk is the party paid more when the estimate is wrong. No amount of goodwill fixes a pricing structure that points the other way.

The second overrun engine is the two-codebase window. While migration proceeds, the product does not stop: features ship into the AngularJS app, and each one is new migration scope. A 12-month migration of a moving target is not 12 months of work — it is a race, and hybrid ngUpgrade states have a way of becoming permanent resting points because the race has no finish-line incentive either.

Third: knowledge walks. The contractors who learned your $scope topology leave at handover, and if the project stalls mid-hybrid, the fallback is an extended-support subscription at $25K–$75K per year on top of the sunk cost. The overrun does not just cost more. It converts a project into a rent.

The countermeasure is elapsed-time compression. The reference run converted 745 files in 24 hours elapsed, with 87 of 87 routes render-verified in headless Chrome. At that speed the two-codebase window is effectively closed before feature drift accumulates.

What does fixed-scope pricing per module change?

Fixed-scope pricing by the module inverts the incentive. Scope is bounded by a plan preview computed before conversion starts, so the quote is evidence-based rather than estimated. A declared 65-step pipeline makes per-module effort predictable enough to price as an outcome, and the price includes verification: strict-TypeScript compilation, route render checks, and a flagged-file issue registry.

The plan preview is a computation, not a workshop. From the repository we build the artifact dependency graph, condense cycles with Tarjan strongly-connected-component analysis, and derive a wave-based migration order: cycles co-scheduled, unresolved edges surfaced, order deterministic. You see the shape of the whole job — which modules are cheap, which are entangled, where the risk sits — before anyone converts a file. The quote is written against that preview.

Predictability is what makes fixed pricing rational rather than generous. The pipeline declares 65 steps across 8 lanes; 127 deterministic auto-fix categories run before any model is called; model assistance operates on scoped fragments under a zero-retention agreement and a US/EU-only provider allowlist. The compiler sits in the loop at 3 granularities, from per-artifact tsc checks to whole-project fix sessions with no-regression snapshots. When the process is the same 65 steps every time, per-module cost stops being a guess.

What the fixed price buys is the outcome, verification included. On the reference run: 100 percent of emitted files compile under strict TypeScript, and 87 of 87 routes render in headless Chrome with zero console errors and resolved network calls. A runtime parity harness drives the legacy and migrated apps side by side in dual headless Chrome, behind a mutation firewall so a production sweep cannot write, under an honesty rule that timeouts and backend errors are marked NOT MEASURED — never counted as pass or fail. The migration report page shows the full evidence format.

The same honesty applies to what does not convert. Unconvertible template attributes are reported skipped, never silently converted; unparseable templates are left byte-untouched with a reason; the type engine emits explicit unsupported markers instead of widening to any; and a coverage census degrades the final verdict if any source file is silently dropped. We don't claim turnkey. We start with proof. On the reference run that meant 11 flagged files, and reviewing such a list typically takes a client team half a day.

The engagement itself is short on your side: audit → convert → verify → train your team → hand over, with roughly two hours of your team's time up front. Regulated codebases run in your VPC. The output is plain Angular in a standard CLI workspace — no proprietary runtime, no telemetry, nothing to keep paying for. To scope a module, book the initial conversation or write to chat@softwaremigrationfactory.ai.

What does staying on AngularJS cost?

Staying on AngularJS is not free. Extended support runs $25K to $75K per year at typical published rates, and the spend is rent: it defers the migration without shrinking it. AngularJS reached end-of-life in January 2022. Upstream CVEs are permanent, PCI DSS 4.0 treats end-of-life software as a control failure, and the pool of engineers who will work on AngularJS shrinks every year while the migration gets no cheaper.

The rent compounds. Three years at published extended-support rates is $75K to $225K — and at the end of it you still owe the migration, on a codebase three years further from anyone who understands it. Deferral has a price; it just arrives on a subscription invoice instead of a project budget.

The upstream security ledger is closed. AngularJS end-of-life was announced on December 31, 2021 and took effect in January 2022, and no patch is coming for any of the following — every entry is permanent by design.

For payment-adjacent systems the ledger is not academic: PCI DSS 4.0 treats end-of-life software as a control failure, which turns an engineering backlog item into an audit finding. And the hiring market moves one direction — every year, fewer engineers will take a job maintaining AngularJS, and they cost more. The full timeline and its consequences are on the end-of-life page.

The honest comparison is therefore not "migration versus nothing." It is migration now, at a bounded and evidenced price, versus migration later plus every year of rent, CVE exposure, and audit friction in between.

What else do buyers ask about migration pricing?

How do I get a price for my app?

Book the initial conversation at calendly.com/shahulscalendar/initial-conversation or write to chat@softwaremigrationfactory.ai. The engagement asks for roughly two hours of your team's time up front. From repository access we compute a plan preview: the artifact inventory, the dependency waves, and the flagged risks. The fixed per-module quote is written against that preview, not against an hourly estimate.

What does a unit trial involve?

A unit trial scopes one module and runs it through the full pipeline: analysis, conversion, compilation under strict TypeScript, and render verification in headless Chrome. It ends in the same evidence report a full engagement produces, so you judge output before committing to scope. Commercial terms for the trial and the engagement are set in the initial conversation.

Why don't you publish prices?

Because scope varies more by module complexity than by app size, a published rate card would be either padded or wrong. The plan preview computed before conversion starts makes each quote evidence-based: you can see the artifact counts and dependency waves the price is derived from. The industry ranges cited on this page are published third-party figures, not ours.

Does the fixed price include verification?

Yes. A module is not done until it compiles under strict TypeScript, its routes render in headless Chrome with zero console errors, and every skipped or flagged item appears in the issue registry with a file, a reason, and a suggested owner. The verification report is part of the deliverable, not an add-on.