What G Wave does

G Wave (株式会社ジーウェイブ) is a privately held Japanese software company founded in 2003 and headquartered in Makuhari Technogarden, Chiba City. The firm develops and operates open source-based reservation and management systems primarily for Japanese local government agencies, with secondary deployment into consumer services and medical/dental clinics. Its product portfolio is anchored by OpenReaf, Japan's first open-source public facility reservation system (GPLv2, in market since 2008) and deployed across 100+ municipalities, complemented by cesami and progrec for MyNumber Card delivery reservations and progress tracking, OREAB for event/course registration, SURPH for cloud-native internet reservations with ISMS-certified security and electronic payments, CLOVER for nursing care facility bookings, and Progrec as a general progress management system. Technical foundations include PostgreSQL/MySQL database support, cloud-native architecture on Sakura Internet's Sakura Cloud (10-year platform relationship with documented stability), and integrations with NTT Com Online's SMS service and GMO Payment Gateway for electronic payments.

The company operates three business lines: open source system development and operation, web production, and collaborative research with universities and government grant programs. GTM is hybrid: direct sales to large municipalities combined with a regional IT vendor channel (including Chibagin Computer Service) for smaller local government accounts. Revenue is generated through a freemium model (free OSS software, paid support and customization), monthly cloud subscriptions for hosted versions of OpenReaf, OREAB, SURPH and others, and one-time professional services for system construction, customization, and maintenance. Five products (OpenReaf, OREAB, cesami, CLOVER, Progrec) are recognized as IT introduction subsidy eligible tools, allowing customers to recover up to two-thirds of costs (maximum ¥1M). The company holds the ASPIC IoT AI Cloud Award 2022 Social Contribution Award and is led by founder/President Yoshiyuki Yoshida (former NTT researcher) with external director Mitsuyuki Chiba (former 12-year Mayor of Ichikawa City) providing public-sector governance perspective.

Name

G Wave

Legal name

株式会社ジーウェイブ

Website

https://ziwave.com

Company type

Private

Founded year

2003

Operating status

Operating

Short description

G Wave is a Japanese open source software firm developing reservation and management systems (OpenReaf, cesami, SURPH, OREAB, progrec, CLOVER) primarily for local government agencies across Japan, with 100+ municipal implementations and cloud deployment on Sakura Cloud.

Ownership category

akta.pro rank

Product category

Government Reservation and Reception Software

NAICS

Computing Infrastructure Providers, Data Processing, Web Hosting, and Related Services (518210)

SIC

Services-Computer Programming, Data Processing, Etc. (7370)

akta.pro primary industry

Destination & Venue Reservation Systems (DMO/MICE) (THALADAI)

akta.pro secondary industry

Tour/Activities/Attractions Reservation Systems (THALADAG)

Keywords

• Public facility reservation software
• Government reservation systems
• Open source municipal software
• Event reception systems
• My-Number card delivery software

Headquarters

HQ city

Chiba

HQ country

Japan

HQ region

Asia

Offices1 record

Markets served

GTM type

B2B

Offering type

Software

Cost components

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

Revenue model

1. Cloud Service Subscription: Monthly subscription fees for hosted cloud services including OpenReaf cloud service, OREAB cloud service, and other reservation management systems deployed on Sakura Cloud.
2. Open Source Software (Free): OpenReaf software provided free under company license (GPLv2 for OSS version). Revenue generated from paid support, customization, and cloud hosting services rather than software licensing.
3. System Construction and Customization: One-time fees for initial system setup, customization, staff training, and ongoing system maintenance and support services.
4. SURPH Premium Features: Enhanced internet reservation system with advanced security features (ISMS certified, e-Government encryption) targeting medical/dental clinics and high-security businesses, offered as subscription cloud service.

Pricing tiers

Go-to-market motion2 records

Distribution channels3 records

Marketing channels5 records

Core offering

G Wave develops and sells open-source-based reservation, reception, and progress-management software primarily for Japanese local government agencies. Its product suite addresses public-facility reservations, event receptions, My-Number card distribution scheduling, nursing care facility reservations, and cremation facility reservations. The company also provides web production and IT consulting services to support municipal digital transformation.

Product overview

G Wave operates as a public-sector focused software company offering a suite of interconnected reservation and management systems primarily serving Japanese local governments. The core product portfolio centers on OpenReaf as the flagship public facility reservation system (Japan's first open-source system in this category), complemented by specialized government-focused solutions including cesami for My Number Card delivery reservations, progrec for card delivery progress tracking, and OREAB for event/course registrations. The company also offers SURPH as a commercial-grade internet reservation platform with enhanced security features, and CLOVER for nursing care facility reservations. All products support cloud deployment and are distributed in multiple licensing models including open source, package, and SaaS formats.

Differentiator

Problem solved

Functional benefit

Brands

• OpenReaf（オープンリーフ）: 公共施設予約システム - 様々な施設の予約受付・管理・収納を行うことができるインターネットシステム
• OREAB（オリーブ）
• cesami（セサミ）
• progrec（プログレック）
• SURPH（サーフ）
• CLOVER（クローバー）

Products and services

• OpenReaf (オープンリーフ)

Quantifiable outcome

• 100+ implementations across Japanese municipalities, establishing market presence in government sector
• +2 more outcomes

Named customers12 records

Segments4 records

Ideal customer profiles1 record

Technology focussed Yes

API detail

Has API

Yes

API docs

API detail

Core technology

AI maturity

App detail

Integration4 records

Feature5 records

Partnerships

Seven partnerships are on record, tiered core and minor.

• さくらインターネット (Sakura Internet)coreTechnology or Integration · 17 July 2025Sakura Internet provides the cloud infrastructure platform (Sakura Cloud) for G Wave's services. G Wave has been using Sakura Cloud as their platform for approximately 10 years with stable operation and minimal server downtime. Their public facility reservation system OpenReaf is featured as a case study on Sakura Internet's website.
• NTTコミュニケーションズ (NTT Com Online)coreTechnology or Integration · 7 May 2024NTT Com Online's SMS sending service '空電プッシュ' (Karaden Push) was integrated into OpenReaf, enabling SMS notifications for reservations and appointment reminders. OpenReaf was featured as an introduction case for this SMS service.
• 東京大学 高齢社会総合研究機構 (University of Tokyo Institute for Gerontology)minorStrategic or Co-development PartnerCollaborative research in elderly welfare and home care services, contributing to G Wave's research capabilities in aging society solutions.
• 電気通信大学 (The University of Electro-Communications)minorStrategic or Co-development PartnerJoint research on BOP (Base of Pyramid) targeted internet cache systems and open source software research since 2010.
• NTT情報流通プラットフォーム研究所 (NTT Information Network Research Institute)minorStrategic or Co-development PartnerCollaborative research on large-scale cloud service monitoring technology development.
• 情報通信研究機構NICT (National Institute of Information and Communications Technology)minorStrategic or Co-development PartnerG Wave participated in an Ministry of Internal Affairs and Communications IoT service creation support project, using NICT's testbed for data analysis in healthcare service quality improvement research. Also collaborated on shopping mall UWB positioning service demonstration.
• ちばぎんコンピューターサービス (Chibagin Computer Service)minorChannel Partner/ Reseller/ DistributorListed as a major business partner in the company profile, providing regional sales and service support.

Scale indicators4 records

Recent moves6 records

Expansion highlights5 records

Broad incumbents

• 日立製作所 (Hitachi): A major Japanese conglomerate with a substantial government and public-sector IT business. Hitachi competes for large-scale municipal and central government IT contracts, including systems adjacent to G Wave's reservation management offerings.
• 富士通 (Fujitsu): One of Japan's largest IT services conglomerates and a major government system integrator. Fujitsu offers broad e-government and public-sector IT solutions that compete with G Wave in larger municipal contracts, though it does not specialize in niche OSS reservation systems.
• NEC (日本電気): A leading Japanese system integrator with extensive local government and e-government business. NEC offers broader public-sector IT portfolios and competes with G Wave for larger municipal digital transformation contracts.
• BIPROGY株式会社 (BIPROGY): Formerly Nihon Unisys, a Japanese IT services firm with a long-standing public-sector and local government business. BIPROGY offers comprehensive municipal IT solutions that compete with G Wave for larger government accounts.
• NTTデータ (NTT Data): Japan's largest IT services company and a core government system integrator with deep municipal relationships. As a broad incumbent, NTT Data offers public-sector solutions that overlap with G Wave's market, particularly for larger enterprise-grade deployments.
• TIS株式会社 (TIS Inc.): A mid-sized Japanese IT services company serving financial, public, and corporate sectors. TIS operates adjacent to G Wave in Japanese government IT services and represents the kind of larger competitor that could encroach on G Wave's niche.

Direct peers

• ワイズノット (Wiseknot): A Japanese software vendor focused on public facility reservation systems for local governments. Closest direct peer to G Wave's OpenReaf, competing in the same niche with similar OSS-influenced positioning and municipal customer base in Japan.

Others

• さくらインターネット (Sakura Internet): Japanese cloud infrastructure provider (Sakura Cloud) that has hosted G Wave's services for approximately 10 years. While primarily a partner/infrastructure provider, Sakura Internet's cloud platform represents the underlying technology enabling G Wave's SaaS delivery model.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat6 records

Key risks7 records

Key highlights2 records

Customer concentration

Compliance2 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 records

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 G Wave