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Agency & Consultancy

Callstack vs STX Next

Structured technology and market comparison · 2026

Direct Feature Comparison

Callstack · vs · STX Next
Market Cluster / Sector
CallstackAgency & Consultancy
STX NextAgency & Consultancy
Platform Focus
Callstack

Enterprise React Native engineering and AI delivery services.

STX Next

Software engineering consultancy for cloud, data and AI transformation.

Company Size
Callstack201–500 employees
STX Next501–1,000 employees
Headquarters
CallstackPL
STX NextPL
Year Founded
Callstack2016
STX Next2005
Dossier & Alternatives

Analyze all overlapping signals and tech stacks for Callstack and STX Next

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Comparison Analysis

What is the main difference between Callstack and STX Next?

When comparing Callstack and STX Next, both platforms operate within the Agency & Consultancy ecosystem. Callstack is positioned as Enterprise React Native engineering and AI delivery services, whereas STX Next focuses on Software engineering consultancy for cloud, data and AI transformation. Decision-makers evaluate both solutions when orchestrating their commercial monetization and technology stack.

What are the top alternatives to Callstack and STX Next?

When evaluating Callstack and STX Next, enterprise buyers also consider other platforms in Agency & Consultancy. You can discover the full competitive landscape and evaluate other alternatives by viewing their respective footprint profiles on Polaris7.

How do the corporate scale, structure, and headquarters of Callstack and STX Next compare?

Callstack is headquartered in PL (founded in 2016) with 201–500 employees. STX Next is based in PL (founded in 2005) with 501–1,000 employees. Complete ownership, subsidiary trees, and corporate affiliations are documented across Polaris7.

Market Signals

Recent Market Signals & Activity: Callstack vs STX Next

Documented market movements, strategic partnerships, product releases, and regulatory developments mapped across Polaris7.

CA

Callstack

Recent Signals

  • ·Callstack

    Apex Is Now Generally Available: Agentic Coding Model for Mobile and Web, Specialized in React

    Apex is now publicly available. Built by Callstack, it brings React Native expertise to feature development, code reviews, debugging, and testing, with strong performance on Next.js tasks too.

  • ·Trending TopicsInfrastructure

    Callstack Acquires Margelo for Over $20M

    Polish software company Callstack is acquiring Vienna-based engineering firm Margelo in a deal valuing the latter at more than €20 million. Both companies specialize in React Native, a cross-platform framework for building mobile apps. Margelo is known for its open-source libraries (VisionCamera, react-native-mmkv, Nitro Modules) and contract development for clients like Discord, Coinbase, and Expensify. Callstack, founded in 2016, employs over 200 people and serves enterprise clients. The acquisition aims to expand Callstack's technology portfolio and support international growth. Founder Marc Rousavy will stay on and retain a significant stake. The deal follows a recent growth investment from Viking Global Investors that valued Callstack at around €120 million.

    • Callstack is acquiring Margelo for a valuation exceeding €20 million.
    • Margelo is known for open-source React Native libraries with over 420 million total npm downloads.
    • Marc Rousavy will remain with the combined company as a significant shareholder.
  • ·Trending TopicsM&A

    Polish Callstack Acquires Vienna-Based React Native Firm Margelo

    Polish software consultancy Callstack has acquired Vienna-based engineering firm Margelo in a transaction valuing Margelo at more than €20 million. Margelo is known for open-source React Native libraries such as Nitro Modules, VisionCamera, and react-native-mmkv, and lists Discord, Coinbase, Expensify, and VSCO as clients. Callstack, founded in 2016 in Wrocław, employs more than 200 people and serves over 100 enterprise customers. Margelo founder Marc Rousavy will remain on board and continue developing the libraries. The companies say AI is shifting software development toward architecture, performance, and secure releases. Callstack previously received a growth investment from Viking Global Investors in summer 2025, which valued the company at roughly €120 million. No closing date or regulatory approval details were disclosed.

    • Callstack is acquiring Margelo, valuing the Vienna-based firm at over €20 million.
    • Margelo's open-source libraries include Nitro Modules, VisionCamera, and react-native-mmkv.
    • Margelo has about 39 senior developers and lists Discord, Coinbase, Expensify, and VSCO as clients.
View all signals for Callstack →
ST

STX Next

Recent Signals

  • ·STX Next

    STX Next Publishes New Blog Posts on RAG Architecture and AI-Powered Prototyping

    New blog posts added: 'How to Choose the Right RAG Architecture for Enterprise AI' (September 18, 2026) and 'How AI-Powered Prototyping Protects Development Budgets in Data Product Delivery' (September 18, 2026). Also updated: 'Top 10 AI Development Companies for Insurance in Europe [2026]' (September 8, 2026) and 'Logo Detection for Sports Video' (September 1, 2026).

View all signals for STX Next →

Compare their exact ecosystem overlaps.

Explore all deep relationships in Polaris7. Discover exactly which mutual clients, integrated technologies, and overlapping partners Callstack and STX Next share across the market ecosystem.

Start for freeCallstack ProfileSTX Next Profile