Zumi Studios

What Zumi Studios does

Zumi Studios is an independent, privately-held software studio that develops and distributes consumer-facing applications directly through self-owned web properties. Its portfolio includes three apps: Bullet Memo (a note-taking application), Hazumi News (an iOS news aggregation app that fetches, parses, caches, and summarizes Hacker News content on a recurring schedule with push notifications for subscribers), and Metafast (an app managed by Zumi Studios with undocumented functionality).

The studio is operated by James O'Reilly, who functions as a solo developer building side projects. The primary development stack is Ruby on Rails for backend services and Swift for iOS; the founder publicly documented an experiment rewriting Hazumi News' backend in Golang across a microservices architecture (five HTTP-communicating services) before reverting to a Rails monolith after approximately two months due to development velocity concerns. Infrastructure runs on Fly.io with Sidekiq/Redis for asynchronous job orchestration, and monitoring via Grafana.

The business model is direct-to-consumer via self-owned domains (bulletmemo.com, hazumi.news, metafa.st), with no pricing publicly disclosed and no enterprise customers, partnership channels, or institutional funding referenced. Customer segmentation is horizontal and targeted at software developers and technical professionals, supported by a content marketing strategy through a technical blog covering software engineering practices, language choice trade-offs, and developer data privacy concerns. Zumi Studios appears to operate without external investment, parent company, or ownership changes.

Name

Zumi Studios

Legal name

Zumi Studios

Website

https://zumistudios.com

Company type

Private

Operating status

Operating

Headcount range

1–10 employees

Short description

Zumi Studios is an independent, privately-held software studio that builds consumer applications — Bullet Memo, Hazumi News, and Metafast — using Ruby on Rails and Swift, operated by a solo developer and distributed directly via self-owned websites to individual users.

Ownership category

akta.pro rank

GTM type

B2C

Offering type

Software

Cost components

Personnel, Technology or R&D, Infrastructure, Operations, Marketing or Sales

Distribution channels1 record

Marketing channels1 record

Core offering

Zumi Studios is an independent software studio that designs, builds, and operates consumer-facing web and mobile applications. Its portfolio includes Bullet Memo (a note-taking/memo app), Hazumi News (an iOS news application that aggregates and summarizes Hacker News content with push notifications for subscribers), and Metafast. The studio develops primarily in Ruby on Rails for backend services and Swift for iOS, and distributes these products directly through its own websites and the Apple App Store.

Product overview

Zumi Studios is a software company that has developed three consumer-facing applications: Bullet Memo (a note-taking app), Hazumi News (an iOS news aggregation app with push notifications and subscription features), and Metafast. The company maintains a developer blog covering software engineering practices, including discussions on Slack usage, AI training risks, and programming language choices (Rails vs. Golang).

Differentiator

Problem solved

Functional benefit

Products and services

• Bullet Memo A note-taking and memo application built with passion, distributed directly by Zumi Studios via its own website. Intended for individual end users who want a focused personal note tool.
• Hazumi News An iOS news application with backend services that fetch and summarize content from Hacker News on a recurring schedule, delivering push notifications to subscribers. Built with Swift on iOS and Ruby on Rails on the backend, with Sidekiq and Redis for asynchronous job processing. Targets developers and tech-savvy news consumers.
• Metafast An application managed by Zumi Studios and distributed via its own domain (metafa.st). Specific functionality is not detailed in the available sources.

Segments1 record

Ideal customer profiles1 record

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Recent moves4 records

Expansion highlights3 records

Broad incumbents

• Flipboard: Large-scale news aggregation and personalization platform. Adjacent competitor to Hazumi News in the news-consumption space, operating as a broad incumbent with magazine-style curation across many topics.
• Evernote: Established incumbent in consumer note-taking with a wide product portfolio. Overlaps with Bullet Memo in the note-taking category but operates at significantly larger scale as a broad productivity platform rather than an indie utility.

Direct peers

• Bear: Note-taking app for Apple devices by Shiny Frog. Direct competitor to Bullet Memo in the Apple-ecosystem note-taking space with a similar premium, design-forward indie positioning.
• Agile Tortoise: Independent iOS developer behind Pocket Informant and other Apple-platform apps. Comparable as a small indie shop shipping productivity and information tools for Apple users, similar in scale and philosophy to Zumi Studios.
• Iconfactory: Long-running independent Mac and iOS software studio producing consumer apps like Twitterrific and Linea. Comparable as a multi-product, founder-rooted indie studio shipping design-led consumer applications.
• Feedly: News aggregation platform serving professionals and teams. Comparable to Hazumi News as a competitor in the news-reading/aggregation category, though Feedly operates at larger scale with venture funding.
• Tapbots: Small independent iOS app studio behind Tweetbot, Ivory, and Calcbot. Directly comparable as another founder-led, design-focused indie studio shipping consumer iOS applications without external funding at small headcount.
• Obsidian: Knowledge-base and note-taking application built by a small team around Eric Shans. Comparable to Bullet Memo as a consumer note-taking product that grew from indie origins and now serves technical professionals.
• NetNewsWire: Open-source RSS news reader for iOS and macOS maintained by Brent Simmons, an individual developer. Closely comparable to Hazumi News as a solo-built, developer-focused news consumption app with a similar philosophy of long-term maintainability.
• Reeder: Premium iOS/macOS RSS reader by Silvio Rizzi. Directly comparable as a paid, indie-built news aggregation app targeting the same technical-user persona that Hazumi News serves.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat3 records

Key risks6 records

Key highlights6 records

Customer concentration

• LinkedInlinkedin.com/company/zumistudios

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Zumi Studios