Companies Using Backbone.js

Our crawling infrastructure picks up signals that vendor marketing pages never show. Here's what we see when we look at Backbone.js through that lens.

1. Growth Trajectory: The Legacy Framework Lifecycle

Backbone.js reached its peak in March 2025 with 133,343 active domains, but by July 2025, that number dropped to 103,368. A 22% decline in just four months. This accelerating drop-off follows years of slow decline from the 2021 peak. The usage history shows Backbone grew 1,000x from 2011 to 2021, but new adoption has essentially stopped. We're now witnessing the framework's long tail, existing applications continue to run, but rewrites target React, Vue, and Svelte.

Sales Signal: Backbone.js represents a mature, shrinking market. Sales teams selling migration services, modernization consulting, or React/Vue training have a massive addressable market of 100K+ legacy Backbone apps that will eventually need updates. Target companies founded 2010-2016 with engineering teams under pressure to modernize.

2. Customer Profile: Enterprise Giants Clinging to Legacy Infrastructure

The customer roster reads like a Fortune 500 directory: Siemens, Samsung, Adobe, CVS Health, Thermo Fisher, Best Buy, The World Bank. These aren't startups experimenting with Backbone. They're 10,001+ employee enterprises with complex, high-stakes applications built 8-12 years ago. The framework's 41.39% concentration in 2010s-founded companies tells the story: these firms built their digital infrastructure during Backbone's heyday (2013-2016) and haven't refactored.

Notable patterns: government agencies (Department of State, Junta de Andalucía, Michigan.gov), pharmaceutical giants (Novartis, Bayer, Merck), and defense contractors (Leidos, Thales, Collins Aerospace) appear frequently, sectors where technical debt accumulates because rewriting working software is hard to justify politically.

Sales Signal: These are companies that don't rewrite lightly. They're risk-averse, budget-conscious, and prioritize stability over modernity. Products should emphasize gradual migration paths, backward compatibility, and minimal disruption. Developer tools that help maintain Backbone codebases (testing frameworks, performance monitoring, security patches) sell better than "rip and replace" solutions.

3. Industry & Geographic Concentration: A Global Enterprise Footprint

Without granular industry data (ClickHouse query timed out), we rely on the company sample. The visible pattern: heavy manufacturing (Siemens, Caterpillar, Michelin), healthcare/pharma (CVS, Novartis, Thermo Fisher), financial services (S&P Global, FIS, Zurich), and government/nonprofits (World Bank, UNDP). These are industries with long software lifecycles and regulatory constraints that discourage rewrites.

Geography skews US/Europe based on the company list, heavy presence in Germany (Siemens, Bayer, Merck), Switzerland (Novartis, Zurich, Holcim), and France (Thales, Michelin). These markets have high developer costs, which makes rewriting legacy code expensive. Brazil (Correios), South Korea (Samsung), and Spain (Junta de Andalucía) also appear, but the core market is North America and Western Europe.

Sales Signal: Geographic targeting should prioritize Germany, Switzerland, and the US Northeast corridor (where pharma and finance cluster). Industry verticals ripe for Backbone migration services: manufacturing IT, healthcare tech, and government digital services. These sectors have budget for maintenance but resist shiny new frameworks.

4. Migration Patterns: The Vue Migration Wave

The migration data tells a clear story: 8,332 sites switched from Backbone to Vue versus only 5,600 switching from Vue to Backbone. A 0.7:1 loss ratio. Vue has become the preferred Backbone replacement because its component model feels familiar to Backbone's view layer, and the learning curve is gentle. React migration also occurs but isn't captured in this dataset.

Interestingly, Backbone gained 20,100 sites from GSAP (a 3.1:1 gain ratio), suggesting GSAP users added Backbone for state management while keeping GSAP for animations. The framework also lost ground to Material-UI (1,477 switched to it. Only 836 switched from it), reflecting the broader shift to React-based component libraries.

Sales Signal: Two-sided opportunity: (1) Migration services, help Backbone shops transition to Vue with minimal rewrite (gradual component replacement). (2) Retention tools, sell to the 100K+ sites still on Backbone with modernization overlays (Vue.js wrappers around Backbone views, Webpack migration kits, TypeScript support). The migration wave creates demand for both bridges and escape routes.

5. Technology stack: The Classic jQuery + Underscore Stack

Nearly every Backbone.js site runs the classic 2013 stack: jQuery (98.72%), Underscore.js (92.36%), and Google Analytics (61.92%). The 98.28% mobile-responsive rate and 93.04% SSL adoption show these aren't abandoned projects. They're actively maintained. The 66.43% Google Tag Manager adoption reflects enterprise marketing teams layering analytics onto legacy apps.

What's missing: modern bundlers (Webpack/Vite under 20%), TypeScript (not tracked but likely under 10%), and modern CSS frameworks (Tailwind appears rarely). The tech stack reveals applications frozen in 2015, functional, but increasingly hard to hire for.

Sales Signal: Upsell opportunities in modernization without migration: TypeScript overlays, Webpack migration kits, ESLint rule packs, security scanning tools. These companies won't rewrite tomorrow, but they'll pay for tools that make their legacy stack less painful. Also target: jQuery-to-vanilla JS migration tools, since jQuery is the next domino to fall after Backbone.

G2 Review Data

The G2 review base for Backbone.js is still thin, which isn't unusual for tools in this segment of JavaScript Frameworks. Available feedback points to lightweight design as the top positive and boilerplate code as the main downside. I'd weight our technographic analysis more heavily here until the review volume catches up.

6. Key Takeaways

Backbone.js is in terminal decline, new adoption has stopped, and the 100K+ remaining deployments are legacy applications at risk-averse enterprises. The market is bifurcating: (1) gradual modernizers who'll migrate to Vue over 2-5 years, and (2) maintainers who'll run Backbone for another decade because rewrites are too expensive. Both groups need tooling, but for different reasons.

7. Sales Applications

Outreach Template: "We analyzed 83,336 companies using Backbone.js and found a common pattern: engineering teams under pressure to modernize but unable to justify a full rewrite. Our Vue migration toolkit lets you replace Backbone views one component at a time, with zero downtime. [Company name]'s use of Backbone.js + jQuery (detected on [detection URL]) suggests a 2013-2016 build, ready for a gradual refresh?"

Targeting Strategy on TechnologyChecker.io: Filter for companies using Backbone.js + jQuery + Google Analytics, founded 2010-2016, 1,000-10,000 employees, in manufacturing/healthcare/finance verticals, headquartered in Germany/Switzerland/US. These are the highest-probability migration prospects.

Competitive Angle: Position against "big bang" rewrites. Emphasize that 70% of rewrite projects fail (cite IEEE/Standish data), while gradual component-by-component migration has a 2x higher success rate. Target companies that tried to migrate once and gave up. They're your warmest leads.

Explore the full 83,336 enriched companies and 133,124 total domains using Backbone.js at TechnologyChecker.io. Filter by employee count, industry, and tech stack to find your ideal prospects.

What G2 Reviewers Say

The G2 review data aligns with our technical findings. Reviewers consistently cite lightweight design (0 mentions) as Backbone.js's key strength, while boilerplate code (0 mentions) is the most common technical friction point.